S17
Reserved
S18
Modem Test Timer
S18 specifies the amount of time that the modem will conduct
one of the Ioopback tests (&Tn). After timing out, the modem
returns back to command mode. Setting S18 to zero disables the
modem test timer; the Ioopback test must be terminated by issuing
the appropriate escape sequence followed by an ‘AT&T0’ or ‘ATH’.
Range:
0-255 seconds
Default: 0 second
S19
Reserved
S20 Reserved
S21
Bit Mapped Options
Bit Value Description
Bit 0
0
&J0 is selected. (default)
1
&J1 is selected.
Bit 1
Reserved.
Bit 2
0
&R0 is selected. (default)
1
&R1 is selected.
3 - S REGISTER REFERENCE
45
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