XE2422H 查看數據表（PDF） - Unspecified

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XE2422H

Low-Cost, 2400 BPS Surface-Mount Modem

Unspecified 

XE2422H AT Commands

The XE2422H uses a simplified "AT" command set

for configuration and control. This section describes

the AT command format and lists the AT commands,

registers and result codes. XE2422H "AT"

commands have three operational modes; command

mode, alarm mode and data mode. The Data Rate

for the XE2422H is set by Register SE0.

Data Mode: The XE2422H enters data mode

after it connects to a remote modem and issues the

appropriate 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.

Alarm Mode:

The XE2422H supports a unique set of commands

to establish alarm industry connections. Both Pulse

messaging and FSK formats are supported. The

AT!1 command initiates Pulse messaging and AT!2

initiates FSK messaging. The ATD command must

precede either AT! command to begin the Alarm

transaction. In Alarm mode, /DTR must be

removed to disconnect the modem link. /DTR is

activated by setting register SE2 bits 4 and 5.

Pulse Mode: In Pulse Mode messages are passed

using DTMF tones. The receiving station

acknowledges receipt of the message by

transmitting the “Kissoff” tone. A sample

transaction is shown below.

Command Mode: The XE2422H 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 RXD.

Command Line Format

Command lines issued to the modem follow a strict

format. Each command line begins with the prefix

AT. All commands except the “z” command must

be entered in upper case characters. The command

line is a string of commands between the AT prefix

and the carriage return which terminates the

command. The command buffer stores the

command line and executes it upon receipt of a

carriage return. Commands will be executed in the

sequence they appear in the command line.

Result Codes - The modem issues a result code

after each command line. Result codes may be sent

as single characters or single characters followed by

a carriage return.

Alarm Panel

XE2422H

ATDT#!1<message 1><CR>

K

!<message 2><CR>

K

!<message n><CR>

K

Disconnect is accomplished by raising /DTR.

FSK Mode: In FSK Mode messages are passed

on a 300 bps, half-duplex carrier signal. The X1,

X2, and X3 commands switch the modem between

monitoring the line for acknowledgments (X1),

transmitting messages (X2), and receiving

messages (X3). As in the pulse mode disconnect is

only possible by pulling the /DTR signal high.

XECOM

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XE2422H

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