Multi-Tech Systems BA-Series - Manual (Page 56)

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MultiModemBA User Guide
5.2.1 Examples of Assigning Values
1. Let’s say you wish to have longer pauses caused by the comma in a dial command; five seconds
instead of two. Entering
ATS8=5 assigns 5 as the value for S-Register S8 (meaning the modem
pauses five seconds for a comma in a dial command).
2. In a second example, let’s say that you wish to configure the modem to answer incoming calls
after the 30th ring instead of after the first ring. To configure S-Register S0 with a value of 30,
enter
ATS0=30 and hit RETURN.
3. In a third example, let’s say you are calling long distance to another country code, and it is taking
a long time to connect. The S-Register S7 (Abort Timer) setting of 45 seconds, is insufficient.
The abort timer times out and cancels the call before a connection is made. To change the S7
value to 55 seconds, enter Command mode, then enter
ATS7=55 and hit RETURN. Now, after
dialing, the modem allows 10 more seconds for a carrier signal before aborting the call. The
additional 10 seconds should provide enough time for international calls.
5.2.2 Examples of Reading Values
To verify that you entered the value correctly in the above examples, enter ATS8? and hit RETURN
in the first example, ATS0? in the second, and ATS2? in the third example. You should receive the
response 005 in the first example, 030 in the second example, and 055 in the third example.
When configuring the S-Registers, it is a good practice to include the verification read-entry in the
same command line as the configuration assignment-entry. In the three preceding examples, enter
ATS8=5S8?, ATS0=30S3?, and ATS7=55S7?.
5.3 AT Command and S-Register Summary
The vast majority of installations are similar, with the modem being used to dial up a remote
installation where the call is automatically answered. Your modem has a default configuration to dial
another modem that supports error correction, data compression and flow control. If the answering
modem is not compatible, the MultiModem can match protocols, provided the protocols are industry
standard (i.e., ITU or Bell) and not proprietary.
The &W command, used in conjunction with specific other AT commands and S-Registers, can re-
configure the modem to conform to a specific application. The command AT&W0 (or AT&W) causes
the modem to store its current parameters in its nonvolatile RAM. The command also sets the
modem upon power up, or when it is reset with an ATZ command, the modem reads all of its
configuration and S-Register parameters from RAM, and not from the factory settings in ROM (note
you may recall factory installed defaults by entering AT&F8&W0). The &W command changes the
configuration parameters stored in RAM that you specifically intend to alter. All other default
parameters remain unchanged.
The AT&W1 command sets the modem so that it does not store its parameters in RAM, and on
power up or when an ATZ command is issued, parameters are read from the factory default settings
in ROM.
Before using the &W command, you may want to view the modem's current operating parameters.
Use the ATL5, ATL6 and ATL7 commands to display the current modem configuration.