101
Appendix
S-Registers
S-registers are memory locations in the modem that you can program to suit
your data communication needs. For instance, you can set up the modem to
automatically answer all incoming data calls.
S-registers are numbered from 0 (zero) to 255 (that is, S0 to S255). Since
many of these registers are reserved for purposes of internal operation, you
may customize only a subset of the modem’s registers.
To see the list of S-Registers that you may customize, see “Customizing S-
Registers” on page 102.
Programming an S-Register
To program an S-register:
1. Go to the command mode of your communication software.
2. Type ATSn=x where n is the number of the S-register that you want to
customize; and x is the value that you want to assign to that register.
For example, to set up your modem to automatically answer all
incoming data calls, type ATS0=x (where x is any number between 1
and 255).
3. Press Enter.
N O T E S
• You might experience undesirable consequences on
the operation of the remote modem if you modify the S7
or S10 registers from their default values. For optimal
performance, use the default values for these two
registers.
• If you write to an S-register that is not programmable or
if the value that you assigned to a register is invalid, the
modem will still return an OK message on the computer
screen. But, this will have no effect on S-register values.
