Boca Systems M144PA, Manual

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In all other modes, and after establishing a call in Synchronous Modes 1
and 4, the value specified in S25 is defined in 11100 seconds. In any
mode, a change in DTR (i.e., ON-to-OFF transitions) that persists for a
shorter time than the valued specified in S25 is ignored by the modem
while in On-line Data Mode.
Range: 0-255 (100ths second if On-line or On-line Command State)
0-255 (1 second otherwise) Default: 5
S26 RTS to CTS Delay Interval: (1)
S26 is only used for synchronous operation. This register, when the
modem is configured for &R0, specifies the time delay between an off-to-
on transition on RTS and turning CTS on.
Range: 0-255 (100ths second)
Default: 1 (100ths second)
S27 Bit-mapped Options: (none)
S27 is a read-only register that indicates ‘AT’ command settings.
Bit 3,1,0 000 &Q0 is selected*
001 &Q1 is selected
010 &Q2 is selected
011 &Q3 is selected
100 &Q4 is selected
101 not used
110 not used
111 not used
Bit 2 0 &L0 is selected*
1 &L1 is selected
Bits 5,4 00 &X0 is selected*
01 &X1 is selected
10 &X2 is selected
11 reserved
Bit 6 0 B0 is selected
1 B1 is selected*
Bit 7 Reserved