DM562AP
Operation Manual & AT Command Set
Integrated Data/Fax/Voice/Speakerphone Modem
Preliminary
27
Version: DM562AP-MA-P01
February 2, 2004
Register
S27
: Bit-mapped Register.
Bit-mapped register S27 lets you control modem
transmission mode and line type.
Bit
Function
0
0: Dial up line (&L0) – default.
1: 2W Leased line (&L1).
1-7 Undefined.
Register
S30
: Value of the voice inactivity timer.
S30 = 0
Voice inactivity timer off (default).
S30 = 1 – 255 This is the period of time (in sec), which
if expired causes the modem to hang
up the telephone line if it is offhook and
no data has passed during the period.
When there is an inactivity time out with
#CLS=8, the modem always forces
#CLS=0 and #BDR=0.
Register
S36
: V.42 negotiation fallback.
Register S36 defines the type of connection attempted
by the modem and the action to take if the attempt fails:
Bit
Value Function
2,1,0 = 0
Modem hangs up.
1
Same as 5.
2
Reserved.
3
Same as 7.
4
Modem tries to connect using V.42
Alternative Protocol (compatible wit
MNP levels 2 - 5). If handshaking fails,
modem hangs up.
5
Modem tries to connect using V.42
Alternative Protocol compatible with
MNP levels 2 - 5 ). If handshaking fails,
modem tries to connect using a
standard asynchronous connection.
6
Reserved.
7
Modem tries to connect using V.42
Alternative Protocol (compatible with
MNP levels 2 - 5). If handshaking fails,
modem tries to connect using a
standard asynchronous connection
and automatic speed buffering --
default.
Register
S46
: Protocol selection.
Register S46 defines the protocol selections specified
for future negotiation.
Value Function
136
LAP-M only.
138
LAP-M with adaptive data compression –
default.
Register
S82
: Break handling
Register S82 specifies the break signal method used
during V.42 applications. The break type to be used
depends on the user application.
Value Function
3
Expedited break signaling, regardless of its
sequence in data sent and received by each
modem. Data integrity maintained both ahead
of and after the break.
7
Destructive break signaling, regardless of its
sequence in data sent and received by each
modem. Data not being processed by each
modem at time of break is discarded.
128
In sequence break signaling as data is sent and
received. Data integrity is maintained both
ahead of and after the break. – default.
Register
S95
: Negotiation message options.
<
32
Disable V.42 extended response.
≥
32
Enable V.42 extended response.
Register
S97
: Energy detection threshold
This register can use in Call Progress Mode (CPM)
mode, for dial tone detect threshold. The default value is
2. This register determines the detection threshold for
Call Progress (CPM) tones. The default value is 2.