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1997-02-17
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Attachmate Advanced 3270 Adapter Settings
Technical Bulletin 110
December 1993
Background
The Attachmate Advanced 3270 Adapter links a PC to an IBM-compatible 3174,
3274, or 3276 control unit. The adapter works with an IBM or compatible
PC/XT or AT, or a PS/2 with ISA slots. Although the adapter is best
complemented by Attachmate EXTRA! connectivity software, it also supports
software written for IBM and IRMA coax adapters. It is usually not necessary
to change the hardware settings because the adapter automatically identifies
the type of software being used. The adapter can be used to connect
stand-alone PCs or LAN gateways.
Technical Overview
The factory default DIP switch settings on the 3270 adapter are set for the
most commonly encountered configurations. In some situations, it may be
necessary to change the factory default settings. This document describes
the function of each switch setting. This document also contains information
about the coax and RJ-11 telephone-style jacks on the adapter.
DIP Switch Settings
On the 3270 adapter, you will notice a block of 10 switches in the lower left
corner. For examples of two types of Attachmate Advanced 3270 Adapters,
refer to Figure 1 on page 2. The DIP switch settings are the same for both
types of adapters.
Figure 1 - Advanced 3270 Adapters and Default DIP Switch Settings
As shown in Figure 1, all 10 switches on the adapter are in the OFF (default)
position. The chart below lists each switch and describes its function in
both the ON and OFF positions. To set a switch to ON, press down on the ON
side of the switch. Start with switch 1 and set each switch in numerical
order.
Switch Number Description
1 This switch is unused.
2 INTEN - Interrupt 2 enable.
ON - Overrides software and disables IRQ2.
OFF - Permits software to enable/disable IRQ2.
3 IBMEN - IBM I/O interface enable.
ON - Disables IBM I/O interface.
OFF - Enables IBM I/O interface.
4 and 5 IBMHI/LO - IBM I/O register addresses.
There are four possible combinations for these
switches. The default setting (OFF/OFF) is listed
first, followed by alternate settings.
Switch 4 Switch 5 Address
OFF OFF = 2D0-2DF
OFF ON = 6D0-6DF
ON OFF = AD0-ADF
ON ON = ED0-EDF
6 CX-EN - Power up communications.
ON - Communications are activated on power up. This
may only be necessary when using some IRMA-compatible
software.
OFF - Communications are not activated at startup.
When emulating IBM, communications will be enabled by
software. When emulating IRMA, communications will
be enabled by the first valid received IRMA command.
7 MEMEN - Memory enable.
ON - Power up with memory disabled; software can
enable it.
OFF - Power up with memory at CE000-CFFFF. The
software can change the address.
8 IRMEN - IRMA I/O enable.
ON - Disables IRMA I/O interface.
OFF - Enables IRMA I/O interface.
9 and 10 IRMHI/LO - IRMA I/O register addresses.
There are four possible combinations for switches 9
and 10. The default setting (OFF/OFF) is listed
first, followed by alternate settings.
Switch 9 Switch 10 Address
OFF OFF =220-227
OFF ON =280-287
ON OFF =260-267
ON ON =240-247
Configuring for IBM-Only and IRMA-Only Mode
The table below explains the settings for IBM-only and IRMA-only modes.
Setting Description
IBM-only mode In this mode, the IRMA I/O addresses are disabled.
The memory address range of the Advanced 3270 Adapter
is CE000-CFFFF. The I/O address of the adapter is
2D0-2DF and interrupts are enabled on IRQ2.
To run in IBM-only mode, move switch 8 (IRMEN) to the
ON position. All other switches must be in the OFF
position.
IRMA-only mode In this mode, all memory addresses are disabled, all
IBM I/O addresses are disabled, and interrupts are
disabled. The I/O address range is 220-227. In
IRMA-only mode, it is only possible to run in CUT
mode; DFT mode is not supported. In addition, the
diagnostic tests will not function in IRMA-only mode.
To run in IRMA-only mode, move switches 2 (INTEN),
3 (IBMEN), and 7 (MEMEN) to the ON position. All
other switches must be in the OFF position.
Coax and RJ-11 Telephone-Style Jacks
The coax/RJ-11 switch is located directly above the coax jack (see Figure 1
on page 2). One end of the switch is labeled "COAX" and the other end is
labeled "RJ-11." If appropriate, move the switch from the coax setting to
the RJ-11 setting.
On some adapters, the polarity switch is directly behind the RJ-11 jack
(see Figure 1 on page 2). This switch provides polarity reversal of the
twisted pair interface. To properly connect the adapter, choose the
appropriate cable type and then move the polarity switch to the "straight
through" position (=). If the proper cable is not available, move the switch
to the reversed position (X). This setting reverses the polarity of pins 3
and 4.
Additional Information
If you have further questions regarding Attachmate products, please call
Attachmate Customer Support at (800) 688-3270.
Technical bulletins and other information about Attachmate products are
available on our FaxBack system. To reach FaxBack, call (800) 688-3270 and
select option 7 from the menu. Technical Bulletins are included in the 1000
series of FaxBack documents. For example, Technical Bulletin 67 would be
ordered as document 1067 in FaxBack.
The Attachmate Electronic Bulletin Board System (BBS) can be reached at
(206) 649-6660.
1200 - 14400 Baud Rate
8,N,1 Communication parameters
ANSI-BBS Terminal emulation
Copyright 1993 Attachmate Corporation. All Rights Reserved.
Printed in the USA.
Attachmate and EXTRA! are registered trademarks of Attachmate Corporation.
FaxBack is a registered trademark of Intel Corporation.
PC/XT is a trademark and IBM, AT, and PS/2 are registered trademarks of
International Business Machines Corporation.
IRMA is a trademark of Digital Communications Associates, Inc.
Technical Bulletin 110 Prepared by Attachmate Customer Support