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Chapter 10 − Modem Mode AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. MultiConnect Serial-to-Serial Adapter User Guide (S000354A) 123
Register Unit Range Default Description
S36 7 LAPM Failure Control. This value indicates what should happen
upon a LAPM failure. These fallback options are initiated immediately
upon connection if S48=128. If an invalid number is entered, the
number is accepted into the register, but S36 will act as if the default
value has been entered. *
Default: 7 (00000111b)
Bits 0-2
0 = Modem disconnects.
1 = Modem stays on-line and a Direct mode connection is
established.
2 = Reserved.
3 = Modem stays on-line and a Normal mode connection is
established.
4 = An MNP connection is attempted and if it fails, the modem
disconnects.
5 = An MNP connection is attempted and if it fails, a Direct
mode connection is established.
6 = Reserved.
7 = An MNP connection is attempted and if it fails, a Normal
mode connection is established. (Default.)
Bits 3-7 Reserved
S37 0 Specifies Desired Line Connection Speed.
(V.22bis only)
Bits 0-3 Desired line connection speed. This is linked with the Fn
command. If an invalid number is entered, the number is accepted
into the register, but S37 will act as if the default value has been
entered.
0 = Attempt automode connection (F0). (Default.)
1-3 = Attempt to connect at 300 bps (F1).
4 = Reserved.
5 = Attempt to connect at V.22 1200 bps (F4).
6 = Attempt to connect at V.22bis 2400 bps (F5).
7 = Attempt to connect at V.23 (F3).
Bits 4-7 Reserved
S38 seconds 0–255 20 Delay Before Forced Hang Up. Specifies the delay between the
modem's receipt of the H command to disconnect (or ON-to-OFF
transition of DTR if the modem is programmed to follow the signal),
and the disconnect operation. Applicable to error-correction
connection only. This parameter can be used to ensure that data in
the modem buffer is sent before the modem disconnects.
If S38 is set to a value between 0 and 254, the modem will wait that
number of seconds for the remote modem to acknowledge all data in
the modem buffer before disconnecting. If time expires before all data
is sent, the NO CARRIER result code will be issued to indicate that
data has been lost. If all data is transmitted prior to time-out, the
response to the H0 command will be OK.
If S38 is set to 255, the modem does not time-out and continues to
attempt to deliver data in the buffer until the connection is lost or the
data is delivered.
S39
3 Flow Control Bit-Mapped Options Status.
Default: 3 (00000011b)
Bits 0-2 Status of command options
0 = No flow control
3 = RTS/CTS (&K3) (Default.)
4 = XON/XOFF (&K4)
5 = Transparent XON (&K5)
6 = Both methods (&K6)
Bits 3-7 Reserved