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XE5690SM-1ITR

Compact, Low-Cost Global Embedded Modem

Xecom 

XE5690SM AT Commands

The XE5690SM uses "AT" commands for

configuration and control. This section describes

the AT command format and lists the commands,

registers and result codes.

Command Mode: The XE5690SM enters

command mode on power-up, reset, a lost

connection, or receipt of the escape code. In

command mode the modem accepts commands

from the host on transmit data. Appropriate result

codes are returned on received data.

Command Line Format

AT commands follow a strict format. Each

command line, except A/, begins with the prefix

AT. The "A" and "T" may be both upper case or

both lower case but cannot be of different cases.

The modem determines data rate of the host

equipment by measuring the width of the incoming

bits of the “A” and “T.”

Multiple commands may be combined into a single

command line of up to 48 characters. Commands

are executed in the sequence they appear upon

receipt of a carriage return. Spaces inserted into

the command line are not placed in the buffer.

The command line can be edited with a backspace

before it is executed. The backspace erases the

previous character in the command line. Register

S5 allows the user to select a character other than

backspace to edit the command line.

If the command buffer overflows, the modem

issues an "ERROR" result code, and the command

line is not executed. Register S3 allows the user to

select a character other than a carriage return to

terminate the command line.

Re-Execute Last Command - The A/ command

causes the modem to re-execute the last command

line. This is the only command which does not

require the "AT" prefix.

Omitted Parameters - Most commands include a

parameter which determines how the functions will

be set. When the command parameter is omitted

from the command string, it is assumed to be a 0.

Escape Characters - A 3 character escape

sequence may be entered to switch the modem

into command mode while on line. The escape

character, set by Register S2, must be entered 3

times in succession to execute the escape. An AT

command must then be entered within the period

defined by S12 to enter command mode. The

default escape sequence is "+++."

Result Codes - The modem issues a result code

after each action. Result codes may be sent as full

words, one or two digit numeric codes, or may be

disabled all together. Each result code ends with a

carriage return when numeric result codes are

chosen. When full word result codes are chosen, a

Line Feed and Carriage Return precede and follow

each result code.

XECOM

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XE5690SM

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