XE2486 データシートの表示（PDF） - Xecom

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XE2486

Miniature 2400 bps Modem Module

Xecom 

AT Commands

Modes of Operation

The XE2486"AT" commands provide two

operational modes in the XE2486; Command

Mode and Data Mode.

Data Mode: The XE2486 enters data mode after

it establishes a modem link and issues a

"CONNECT" result code. In Data Mode the

modem transmits all signals on Transmit Data

(TXD) to the remote modem and puts data from

the remote modem onto Received Data (RXD).

When the modem exits data mode, it issues a "NO

CARRIER" result code.

Command Mode: The XE2486 enters command

mode on power-up, reset, a lost connection, or

escape code receipt. In command mode the

modem accepts commands from the host on

transmit data. The modem returns appropriate

responses on received data.

Command Line Format

Command lines issued to the modem follow a

strict format. The ATprefix begins each command.

The command buffer stores the command line

which is executed upon receipt of a carriage

return. Until executed, the command line can be

editied with a backspace.

Command Prefix - Each command begins with

the AT prefix. The "A" and "T" may be both upper

case or both lower case but cannot be of different

cases. The prefix identifies the speed and parity of

the host. The modem measures the width of

incoming bits to determine speed and compares

parity bits of the two characters to determine parity.

Command Line - A command line may include a

series of commands. The modem executes such

commands in the sequence they appear. A

carriage return terminates the command line and

executes the commands. Register S3 allows

selection of another character to terminate the

command line.

Command Buffer - The command buffer holds a

maximum of 40 characters, including the AT

prefix. Space inserted into the command line do

not fill space in the command buffer. Attempting to

load a longer command line causes the modem to

issue an "ERROR" result code and the commands

are not executed.

Command Line Editing - A backspace can be

used to edit the command line beforeexecution.

The backspace erases the previous character in

the command line. Register S5 allows selection of

a character other than a backspace to edit the

command line.

Re-Execute Last Command - An "A/" causes the

modem to re-execute the last command line. This

command which does not require the "AT" prefix.

Ommitted Parameters - Most commands include a

parameter which determines how the functions will

be set. When this parameter is omitted from the

command string, it is assumed to be a 0.

Escape Characters - A 3-character escape

sequence switches the modem from data to

command mode while remaining on line. The

escape character, Register S2, must be entered 3

times in succession within a 1 second guard time

to execute the escape. The default escape

sequence is "+++."

Result Codes - The modem issues a result code

after each action. Result codes may be provided

as full words, 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 preceed and follow

each result code.

XECOM

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XE2486

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