Standard AT Commands Supported

The Serial Device Server recognizes a subset of the standard AT command set. The data channel must be in the command mode for commands to be recognized. The data channel will be in command mode upon power up or reset.

There are two operating modes for the unit when the AT command option is enabled. In command mode, data received from the serial port is passed to the AT command processor, and responses are returned to the serial port. No data is sent to any network application, and any data received from the network is ignored. In data mode, data from the serial port passes to the network application, and vice versa. This is equivalent to the normal serial port operating mode without the AT command option.

Table 5 describes the AT Commands. Table 6 details the Extended AT Commands that allow the configuration of the network server operating parameters. Any AT command received, except the listed commands, are acknowledged with OK status. This allows existing modem applications to transmit commands without causing an error. These include AT<X>n, but not currently AT&<X>n, AT%<X>n, AT\ <X>n, where <X> is a letter.

Table 5 AT Commands

Parameter

Command

Description

Enter Command mode	<delay>+++<delay>	If the string +++ is seen in data mode, with no
		characters sent for 1 second before or after, then
		command mode is entered.

Initiate Connection	ATD <destination>	Standard modem dialing command, redefined to
Command		initiate an internet connection to a remote computer.
		Indicates the IP address of the target, and optionally the
		TCP port number to use for connection. The T or P
		option (ATDT or ATDP) can be present and has no effect.
		If present, the IP address must be exactly 12 decimal
		digits with 3 for each byte of the address.
		If no IP address is given, then the ECable destination
		address defined for the port is used.
		If the destination TCP port is defined, it is separated
		from the IP address by a '#' character, and is 1 to 5
		decimal digits.
		If TCP port is defined, the ECable destination port
		defined for the serial port is used. If the destination
		port is 0, the standard Telnet port (23) is used.
		If the destination string ends with a semicolon, the
		server remains in the command mode, not the data
		mode, once a connection is made.
		In command mode data is not passed from the
		remote computer, so data could be lost if the unit
		stays in command mode.
		If the connection cannot be attempted, NO CARRIER
		status is returned. If the connection attempt fails, NO
		ANSWER status is returned.
		If the connection succeeds, CONNECT status is
		returned.

Advanced Configuration	Silex		Page 29
	Part Number 140-00188-210A

SX-500-1402 specifications

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Silex technology SX-500-1402 Standard AT Commands Supported, AT Commands Parameter Description

Models: SX-500-1402