XE2476 查看數據表（PDF） - Xecom

零件编号

产品描述 (功能)

比赛名单

XE2476

2400 bps Plug-In Upgrade to CH1776

Xecom 

AT Commands

The XE2476 uses "AT" commands for configuration and control. This section describes use

of the AT command format and lists the AT commands, Registers and Result codes used.

Modes of Operation

The "AT" commands have two operational modes; Command Mode and Data Mode.

Data Mode: The XE2476 enters data mode after it connects with a remote modem and

issues an appropriate "CONNECT" result code. In the Data Mode the modem sends all data

presented 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 XE2476 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

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 - Each command, except the A/ command, begins with the AT prefix. The

"A" and "T" may be either both upper case or both lower case but cannot be of different

cases. The prefix identifies the speed and parity of the commands sent to the modem by the

host. Speed is determined by measuring the width of the incoming bits. Parity is determined

by comparing the parity bit of the "A" and the "T."

Command Line - Commands may be strung together in a single command line of up to 40

characters. Commands are executed in the sequence they appear. Spaces may be inserted

into the command line but do not fill 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 - No more than 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.

4/XECOM

XE2476

Share Link: