S registers are locations in a modem where settings are stored or status information can be examined. Modems can have dozens of S registers, while only the first 12 or so are standard. S registers are set by issuing ATSN=xx to the modem. N is the number of the register being set, while xx is the value the register is set at. For example, the register S0 determines how many rings the modem answers after.
S Registers
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