VEGA Phoenix PSI Data Fax Modem - Manual (Page 109)

AT Commands
692302 6-21
6.4 S Registers
Your modem has 105 registers (S0 through S104). These registers influence the
operating characteristics of the modem, send your information via your modem, and
enable you to test your modem. The values of certain registers can be modified
using specific commands. If you use a command to modify a register value, this
command remains active until your switch off or reset your modem. Your modem
then reverts back to the operating characteristics stored in its permanent memory.
Reading a Register Value
Use the Sr? command to read the current value of a register:
r = Register number (0 through 104)
Your modem displays a three-digit decimal value for the register.
Modifying a Register Value
Use the Sr=n command to modify the current value of a register:
r = Register number (0 through 104)
n = New value