User guide

Rev 1 Oct.13 361
*DU Query or set the dial command to only use UDP.
AT*DU? to query
AT*DU=n to set
• n=0 — Dial using the means specified (default)
• n=1 — Dial UDP always, even when using ATDT
When this parameter is set you cannot establish a TCP PAD connection by using the Dial
command.
*ENQ Query or set the option to output an ENQ [0x05] after the TCP CONNECT, delayed by the
Delay Connect Response time (S221).
AT*ENQ? to query
AT*ENQ=n to set
• n=0 — Disable (Default)
• n=1 — Enable ENQ on TCP CONNECT
*HOSTMODE? Query the current host mode.
AT*HOSTMODE? returns:
•AT
•PPP
•TCP
• UDP
Note: If the device is not in AT mode, Telnet into the device to execute this command.
MD Query or set the default start-up mode for the serial port. When the device is power-cycled,
the serial port enters the mode specified by this command after 5 seconds. On startup,
typing ATMD0 within 5 seconds changes the mode to normal (AT command) mode. See
also S53 to set the port for UDP.
AT*MD? to query
AT*MD=hh to set
• hh (hex byte)=00 — Normal (AT Command mode)
• hh=02 — PPP
• hh=03 — UDP
• hh=04 — TCP
• hh=08 — reverse telnet/ssh
• hh=13 — Modbus ASCII
• hh=23 — Modbus RTU (Binary)
• hh=33 — BSAP
• hh=63 — Variable Modbus
• hh=83 — UDP Multiple Unicast
Note: The I/O X-Card only supports AT, UDP, and TCP.
Table D-10: Serial AT Commands (Continued)
Command Description