4 AT Commands, S-Registers, and Result Codes

Register Unit

Range

Default

Description

 

S36

decimal

0–7

7

LAPM Failure Control. Specifies the fall-

 

 

 

 

back action to take in the event of an LAPM

 

 

 

 

negotiation failure. These fallback options

 

 

 

 

are initiated immediately upon connection

 

 

 

 

if S48 is set to 128. If an invalid number is

 

 

 

 

entered, S36 acts as if the default value has

 

 

 

 

been entered. (See S48.)

 

 

 

 

0

Modem disconnects.

 

 

 

 

1

Modem stays online 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 modem connection

 

 

 

 

 

is established.

S37

decimal

0–12

0

Sets the maximum V.34 speed at which the

 

 

 

 

modem attempts to connect. The default

 

 

 

 

value attempts an automode connection. If

 

 

 

 

N0 is active, connection is attempted at the

 

 

 

 

most recently sensed serial port speed

 

 

 

 

(+MS= command settings are updated to

 

 

 

 

the appropriate values). If N1 is active,

 

 

 

 

connection is attempted at the highest possi-

 

 

 

 

ble speed. (+MS= settings are updated to

 

 

 

 

11,1,300,33600 to reflect V.34, automode,

 

 

 

 

300 bps minimum speed, and 33600 bps

 

 

 

 

maximum speed). Supported only for com-

 

 

 

 

patibility with existing software; use the

 

 

 

 

+MS= command instead.

S38

seconds

0–254, 255

20

Sets the delay between the modem’s receipt of

 

 

 

 

the H command to disconnect (or high-to-

low transition of DTR if the modem is pro- grammed to follow the signal), and the disconnect operation. Applies only to error- correction connections. This register 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 waits for the remote modem to ac- knowledge all data in the modem buffer before disconnecting. If S38 is set to 255, the modem does not time out, and continues to

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Multi-Tech Systems MT5600BL, MT5600BA manual S36