Appendix A
MODEM REGISTERS
Modem registers determine operation characteristics. Appendix A
describes each register individually, except for registers which cannot
be modified. Registers in
bold
represent default settings.
Reading or Changing a Register
To read the current content of a register, issue command Sr?. To
change the register, use command Sr=.
For example:
AT S7?
Reads register S7.
AT S7=150
Sets register S7 to 150.
AT S0?S16?
Reads registers S0 and S16.
Auto Answer Ring Number
S0
Range: 0-255
Unit: Ring
Default: 0
Register S0 determines the number of rings before the modem answers
a call.
For example:
S0=0
Will not auto answer calls.
S0=3
Answers incoming calls after the third ring.
Ring Count
S1
Register S1 counts the number of rings on the telephone line when the
modem is set to auto answer. Register S1 is cleared eight seconds after
the last ring. The default is 0.
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