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T1 Modem Bank
134
S21 Bit-Mapped Options
Indicates the status of command options.
Default: (30h), (048d), (00110000b)
Bit 0 Reserved.
Bit 1 Reserved
Bit 2 CTS behavior (&R
n
)
0 &R0 CTS follows RTS
1 &R1 CTS is always on
Bit 4, 3 DTR behavior (&D
n
)
00 &D0 ignore
01 &D1 return to command mode
10 &D2 disconnect
11 &D3 reset modem
Bit 5 DCD behavior (&C
n
)
0 &C0 DCD is always on
1 &C1 DCD is on after connect
Bit 6 DSR behavior (&S
n
)
0 &S0 DSR is always on
1 &S1 DSR is on after connect
Bit 7 Reserved