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APPENDIX C. S REGISTERS
ACTIVE Professional External Modem User’s Manual
30
5 ATX2
6 ATX3
7 ATX4
Bit 7 Reserved
S23 * Bit mapped options
Bit 0
0 AT&T5
1 AT&T4
Bit 1-3 Local DTE rate
0 0-300bps
1 600bps
2 1200bps
3 2400bps
4 4800bps
5 9600bps
6 19200bps
7 38400bps
Bit 4,5 Parity option
0 even
1 not used
2 odd
3 none
Bit 6,7
0 AT&G0
1 AT&G1
2 AT&G2
S24 Reserved
S25 Delay to DTR Default : 5
Register S25 serves two purposes. When the modem is operating in
synchronous mode 1, the value assigned to S25 specifies the length of
time which the modem waits after a connection has been made before
examining DTR. This allows the modem to ignore an ON-to-OFF
transition of DTR giving the user sufficient time to disconnect the
modem from the asynchronous terminal and attach it to a synchronous
terminal, without forcing the modem back to the asynchronous
command mode. During this time, the value for S25 is read in seconds
(e.g., the factory-set value of 5 equals 5 seconds).
In all other modes, and after call establishment in synchronous modes 1
and 4, the value is read in 1/100 second. In any mode, a change in DTR
(ON or OFF) that persists for a period shorter than the value held in S25
is ignored by the modem while it is in data mode.
S26 RTS to CTS delay interval Default : 1
Pertains to synchronous operation only. When CTS tracks RTS
(AT&R0) and the modem detects an ON-to-OFF transition on RTS, this