Chapter 12 - Status Registers & Result Codes
12-5
Command bit dec hex Function and description Ref.
S25= 0-255 0-FF Specify the time delay that DTR signal needs
to be OFF before it will be recognized, in 10
ms units. If S25=0, the delay time is set to 4
ms
+000
S26= dec hex RTS/CTS delay +000
0-255 0-FF Set the delay, in 10 millisecond units between
the RTS and modem’s CTS response in
synchronous mode (see ‘&Rn’ command)
&Rn
S27= bit dec hex Bit mapped register
0-2 Modem error control
0 0 No error control &K0
1 1 MNP4 + MNP3 (see also S41.0) &K1
2 2 MNP4 + MNP5 (see also S38.5, S41.0) &K2
3 3 V.42+MNP4 &K3
4 4 V.42 + V.42bis (compatible with &K2) &K4
3-5 0 0 Flow control disabled &H0
24 18 Hardware (RTS/CTS) flow control &H3
32 20 Software (XON/XOFF) flow control &H4
40 28 Reserved &H5
6-7 Signal quality
0 0 No response to poor signal quality *Q0
64 40 Retrain action taken if signal quality *Q1 is
poor
128 80 Adaptive rate (auto fall-back /forward) when
signal quality changes *Q2
S41.2
192 C0 Disconnect when signal quality is poor *Q3
S28= bit dec hex Bit mapped register +068
0 0 0 Reserved
4-5 0 0 No guard tone &G0
16 10 Reserved &G1
32 20 1800 Hz guard tone &G2
7 0 0 * Select V.22 for 1200 bps communication
128 80 Select Bell 212A for 1200 bps communication
S29= 0-39 0-39 Set default dial phone number pointer, use
AT&Zn=s to store phone numbers +000
*D
S31= 0-255 0-FF Holds the ASCII decimal value of the XON +017
S32= 0-255 0-FF Holds the ASCII decimal value of the XOFF +019
S35= bit dec hex Bit mapped register
0 1 1 Use CELL 4800T trells coded 4800 for V.32
4800 (available with cellular mode only)
1 2 2 Disable aborting from terminal during modem
handshaking
2 4 4 V.26 alternative A. (see also ‘&N11’)
3 8 8 Add 12 dBm attenuation to the leased line
4 16 10 When Data/Voice with is pressed, modem will
dial the default number. *Dn
S29
5 32 20 Enable Selective Reject in V.42 (Default)