0049-2702-XXX Alliance Series Modems – USER MANUAL
08/05/2010
Rev. A
Page 117 of 197
A typical response might be
001
030
OK
meaning that the values in registers S0 and S7 are 1 and 30, respectively.
To set or change a parameter, use the command
S=
, where the number of the register follows
S
and a value between 0 and 255 (the range of values that can be assigned to the registers) follows
the equal sign:
AT S0=5
This command will change the value stored in S0 to 5.
The
S
command can also be used without
?
or
=
to point to a register that will be subsequently
read from or written to without being specified. To illustrate this, if you enter
AT S7
a pointer is set to the address of register S7. As long as no other
S
command is entered, the
register value can be requested at any time without specifying the number. If you enter
AT ?
the
modem displays the current value in the S7 register. Similarly, if you enter
AT=8
the modem
will change the value in the S7 register to 8.
S Register Functions
This section describes the function of the individual S registers. Table 4-4 lists the range of
possible parameters and the default value for each S register.
Only S registers that are intended
for user access are listed.
S0 – Ring to answer on
The value in this register determines how many rings the ALX will
allow before automatically answering a call. For example, if S0 is set to 3 (
AT S0=3
), the ALX
will answer when it detects the third ring. Setting S0 to 0 disables auto-answer.
S1 – Ring count
Register S1 counts the number of ring signals for each incoming call. If more
than 8 seconds pass since the last ring, S1 is cleared to zero. (Register S1 is a read-only
register.)
S2 – Escape sequence character
The value in register S2 (effective for asynchronous
operation only) defines the character used for the escape sequence (to escape from data transfer
