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8–18
S41 Bit-mapped register, default: 0:
S42 Bit-mapped register, default: 0:
Q2 (1) 1 2 The modem does not return result codes
when answering. No RING or CONNECT
message.
(0) Reserved.
Note: Bits (6,5,4,3) enable ring detection on a combination of four ring
types. All zeroes enable ring detection on any ring longer than
100ms. Please refer to Chapter 13 for details on EDR operation.
Code Bits Bin. Dec. Description
(7) 1 128 Ignores calling tone. Not for fax detection.
(6) 1 64 Does not answer on the first ring, forces
S0≥2.
(5) 1 32 DSR follows CD, off for 0.5s after a CD on-off
transition. (See &Sn)
(4) 1 16 If one of X2-X7 is set, the modem waits for
the number of seconds set in register S6
before dialing, and it ignores the dial tone
detection.
(3) 1 8 Enables ITU-T signals 140 and 141 on
EIA-232D interface.
(2) 1 4 Extends the retrain time-out timer to
5 minutes. (See *Qn, S27b6)
(1) 0 0 Selects flag idle in V.25bis HDLC.
(Default; see *I1, S17b6)
1 2 Selects mark idle in V.25bis HDLC.
(0) 1 1 Special MNP compatibility. (See also &Kn,
S27b0, S38b5)
Code Bits Bin. Dec. Description
(7) 1 128 CD pulses off for 0.5 sec at carrier loss, CD
is always on otherwise.
(6) 1 64 Disables RINGING result code. (See
ATXn)
Code Bits Bin. Dec. Description