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Chapter 6 - S-Registers
6.3 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.