User Manual

MHX-2400 Operating Manual: Chapter 3 Configuration Options 9
Note: If you want to send more than one command line, wait for a response
before entering the AT prefix at the start of the next command line.
To re-execute the previous command, enter A/. The modem will execute
the previous command line.
When in Command Mode, the modem “autobauds”, meaning that it will
automatically adjust to the baud rate of the terminal. You may change the
terminal baud rate while in Command Mode without losing communication
with the modem.
For the AT command protocol, an escape sequence consists of three
consecutive escape codes preceded and followed by at least 1 second of
inactivity. Typically, the ‘+’ character is used as the escape code.
+++ preceded and followed by 1 second of inactivity
Note that the terminal must be configured to the same baud rate as the
modem in order for the mode to recognize the escape sequence. The
modem is unable to “autobaud” while in Data Mode.
3.1 AT Commands
Several AT Commands are supported by the MHX-2400 module. The
following is a short description of all available commands. ‘*’ denotes
standard factory settings. All of the following commands must be preceded
by “AT”
A Answer
The A command causes the modem to attempt to connect with another
remote modem (Type ATA <return>).
E Command Echo
Your modem is preset to return (or echo) commands to the host
microprocessor when in Command Mode.
E0 No Command Echo
*E1 Command Echo
I Identification
The I command returns various modem information settings.
I1 Product Code (MHX-2400)
I2 Issue ROM Check (OK or ERROR)
I3 Product Identification (Firmware Version)
I4 Firmware Date
I5 Firmware Copyright
I6 Firmware Time
I7 Serial Number