XE5620G Просмотр технического описания (PDF) - Xecom
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XE5620G Datasheet PDF : 19 Pages
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XE5620G AT Commands
The XE5620G uses "AT" commands for configuration
and control. This section describes the AT command
format and lists the AT commands, Registers and Result
codes. XE5620G "AT" commands have two operational
modes; Command Mode, Data Mode and FAX mode.
Data Mode: The XE5620G 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.
Command Mode: The XE5620G 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.
Fax Mode: The XE5620G enters Class 1 fax mode on
receipt of AT+FCLASS=1. 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 buffer stores the command line and executes
it upon receipt of a carriage return. Until executed, the
command line can be edited with the backspace key.
Command Prefix - Each command, except the A/
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 commands sent to the modem. The modem
deternies data rate by measuring the width of the
incoming bits. Parity is determined by comparing the
parity bits of the "A" and the "T."
Command Line - Commands may be strung together in
a single command line of up to 36 characters. Com-
mands 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 termi-
nates 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 - The Command Buffer holds a
maximum of 36 characters, including the AT prefix. If
the command buffer overflows, the modem issues an
"ERROR" result code and commands are not executed.
Command Line Editing - The backspace edits a
command line before it is executed. The backspace key,
(Control and H simultaneously on some systems), erases
the previous character in the command line. Register S5
allows the user to select a character other than a back-
space to edit 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 pa-
rameter 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.
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XE5620G
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