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ABOUT THIS REFERENCE CARD: The operational features of your modem can be accessed through direct commands as well as through the menus of full-featured communications software like Hayes Smartcom II and Smartcom III. For those users whose applications require instructions be given to the modem directly, the various sections of this card list the AT Commands that can be issued to control the modem, the S-Registers that can be used to further configure it, and the Result Codes the modem returns in response to commands and call progress monitoring. This card also includes a chart outlining the modem-to-DTE cabling requirements for optimum use of the modem in all its operating modes. The V-series System Product User's Reference provides general suggestions for using command and register options to configure a V-series system product to be used with a particular computer and software. This card is the primary reference for the AT Commands, Result Codes, and S-Registers supported by your modem. For information on using the modem in V.25bis command mode, see the CCITT V.25bis Reference Card. WHEN TO USE AT COMMANDS: Aside from selected AT Commands in a setup or initialization string within your software, most communications software does not require modem control with commands. Note that the use of AT Commands is not a substitute for the features provided by commercial software. On-line activities must be performed by software; no AT Commands are available, for example, for file transfers between connected systems. IMPORTANT: To use the modem, even with AT Commands, communications software or some program that performs "terminal emulation" is required. Commands cannot be issued from your computer's operating system prompt. COMMAND FORMAT: AT commands are issued from the modem's command state in the following format. Command Prefix - AT The AT prefixes the command line to get the modem's attention, detect the speed at which the computer is sending information to the serial port, and recognize the character format (way the information is structured). Commands and Parameters: The command tells the modem what action to take. AT Commands are either a single letter or a letter preceded by an ampersand(&). For example, the Q command determines whether the modem returns result codes in response to commands, and the &D command controls the modem's use of the DTR signal. The parameter (0,1,2,etc.) follows a command to tell the modem which option to use. If a parameter is not specified, the modem assumes the 0 (zero) option. For example, E is the same as E0. Several commands can be issued on a single line as long as it does not exceed 255 characters. Although Q1 is one command, it counts as two characters in the command line. End of Line Character: The <--- terminates the command line and sends the instructions from the computer to the modem. The particular character used to perform this function on your keyboard might be the Return key or the Enter key. Escape Sequence - +++ The escape sequence returns the modem to the command state from the on-line state. The escape sequence is issued on a line by itself and is sent without the AT prefix and the <--- command line terminator. The escape sequence includes a guard time bracketing the three characters. Both the character used and the duration of the guard time can be changed, if desired, by writing to S-Registers 2 and 12, respectively. ISSUING AT COMMANDS: When the modem powers up, it enters the "command state," ready to accept instructions (unless command recognition has been disabled by "dumb mode" configuration). The modem also enters the command state when a connection is broken. When you use the D or A commands to make a connection, the modem enters the "on-line state". Anything you type is sent to the modem and computer on the other end of the line when the modem is in the on-line state. To enter commands while still connected to another modem, issue the escape sequence (+++). The modem will enter the command state, ready to accept commands. When you are ready to go on-line again, simply issue the OO command. AT COMMAND SUMMARY: V-series ULTRA Smartmodem 9600 supports the AT Commands listed on this card. If you issue an AT Command not included in this listing, the modem will return an ERROR result code. Always precede the command option with the AT prefix and end the line with <--- (except when issuing A/ and +++). The most frequently used command is the D command and its dial modifiers (see below). The D command causes the modem to originate a telephone call and the dial modifiers initiate the desired features. For example, AT DT9 W 555-2369 <--- instructs the modem to dial in the following way. The modem dials the access code 9 using the tone method (T), waits for a second dial tone (W), then dials the specified number (555-2368). The modem waits for a carrier tone from the modem at the other end of the line. If no carrier is detected within a given time (see S-Register 7; factory setting is 50 seconds), the modem automatically releases the line and sends the result code NO CARRIER. If a carrier signal is detected, the modem sends the result code CONNECT and goes on-line, thereby permitting communication with the remote modem. Command options listed in bold type are those preselected in memory as part of the modem's factory configuration. These options are referred to as factory settings. COMMAND DESCRIPTION ------- ------------ A Enter answer mode; go off hook, attempt to answer incoming call, and go on-line with another modem A/ Re-execute previous command line; not preceded by AT nor followed by <--- BO Initiate calls using V.22 at 1200 bps B1 Initiate calls using 212A at 1200 bps B2 If originating a call using V.23, transmit at 75 bps and receive at 1200 bps. If answering and NO selected, transmit at 1200 bps and receive at 75 bps. B3 If originating a call using V.23, transmit at 1200 bps and receive at 75 bps. If answering and NO selected, transmit at 75 bps and receive at 1200 bps. B15 Initiate calls using V.21 at 300 bps B16 Initiate calls using 103 at 300 bps B41 Initiate a call using V.32 at 4800 bps B42 Initiate a call using ping pong (half duplex) at 4800 bps B60 Initiate a call using V.32 at 9600 bps B61 Initiate a call using ping pong (half duplex) at 9600 bps D Enter originate mode; go off hook and attempt to go on-line with another modem MODIFIER DESCRIPTION -------- ----------- 0-9*#ABCD Specifies letters, numbers, and symbols the modem will use when dialing T Dials using Tone method P Dials using Pulse method ' Pauses before continuing W Waits for second dial tone @ Waits for quiet answer ! Issues timed break recall (flash) R Places call in reverse mode (to call an originate-only modem) ; Returns to command state after dialing and maintains the connection S=n Dials phone number n (0-3) stored with &Zn=x COMMAND DESCRIPTION ------- ----------- E0 Do not echo characters from the keyboard to the screen in command state E1 Echo characters from the keyboard to the screen in command state H0 Hang up and place modem in command state H1 Go off hook and operate auxiliary relay I0 Display product code (3-digit number) I1 Calculate ROM checksum (3-digit number) I2 Verify ROM checksum of modem (OK or ERROR) L0-L1 Set low speaker volume L2 Set medium speaker volume L3 Set high speaker volume M0 Turn speaker off M1 Turn speaker on until carrier detected M2 Turn speaker on M3 Turn speaker on until carrier detected, except during dialing N0 When originating or answering, handshake only at speed specified by S37 N1 When originating, permit negotiation of a common communication standard at highest associated line speed supported by both modems. Begin negotiations from the DCE line speed specified in S37, falling back to a lower speed if necessary. When answering, fall back from V.32 or V.32 ping pong (half duplex) to V.22/212A/V.22bis, then V.21/103 N2 When originating, permit negotiation of a common communication standard at highest associated line speed supported by both modems. Begin negotiations from the DCE line speed specified in S37, falling back to a lower speed if necessary. When answering, fall back from V.32 or V.32 ping pong (half duplex) to V.22/212A/V.22bis, then V.23/V.21/103 COMMAND DESCRIPTION ------- ----------- N3 When originating, handshake only at speed specified by S37. When answering, fall back from V.32 or V.32 ping pong (half duplex) to V.22/212A/V.22bis, then V.21/103 N4 When originating, handshake only at speed specified by S37. When answering, fall back from V.32 or V.32 ping pong (half duplex) to V.22/212A/V.22bis, then V.23/V.21/103 N5 When originating, permit negotiation of a common communication standard at highest associated line speed supported by both modems. Begin negotiations from DCE line speed specified in S37, falling back to a lower speed if necessary. When answer- ing, handshake only at speed specified by S37 O0 Go to on-line state O1 Go to on-line state, initiate retrain Q0 Return result codes Q1 Do not return result codes Q2 Return result codes in originate mode, do not return result codes in answer mode Sr? Read and respond with current value of register r (r=number of register; ? requests value) Sr=n Set the value of register r to n (n=value within range of register r) V0 Display result codes as numbers V1 Display result codes as words W0 Do not return negotiation progress messages W1 Return negotiation progress messages W2 Do not return negotiation progress messages; return CONNECT messages using modem-to-modem (DCE) speeds instead of modem- to-DTE speeds X0 Provide basic call progress features to enable connection, no carrier, and ring detection X1 Provide basic call progress features and connection speed with appropriate result codes X2 Provide basic call progress features, connection speed, and dial tone detection X3 Provide basic call progress features, connection speed, and busy signal detection X4 Provide basic call progress features, connection speed, busy signal and dial tone detection Y0 Do not respond to longspace disconnect Y1 Respond to longspace disconnect Z0 Reset and recall stored user profile 0 Z1 Reset and recall stored user profile 1 &C0 Presume presence of carrier detect signal &C1 Track the status of carrier detect signal &C2 Presume presence of carrier detect signal until on-line, then track status of signal &D0 Ignore the status of DTR signal &D1 Monitor DTR signal. When an on-to-off transition of DTR signal occurs, the modem enters command state. Return to the on-line state (if the connection has not been broken) when the 00 command is issued. &D2 Monitor DTR signal. When an on-to-off transition of DTR signal occurs, hang up and enter the command state &D3 Monitor DTR signal. When an on-to-off transition of DTR signal occurs, hang up and perform a reset &F Recall factory configuration as active configuration &G0 Use no guard tones &G2 Use 1800 Hz guard tones &J0 Configure for RJ-11, RJ-41S, RJ-45S telco jacks &J1 Configure for RJ-12, RJ-13 telco jacks FOR JACK SETTING WHEN CONFIGURED FOR MI/MIC OPERATION, SEE REGISTER S-92 &K0 Disable local flow control &K1 Enable RTS/CTS local flow control &K2 Enable XON/XOFF local flow control &K3 Enable RTS/CTS local flow control &K4 Enable XON/XOFF local flow control &K5 Enable transparent XON/XOFF local flow control &L0 Configure for dial-up operation L1 Configure for private speechband circuit (conditioned leased line) operation &On Enter X.25 PAD command state of channel n (0-3) from AT command state; if a parameter is not specified, the modem will return to the command state of the channel last selected &Q0 Communicate in asynchronous mode &Q1 Communicate in synchronous mode 1 - Async-to-Sync &Q2 Communicate in synchronous mode 2 - Stored Number Dial &Q3 Communicate in synchronous mode 3 - Voice/Data Switch &Q4 Communicate in synchronous mode 4 - Hayes AutoSync &Q5 Communicate in error-control mode &Q6 Communicate in asynchronous mode with automatic speed buffering - for interfaces requiring constant speed between the DTE (computer/terminal) and the DCE (modem) &R0 Track CTS according to RTS &R1 Ignore RTS; assume presence of CTS &S0 Assert DSR signal always &S1 Assert DSR signal prior to handshake operation &S2 Assert DSR signal after handshake negotiation, but before CONNECT XXXXX result code sent to DTE &T0 Terminate test in progress &T1 Initiate local analog loopback &T3 Initiate local digital loopback &T4 Grant request from remote modem for remote digital loopback &T5 Deny request from remote modem for remote digital loopback &T6 Initiate remote digital loopback &T7 Initiate remote digital loopback with self test &T8 Initiate local analog loopback with self test The &T commands must be entered when the modem is configured for &Q0. &U0 Enable trellis coding (V.32 9600 bps only) &U1 Disable trellis coding &V View active configuration, user profiles, and stored telephone numbers &W0 Write storable parameters of current configuration in memory as profile 0 &W1 Write storable parameters of current configuration in memory as profile 1 &X0 Derive transmit clock signal from modem's internal oscillator (internal clock signal on pin 15) &X1 Derive transmit clock signal from attached computer (external clock signal on pin 24) &X2 Derive transmit clock signal from receive carrier (slave receive clock signal on pin 15) &Y0 Specify stored user profile 0 as power-up configuration &Y1 Specify stored user profile 1 as power-up configuration &Zn=x Store phone number x in location n (0-3) RESULT CODE SUMMARY: When you issue a command, the modem responds with a result code to indicate whether it understands and can act on the instructions (either OK or ERROR). In addition, result codes report the progress of a connection. With the V command options, you can choose whether result codes are reported as words or numbers (see the chart below); the factory setting is as words (V1). You can also select the set of result codes you want reported during call progress with the X and W command options. If you prefer not to have the modem return result codes, or if the software you are using does not handle responses from the modem, you can turn off result codes with the Q1 command option. COMMAND RESPONSE AND CALL PROGRESS MONITORING: The factory setting enables the extended set of result codes for call progress monitoring (X4). When set up in this way, the modem performs and reports full call progress monitoring (RING, NO CARRIER, NO DIALTONE, and BUSY). It also indicates the speed of the connection (CONNECT 1200 as opposed to simply CONNECT). NUMBER WORD EXPLANATION ------ ---- ----------- 0 OK Command executed 1 CONNECT Connection at 0 to 300, 1200, 1200/75, 75/1200, 2400, 4800 9600, 19200, or 38400 bps is X0 selected; otherwise, at 0-300 bps 2 RING Ring signal indicated 3 NO CARRIER Carrier signal not detected, or lost 4 ERROR Invalid command, checksum, error in command line or command line exceeds 255 characters 5 CONNECT 1200 Connection at 1200 or 1200/75, 75/1200, bps (disabled by X0) 6 NO DIALTONE No dial tone detected. Enabled by X2 or X4, or W dial modifier 7 BUSY Engaged (busy) signal detected. Enabled by X3 or X4 8 NO ANSWER No silence detected when dialing a system not providing a dial tone. Enabled by @ dial modifier 10 CONNECT 2400 Connection at 2400 bps (disabled by X0) 11 CONNECT 4800 Connection at 4800 bps (disabled by X0) 12 CONNECT 9600 Connection at 9600 bps (disabled by X0) 14 CONNECT 19200 Connection at 19200 bps (disabled by X0) 22 CONNECT 1200/75 Connection at 1200 bps when transmitting and 75 bps when receiving 23 CONNECT 75/1200 Connection at 75 bps when transmitting and 1200 bps when receiving 28 CONNECT 38400 Connection at 38400 bps (disabled by X0) NEGOTIATION PROGRESS MESSAGES: V-series system products report special result codes during error-control negotiation. Whether or not these messages are displayed is selected with the W command. The factory setting is messages disabled (W0) to avoid conflict with software programs that do not support this additional level of call progress monitoring. NUMBER WORD EXPLANATION ------ ---- ----------- 40 CARRIER 300 Carrier detected at 300 bps 44 CARRIER 1200/75 Carrier detected, at 1200 bps when sending and at 75 bps when receiving 45 CARRIER 75/1200 Carrier detected, at 75 bps when sending and at 1200 bps when receiving 46 CARRIER 1200 Carrier detected at 1200 bps 47 CARRIER 2400 Carrier detected at 2400 bps 48 CARRIER 4800 Carrier detected at 4800 bps 50 CARRIER 9600 Carrier detected at 9600 bps 66 COMPRESSION: MNP5 compression negotiated CLASS 5 67 COMPRESSION: V.42bis compression negotiated V.42BIS 68 COMPRESSION: Hayes Adaptive Data ADC Compression negotiated 69 COMPRESSION: No compression negotiated NONE 70 PROTOCOL: Asynchronous mode NONE 71 PROTOCOL:ERROR- Error-control mode with LAPB protocol CONTROL/LAP-B 72 PROTOCOL: Error-control mode with extended CONTROL/LAP-B/HDX protocol in half-duplex 73 PROTOCOL: ERROR- Error-control mode with AFT CONTROL/AFT 74 PROTOCOL: Synchronous X.25 connection established X.25/LAP-B with a carrier speed of 1200, 2400, 4800, or 9600 bps 75 PROTOCOL: Synchronous X.25 half-duplex connection X.25/LAP-B/HDX established with a carrier speed of 4800 or 9600 bps 76 PROTOCOL:X.25/ Asynchronous X.25 connection X.25/LAP-B/AFT Established; AFT used 77 PROTOCOL: V.42 LAP-M LAP-M 78 PROTOCOL: V.42 LAP-M with half-duplex LAP-M/HDX 79 PROTOCOL: V.42 LAP-M with AFT LAP-M/AFT 80 PROTOCOL: Alternative protocol (MNP compatible) ALT 91 AUTOSTREAM: Multiplexing of muliple virtual channels LEVEL 1 92 AUTOSTREAM: Transparent control of one PAD LEVEL 2 (non-simultaneous) 93 AUTOSTREAM: Transparent control of all PADs LEVEL 3 (simultaneous) S-REGISTER SUMMARY: S-Registers are special memory locations that hold values used by the modem for configuration and operating parameters. All V-series system products incorporate the group of S-Registers associated with Smartmodem product functions. These registers serve as counters, timers, and frequently used ASCII characters. A second group, associated with V-series functions, are used to configure the modem's feature negotiation options. A third group adjusts various modem PAD options. Changes to S-Register values can be made with the Sr=n command and read with the Sr? command. For a complete description of each S-Register, see the V-series System Product User's Reference. Factory-set values are indicated by bold type. SMARTMODEM REGISTERS: These registers can be adjusted to suit the desired configuration of the modem within the range of values indicated in the Range/Units column below. A + in the Factory Setting column indicates the value of this register cannot be stored as part of a user-defined profile. When the modem is reset, the factory setting for this register will be recalled from memory. FACTORY REGISTER DESCRIPTION RANGE/UNITS SETTING -------- ----------- ----------- ------- S0 Select ring to answer on 0-255 rings 0 S1 Ring count (incremented 0-255 rings 0+ with each ring) S2 Escape sequence character 0-127 ASCII 43 S3 Carriage return character 0-127 ASCII 13+ S4 Line feed character 0-127 ASCII 10+ S5 Back space character 0-32, 127 ASCII 8+ S6 Wait before blind dialing 2-255 sec 2 S7 Wait time for carrier 1-255 sec 50 S8 Duration of delay for 0-255 2 comma S9 Carrier detect response time 1-255 1/10 sec 6 S10 Delay carrier loss to hang 1-255 1/10 sec 14 up S11 Duration/spacing of tones 50-255 msec 95 S12 Escape sequence guard time 0-255 1/50 sec 50 S18 Select test timer 0-255 sec 0 S25 DTR change detect time 0-255 1/100 secY 5 S26 RTS/CTS delay 0-255 1/100 sec 1 S30 Automatic timeout. This 0-255 10 sec 0 register monitors the activity on the line. The factory setting is 0, timer disabled Y When the modem is configured for synchronous operation, and until on-line, units are measured in seconds rather than in 1/100 seconds. V-SERIES REGISTERS: The values held in the S-Registers described below select between several operating conditions. The values written to these registers (except the status response registers S85 and S86) can be stored in memory as part of a user-defined profile with the &W command options. REGISTER S36: Negotiation fallback - When the initial attempt to connect in error-control mode fails, this register specifies the subsequent action that should be taken. VALUE EXPLANATION ----- ----------- 0 Hang up 1 Attempt a standard asynchronous connection (&Q0) 3 Attempt an asynchronous connection using automatic speed buffering (&Q6) 4 Attempt a V.42 Alternative Protocol connection (MNP compatible); if negotiation fails, hang up 5 Attempt a V.42 Atlernative Protocol connection (MNP compatible); if negotiation fails, attempt a standard asynchronous connection 7 Attempt a V.42 Alternative Protocol connection (MNP compatible); if negotiation fails, attempt an asynchronous connection using automatic speed buffering NOTE: The selected fallback option can be initiated immediately with Register S48. For example, a connection attempt using the Alternative Protocol can be forced by setting S48=128 and S36=5 or 7. REGISTER S37: Maximum DCE line speed - selects the speed (for all modes except V.25bis) at which the modem attempts to connect with a remote modem; speed will be the highest DCE speed supported by both modems not exceeding the speed specified by this register. (See S93 for V.25bis modes). VALUE EXPLANATION ----- ----------- 0 Speed of last AT Command issued 1 75 bps 2 110 bps 3 300 bps 5 1200 bps 6 2400 bps 7 4800 bps 9 9600 bps REGISTER S38: Delay before forced hang up - specifies the number of seconds the modem waits when in error-control mode (&Q5) before performing the disconnect operation after receiving the command to hang up or an on-to-off transition of DTR. The range of this register is 0-255 seconds; the factory setting is 20 seconds. If the register is set to a value between 0 and 254, the modem will wait that number of seconds, or until all data has been transferred, before hanging up. If the register is set to 255, the modem does not hang up until all data is transferred. REGISTER S46: Error-control protocol selection - specifies the error-control method used for subsequent connections VALUE EXPLANATION ----- ----------- 0 Either LAPM or fallback to LAPB 1 LAPB only 2 LAPM or fallback to LAPB; use data compression+ 3 LAPB with data compression+ 6 X.25 or fallback to LAPB; use data compression+ 136 LAPM only 138 LAPM with data compression+ 134 X.25 + The technique negotiated is determined by capabilities and configuration of both modems. V.42bis is attempted first, then Hayes Adaptive Data Compression. If neither method is supported by both modems, or if either modem has compression disabled, no compression will be used. REGISTER S48: Feature negotiation action - selects how feature negotiation is used when making connections with the remote system. The negotiation process can be tailored to suit a connection or bypassed altogether. For example, when the capabilities of the remote modem are known, negotiation is unnecessary. The factory setting is 7, negotiation enabled. VALUE EXPLANATION ----- ----------- 0 Negotiation disabled; presume the remote modem is configured for and has the capabilities necessary for the connection selected with S46 3 Negotiation enabled, but originating modem remains silent during detection phase for connections with MNP modems; defeats connection sequence with other V.42 modems 7 Negotiation enabled 128 Negotiation disabled; forces fallback options specified in S36 to be taken immediately REGISTER S49: Buffer lower limit - specifies the minimum size of the buffer used in error-control or automatic speed buffering mode. The range is 1-249 bytes; the factory setting is 8. REGISTER S50 : Buffer upper limit - specifies the maximum size of the buffer used in error-control or automatic speed buffering mode. The range is 2-250 bytes; the factory setting is 16. REGISTER S63: Leased line carrier level - selects the carrier power level in dBm for leased line operation. This register specifies a carrier level value that is not to be exceeded. The range for this register is 0-15 (0 dBm to -15 dBm). The factory setting is 0. REGISTER S69: Link layer window size - sets the number of frames (packets) sent between acknowledgements from the remote system. The range is 1-15 with a factory setting of 15. LAPM connections use a window size of 1-15; LAPB connections and X.25 connections use a window size of 1-8. If a LAPB or X.25 connection is made, any value greater than 8 is treated as 8. REGISTER S70: Maximum number of retransmissions - determines how many times the modem will retransmit a frame. The range is 0-255 retries with a factory setting of 10. REGISTER S71: Link layer timeout - sets the delay between retransmissions to the remote system. The range is 1-255 1/10 seconds, with a factory setting of 2 (200 milliseconds). REGISTER S72: Loss of "flag idle" timeout - specifies the interval between idle flags. The range is 1-255 seconds with a factory setting of 30. REGISTER S73: No activity timeout - specifies the period of inactivity (no data, only good carrier and flag idle received) before the modem sends a query (an "RR") to the remote modem to verify that it is operating properly. The range is 1-255 seconds with a factory setting of 5. REGISTER S82: Break signaling technique - selects a method of break signal handling for V.42 communications: in sequence, expedited, and destructive. Break signals provide a way for you to get the attention of the remote host. The break type used depends on your application. VALUE EXPLANATION ----- ----------- 3 "Expedited" signaling regardless of its sequence in data sent and received; data integrity maintained 7 "Destructive" signaling regardless of its sequence in data sent and received; data in process at time is destroyed 128 "In sequence" signaling as data is sent and received; data integrity maintained ahead of and after break. REGISTER S84: Adaptive start up negotiation (ASU) - selects the adaptive start up method to be negotiated for subsequent connections. VALUE EXPLANATION ----- ----------- 0 Do not negotiate ASU connection 128 Negotiate ASU with fixed start up 129 Negotiate ASU with fast start up on both sides 130 Negotiate ASU with smooth start up on both sides 131 Negotiate ASU with configuring modem using fast start up and the other modem using smooth start up 132 Negotiate ASU with configuring modem using smooth start up and the other modem using fast start up REGISTER S85: ASU negotiation report - indicates which adaptive start up method has negotiated for the current connection. To read this register, issue the escape sequence to place the modem in the command state, then issue ATS85?<---. The modem will report one of the values below. CODE EXPLANATION ---- ----------- 0 ASU not negotiated; fixed start up in use 128 ASU negotiated with fixed start up 129 ASU negotiated with fast start up on both sides 130 ASU negotiated with smooth start up on both sides 131 ASU negotiated with reporting modem using fast start up and the other modem using smooth start 132 ASU negotiated with reporting modem using smooth start up and the other modem using fast start up REGISTER S86: Connection failure cause code - helps determine the cause of a connection failure. When the modem issues a NO CARRIER result code, a value is written to this S-Register. To read this register following the connection failure, issue ATS86 <---. The modem will report one of the values below. CODE EXPLANATION ---- ----------- 0 Normal hang up; no error occurred 4 Physical carrier loss 5 Feature negotiation failed to detect presence of another error-control modem at the other end 6 Other error-control modem did not respond to feature negotiation message sent by this modem 7 Other modem is synchronous-only; this modem is asynchronous-only 8 Modems could not find a common framing technique 9 Modems could not find a protocol in common 10 Incorrect Feature negotiation message sent by other modem 11 Synchronous information (data or flags) not received from other modem. Modem waited 30 seconds before hanging up 12 Normal disconnect initiated by other modem 13 Other modem did not respond after many transmissions of the same message. Modem made 10 attempts then hung up 14 Protocol violation occurred 15 Compression failure REGISTER S92: MI/MIC operation - enables (chooses method) or disables the mode indicate/mode indicate common interface. The settings available for this register support various combinations of edge and level detection in either originate or answer mode with ring indicator (RI) pulse enabled or disabled. Note that setting this register to a value other than the factory setting (0) automatically redefines the jack setting specified with the &J command. VALUE EXPLANATION ----- ----------- 0 MI/MIC disabled 1 level triggered, originate mode, RI pulse enabled 3 edge triggered, originate mode, RI pulse enabled 5 level triggered, answer mode, RI pulse enabled 7 edge triggered, answer mode, RI pulse enabled 9 level triggered, orginate mode, RI pulse disabled 11 edge triggered, originate mode, RI pulse disabled 13 level triggered, answer mode, RI pulse disabled 15 edge triggered, answer mode, RI pulse disabled REGISTER S93: V.25bis DTE interface speed - selects the speed used when the modem is configured for V.25bis mode. When autobauding in any mode other than V.25bis, the modem uses the value held in S37. VALUE EXPLANATION ----- ----------- 3 300 bps 5 1200 bps 6 2400 bps 7 4800 bps 9 9600 bps REGISTER S94: Command mode selector - provides an alternative to setting internal DIP switches when choosing between the AT command mode (factory setting) and the various CCITT V.25bis command modes supported by the modem. To use this register, DIP switches 3 and 4 must both be in the UP position (factory setting). VALUE EXPLANATION ----- ----------- 0 Standard AT command operation (factory setting) 1 Asynchronous V.25bis using addressed access 2 Synchronous V.25bis (HDLC framing) using addressed access 3 Synchronous V.25bis (Character framing) using addressed access 5 Asynchronous V.25bis using direct access 6 Synchronous V.25bis (HDLC framing) using direct access 7 Synchronous V.25bis (Character framing) using direct access 9 Asynchronous V.25bis using addressed access with EBCDIC character set option 10 Synchronous V.25bis (DHLC framing) using addressed access with EBCDIC character set option 11 Synchronous V.25bis (Character framing) using addressed access with EBCDIC character set option 13 Asynchronous V.25bis using direct access with EBCDIC character set option 14 Synchronous V.25bis (HDLC framing) using direct access with EBCDIC character set option 15 Synchronous V.25bis (Character framing) using direct access with EBCDIC character set option REGISTER S95: Negotiation message options - enables various result codes that indicate the sequence of events in the establishment of an error-control connection (these are listed under "Result Codes"). This register does not affect the way in which the modem negotiates the connection; it merely enables message options. The factory setting for this register is value 0, not bits selected. To enable any combinatin of the bits, add the values(s) to the right of the bit number and set the register to this sum. Note that changing the W command setting does not affect the value set for this register. BIT VALUE EXPLANATION --- ----- ----------- 0 1 Use speed of DTE-to-modem connection when reporting DCE line speed (CARRIER message). 1 2 Append "/ARQ" to CONNECT result code when an error-control connection is made 2 4 Enable CARRIER messages 3 8 Enable PROTOCOL messages 4 16 Enable AUTOSTREAM messages 5 32 Enable COMPRESSION messages X.25 PAD REGISTERS: The following registers are used only for X.25 packet switched calls. Their values do not affect other connections. REGISTER S53: Global PAD configuration - defines a set of behavior switches that control the X.25 PAD and all four virtual channels. VALUE EXPLANATION ----- ----------- 0 CCITT compatibility 1 CCITT compatibility; PAD prompt is an asterisk and is preceded by the channel number (e.g.,1*) 2 Fixed user interface; PAD prompt is a hyphen 3 Fixed user interface; PAD prompt is a hyphen preceded by the channel number (e.g.,1-) 4 Fixed control interface; PAD prompt is a hyphen 5 Fixed control interface; PAD prompt is a hyphen preceded by the channel number 6 Fixed user and fixed control interface; PAD prompt is a hyphen 7 Fixed user and fixed control interface; PAD prompt is a hyphen preceded by the channel number REGISTERS S74, S75: Minimum incoming logical channel number - S74 (upper two decimal digits) and S75 (lower two decimal digits) combine to specify the lowest incoming logical channel number the packet layer will accept and report. The range for S74 is 0-40 (in units of 100) with a factory setting of 0. The range for S75 is 0-99 with a factory setting of 1. For example, setting S74=10 and S75=60 specifies 1060 as the lowest incoming logical channel number the packet layer will accept and report. REGISTERS S76, S77: Maximum incoming logical channel number - S76 (upper two decimal digits) and S77 (lower two decimal digits) combine to specify the highest incoming logical channel number the packet layer will accept and report. The range for S76 is 0-40 (in units of 100) with a factory setting of 40. The range for S77 is 0-99 with a factory setting of 95. For example, setting S76=40 abd /S77=90 specifies 4090 as the highest incoming logical channel number the packet layer will accept and report. REGISTERS S78,S79: Outgoing logical channel number - S78 (upper two decimal digits) and S79 (lower two decimal digits) combine to specify the outgoing logical channel number the packet layer will use to place a call. The range for S78 is 0-40 (in units of 100) with a factory setting of 0. The range for S79 is 0-99 with a factory setting of 16. For example, setting S78=30 and S79=75 specifies 3075 as the outgoing logical channel number the packet layer will use. REGISTER S80: Packet layer N20 parameter - sets the maximum number of times a restart request can be retransmitted. The range is 0-255 with a factory setting of 1. REGISTER S81: Packet layer T20 parameter - sets the maximum duration (in 10 second increments) the transmitter waits for acknowledgement of a restart request frame before initiating a recovery procedure. The range is 0-255 with a factory setting of 18 (180 seconds). PAD COMMANDS FOR X.25 CONNECTIONS: Although calls to an X.25 Packet Switched Network are placed using the D command, once connected, calls are made from one of the modem's four channels using a set of command instructions specific to CCITT triple-X PADs. For descriptions of the commands used with X.25 connections, refer to the V-series System Product User's Reference. DTE INTERFACE CONNECTION: Proper connections between the modem and the computer or other device on which it is installed are mandatory for establishing connections and maintaining data integrity during communications. The chart below details the Data Terminal Equipment (DTE) interface connector pin assignments and circuit descriptions of each signal for the modem's DTE interface connection. Both the EIA (Electronic Industry of American) and the CCITT V.24 standard nomenclature are provided. This information should be used to determine the cabling requirements for your application. If you are unable to purchase a cable meeting your needs, contact Hayes Customer Service. PIN EIA V.24 SIGNAL DIRECTION DESCRIPTION --- --- ---- ---------------- ----------- 1 AA 101 N/A Protective Ground 2 BA 103 To modem Transmit Data 3 BB 104 From modem Receive Data 4 CA 105 To modem Request To Send 5 CB 106 From modem Clear To Send 6 CC 107 From modem Data Set Ready 7 AB 102 N/A Signal Ground 8 CF 109 From modem Data Carrier Detect 12 CI 112 From modem Data Signal Rate 15 DB 114 From modem Transmitter Clock 17 DD 115 From modem Receiver Clock 20 CD 108.2 To modem Data Terminal Ready 22 CE 125 From modem Ring Indicator 23 CI 112 From modem Data Signal Rate 24 DA 113 To modem Transmitter Clock NOTE: In a synchronous mode, pins 15,17, and 24 carry signal element timing. In AutoSync mode, pin 22 carries an end-of-frame signal. Some hardware and software monitor this circuit and pin 20 for modem control; Hayes Smartcom products do not. When using RTS and CTS local flow control, pin 4 and pin 5 must be supported. EXPERIENCING DIFFICULTIES? The following suggestions may answer your questions before you go to more technically detailed sources such as the V-series System Product User's Reference, or to your hardware manuals. Your first reference should always be your software's manual as the software controls the operation of the modem. Check for proper use of communication signals: Refer to your computer and software manuals to determine whether the modem's response to signals needs to be adjusted with AT commands. For example, the requirements for Data Terminal Ready and Carrier Detect signaling (controlled by the &D2 and &C1 commands, respectively) vary between communication environments. The way in which the computer and the software use signals will determine how the modem should respond to or control them. Verify the appropriate communication standard: The modem uses the B command options to select between various communication standards (see the B command listing on this card and the Installation Guide for communication standards supported by your modem). Some remote systems require that a particular communication standard and associated speed be selected. Adjust modem's command response: Some computer and software combinations do not react as expected when the modem responds to commands and/or provides call progress monitoring with result codes. Use the X,V,W, and Q commands to configure the modem's responses to meet these needs. Verify adequate use of local flow-control: When using the modem in error-control mode (&Q5) or in asynchronous mode with speed buffering (&Q6), some method of flow-control is necessary. The method should be selected based on the capabilities of the software and the requirements of the attached device (see the &K command options).