Total Control MP/16, Operator'S Manual

Page: 146 / 182

D-22 AT Command Reference
Register Default Function
S27 0 Bit-mapped register. Select the bit(s) you want ON
and set to the total of the values in the Value column.
Bit Value Result
0 1 Enable ITU-T V.21 modulation at 300
bps for overseas calls. In V.21 mode,
the modem an swers both Bell 103 and
V.21 calls, but only originates V.21 calls.
1 2 Enable unencoded (non-trellis-coded)
modulation in V.32 mode; this option is
part of the ITU-T V.32 recommendation,
but is rarely used.
2 4 Reserved.
3 8 Disable 2100 Hz answer tone to allow
two V.42 modems to connect more
quickly.
4 16 See below.
5 32 See below.
6 64 Reserved.
7 128 Unusual software incompati bility.
Some software may not accept certain
result codes. This setting disables the
codes and displays the 9600 code
instead. The call's actual rate can be
viewed on the ATI6 screen.
Error control handshaking options: select the total
values of bits 4 and 5.
Bit 4 Bit 5 Result
0 0 Complete handshaking sequence: V.42
Detection, LAPM error control, MNP
16 0 Disable MNP
0 32 Disable V.42 Detection and LAPM
16 32 Disable Detection phase if you know
that the remote modem does LAPM,
but not the Detection phase.