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CHAPTER 6: S-Registers
6.2.2 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?.
6.3 AT Command and S-Register Summary
The vast majority of installations are similar, with the Series II Modem
being used to dial up a remote installation where the call is automati-
cally answered. Your Series II Modem has a default configuration to dial
another 33,600 bps modem that support error correction, data com-
pression and flow control. If the answering modem is not compatible,
the Modem 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 that you may recall factory installed defaults by entering
AT&F8&W0). The &W command changes the configuration para-
meters 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 com-
mands to display the current modem configuration.