V.22 bis Modem with AT Commands
CMX866
S-Register
Description
Lost carrier to hang up delay - Sets the length of time
that the CMX866 waits before hanging up after the loss
of a carrier. This allows the CMX866 to distinguish
between disturbances that momentarily break the
connection and the remote modem hanging up.
Reg Range Units
S10
Default
1-255
100ms
7
5-25
10ms
50ms
10
20
S11
S12
DTMF tone duration - Defines the duration of DTMF
tones for tone dialling. The length of pause between
each DTMF tone is the same as this duration time.
0-255
Escape code guard time - Specifies the minimum time
of no data before and after entry of the escape
sequence.
0-255
0-255
S13
S14
Reserved
Hex
92
General options - provides the following functions:
Bit 0 - V.23/Bell 202 Turnaround, 0 Disabled, 1 Enabled
Bit 1 - Echo command character, 0 Disables echoing
(ATE0), 1 Enables echoing (ATE1)
Bit 2 - Result code display, 0 Send responses (ATQ0),
1 Do not send responses (ATQ1)
Bit 3 - Word or number responses, 0 Send number
responses (ATV0), 1 Send word responses (ATV1)
Bit 4 - DSP or S-Register o/p format, 0 Decimal, 1 Hex
Bit 5 - Fast Connect, 0 Disabled, 1 Enabled
Bit 6 - ESC pin, 0 Disabled, 1 Enabled
Bit 7 - Answer/originate operation, 0 Answer (ATA),
1 Originate (ATD)
0-255
0-255
10ms
10ms
8
6
S15
S16
Loopback Carrier Off Time - To terminate a loopback
test at a remote modem, the CMX866 turns off the
carrier sent to that modem for the time specified in this
register.
Drop Time for Loopback - If a loopback test is being
performed by a remote modem, detection of a drop in
the carrier from that modem which exceeds the time set
in this register will cause the local loopback to be
removed.
0-255
0-255
1s
1s
30
0
S17
S18
Handshake Timeout - If the handshake sequence, when
answering, exceeds this duration, the handshake will be
aborted and the modem will return to Command mode.
Loopback Timer - Defines the duration in seconds for
which the modem performs diagnostic tests. On timeout,
the test is terminated and the modem returns to
Command mode. The default value of 0s disables the
loopback timer, so that tests will run indefinitely. A test
can also be terminated from Command mode at any
time by issuing the AT&T0 command, which then returns
the modem to Data Transfer mode.
ã 2004 CML Microsystems Plc
26
D/866/4
CMLMICRO [ CML MICROCIRCUITS ]
