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APPENDIX C. S REGISTERS
ACTIVE Professional External Modem User’s Manual
29
S18 *
Test timer
Default : 0
Sets the length of time in second which the modem conducts a test
before returning to the command mode. If this register is zero, the test
will not automatically terminate; the test must be terminated from the
command mode by issuing an AT&T0 or ATH command.
S19
Reserved
S20
Reserved
S21 *
Bit mapped options
Bit 0
0
AT&J0 (Default)
1
AT&J1
Bit 1
Reserved
Bit 2
0
AT&R0
1
AT&R1 (Default)
Bit 3,4
0
AT&D0
1
AT&D1
2
AT&D2 (Default)
3
AT&D3
Bit 5
0
AT&C0
1
AT&C1 (Default)
Bit 6
0
AT&S0 (Default)
1
AT&S1
Bit 7
0
ATY0 (Default)
1
ATY1
S22 *
Bit mapped options
Bit 0,1
0
ATL0
1
ATL1
2
ATL2
3
ATL3
Bit 2,3
0
ATM0
1
ATM1
2
ATM2
3
ATM3
Bit 4-6
0
ATX0
4
ATX1