XE1414 查看數據表（PDF） - Xecom

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XE1414

14,400 BPS Modem for Data, Fax, Voice

Xecom 

AT Commands

The XE1414 uses "AT" commands for modem

configuration and control. Extensions to the AT

commands support fax and voice.

Modes of Operation

The XE1414 has three operational modes; Command,

Fax and Data.

Data Mode: The XE1414 enters data mode after it

establishes a connection and issues a "CONNECT"

result code. In the Data Mode the modem sends all

signals on Transmit Data to the remote modem and puts

data from the remote modem onto Received Data for

the host equipment. When the modem exits data mode,

it issues a "NO CARRIER" result code.

Command Mode: The XE1414 enters command mode

on power-up, reset, loss of the 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 - Multiple commands may be placed in

a command line. Commands are executed in the

sequence they appear. Spaces may be inserted to

improve legibility without filling space in the command

buffer. A carriage return terminates the command line

and causes the commands to be executed. Register S3

allows the user to select a character other than a

carriage return to terminate the command line.

Command Buffer - Only 40 characters, including the

AT prefix, may be loaded into the command buffer. If

the command buffer overflows, the modem issues an

"ERROR" result code and commands are not executed.

Command Line Editing - The backspace can be used

to edit the command line. Hitting the backspace key, or

Control and H simultaneously on some systems, erases

the previous character in the command line. All of the

characters can be erased except for the "A" and "T."

Register S5 allows the user to select a character other

than a backspace to edit the command line.

Fax Mode: The XE1414 enters Class 1 fax mode on

receipt of AT+FCLASS=1 and Class 2 fax mode on

receipt of AT+FCLASS=2. In fax mode commands and

responses are issued at 19,200 bits per second; the

character format is 8 bits no parity. The modem accepts

fax commands only in fax mode. The A/, ATO, AT&T

and escape commands are not valid in fax mode.

Command Line Format

Command lines issued to the modem follow a strict

format. Each command begins with the prefix AT. The

command line is stored in the command buffer and

executed upon receipt of a carriage return. Until

executed, the command line can be editied with the

backspace key.

Command Prefix - The "A" and "T" of the command

prefix may be both capitilized or both lower case but

cannot be of different cases. The prefix identifies the

speed and parity of the host. The modem determines

speed by measuring the width of the incoming bits.

Parity is determined by comparing the parity bits of the

"A" and "T." The XE1414 normally sends result codes at

the speed and parity determined by the prefix.

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.

Ommitted Parameters - Most commands include a

parameter which determines the command function.

When this parameter is omitted from the command

string, it is assumed to be a 0.

Escape Characters - A three character escape

sequence maybe entered while in data mode to switch

the modem into command mode while remaining on line.

The escape character, set by Register S2, must be

entered 3 times in succession 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

precede and follow each result code.

XECOM

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XE1414

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