0049-1800-xxx 326X V.34, V.34-SDC and V.32bis Series Modem – USER’S GUIDE 02/23/2010
Rev. A
Page 61
of
205
Synchronous Dialing from an IBM AS 400
The modem operates as a synchronous originate modem with the IBM AS 400. Set the modem to
Option Set 3 – no reconfiguration from this Option Set is necessary. The AS 400 supports switched
operation with call origination via a V.25bis compliant call establishment driver. Using Option Set 3
allows it to be driven by APPC/APPN, the bit-synchronous protocol supported by the IBM AS 400.
In an AS 400-to-400 (mainframe-to-mainframe) environment, the setting of the Calling Number
parameter is critical to ensure the AS 400 operates properly with the modem. Rather than entering the
phone numbers you will be calling, set
CALLNBR to *NONE
. This setting allows you to properly
utilize V.25bis commands.
Chapter 3, Automatic Calling Interfaces, in the
326X Series Modem Reference Guide
, describes bit-
synchronous protocol frame formats.
Option Set 4 – Async Answering Central Site without ACU (Models 3260/62/65/67)
Changing Default Configuration Settings
Depending on application requirements, you may need to change the following:
•
The Buffer Delay feature (AT*DB, EC/DC OPTS category), when enabled, allows buffered data
in the communications link to be effectively transmitted to the other modem before the modems
disconnect. Enable this feature if your application
does not
ensure a complete transfer of data
before the modems disconnect.
•
The default
Answer
option is country-specific. Refer to Appendix C to verify that this option is
appropriate for your application.
•
In Option Set 4, the default option for
ACU Select
=None. If you want an ACU to operate the
modem, select an ACU and a data format.
•
If you do not use the AT ACU to send commands to operate the modem, customize the DTE port
as follows:
o
Set the modem’s DTE rate to match the asynchronous DTE’s rate using
DTE Rate
(AT
*
DE, TERMINAL OPTS category).
o
Set the modem’s parity to match the parity set in the asynchronous DTE using
Parity
(AT*RP, ACU OPTS category).
o
Set the modem’s character length, using
Char Length
(ACU OPTS category) to match
the character length in the asynchronous DTE.
(Refer to Appendix A for parameter and setting descriptions.)
•
In Option Set 4, the modem is set for XON/XOFF (software) flow control. If your application
requires hardware flow control, change the
Flow
option (AT*FL, TERMINAL OPTS category).
•
If the DTE does not provide DTR, the modem will not automatically answer an incoming call.
Set
DTR
=High (AT&D, TERMINAL OPTS category).
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