0049-1800-xxx 326X V.34, V.34-SDC and V.32bis Series Modem – USER’S GUIDE 02/23/2010
Rev. A
Page 59
of
205
Option Set 1 – Async Calls to Central Site Using AT ACU
Changing Default Configuration Settings
Depending on application requirements, you may need to change the following:
•
Buffer Delay
(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.
•
When the 326X is configured for Option Set 1: if you do not use the AT ACU to send commands
to operate the modem, you must customize the DTE port by selecting these options:
o
DTE Rate
. Set the modem’s DTE rate to match the asynchronous DTE’s rate using the
DTE Rate option (AT
*
DE, TERMINAL OPTS category).
o
Parity
. Set the modem’s parity to match the parity set in the asynchronous DTE using the
Parity option (AT
*
RP, ACU OPTS category).
o
Character Length
. Set the modem’s character length (Char Length, ACU OPTS
category) to match the length set in the asynchronous DTE.
(Refer to Appendix A for parameter and setting descriptions.)
•
In Option Set 1, the default settings assume you will use the AT ACU to operate the modem (for
example, the default for
ACU Select
=AT; EIA signals are set high.) If you plan on using DTR
transitions (“DTR Dialing”) to signal the modem to make a call (rather than AT Commands), do
the following:
1.
Set
Default Dial
=1 (AT*DA, ACU OPTS category).
2.
Store a number in memory location 1 (using
Enter Phone
#, AT&Z, 9600 T/D?
category).
3.
Set
DTR
=108.1 (AT&D, TERMINAL OPTS category). When DTR is raised, the
modem will dial the specified call.
•
If the DTE does not require EIA signal pins to be held high, adjust the EIA settings (TERMINAL
OPTS category) to match your application requirements.
•
In Option Set 1, the modem is set for XON/XOFF (software) flow control. If your application
requires hardware flow control, change the
Flow
setting (AT
*
FL, TERMINAL OPTS category).
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