Research & Development
Command
bit dec
hex
Function and description
Ref.
S25=0, the delay time is set to 4 ms
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
+156
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) (default)
&K4
3-5
0 0 Flow
control
disabled
&H0
24
18
Hardware (RTS/CTS) flow control (default)
&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 is poor
*Q1
128
80
Adaptive rate (auto fall-back /forward) when signal
quality changes.(Defaults)
*Q2 S41.2
192
C0
Disconnect when signal quality is poor
*Q3
S28=
bit
dec
hex
Bit mapped register
+068
2-3
0 0 Destructive,
expedited
break
&Y0
1
4
Non-destructive, expedited break (default)
&Y1
10
8
Non-destructive, un-expedited break
&Y2
4-5 0
0
No guard tone (default)
&G0
16 10 Reserved
&G1
32
20
1800 Hz guard tone
&G2
6
0
0
DTE/DCE rate follows link rate (See also S18,
S44b6)
&B0
1
64
DTE/DCE rate is fixed at the DTE setting, range
from 300-460.8 Kbps (default, also see S18, S44b6)
&B1
S29=
0-3 0-3 Set
default
dial phone number pointer, use AT&Zn=s
to store phone numbers in EEPROM.
+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
+032
1
2
2
Disable aborting from terminal during modem
handshaking
2
4
4
V.26 alternative A. (see also ‘&N11’)
3
8
8
Add 16dB attenuation to the leased line transmission
power
5
32
20
Enable Selective Reject in V.42 (Default)
7
128
80
Enable extended numerical result codes from 50-65
when an error corrected connection is made. Use
with ATV0. (see result code table)
V0
S23.6
S38=
bit
dec
hex
Bit mapped register
+000
0
1
1
Repeatedly dialing default number
*Dn S29
3 8 8 DCD
ON/OFF
sequence follows UNIX standard,
DCD ON before connect message is sent, DCD off
after last DCE response is sent
&C1 S21.4
4 16 10 Auto-mode
fax
receiving disabled, hang up if a fax
call is received
&N0
5 32 20 Disable
MNP5
negotiation.
&Kn
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Revision 1.0
2003/6 From 3JTech