Operating instructions

1892 1335 - Orion Radio Modem Operating Instructions - v2.9 / Aug 2009 63
APPENDIX A: AT COMMAND REFERENCE
Normally the GUI is the best way to configure, control and interrogate a local Orion unit.
However, if you want to use your own equipment and software to do this, you can use either of
the serial ports to send ASCII AT commands and receive replies, which are listed in this
Appendix.
As is standard for AT commands, they are differentiated from data to be transmitted by
sending a special code. The next three sections explain how to enter Command Mode, the
syntax used during configuration, and how to exit Command Mode and return to sending and
receiving data normally. The remaining sections list the commands in detail.
In this part of the manual, characters which are sent or received literally through the port are
shown as such. Non-printing characters such as the Enter key, or the carriage return and line
feed characters, are shown thus: <enter>, <CR>, <LF>.
Where <enter> is shown, the unit expects to receive the characters <CR><LF> (ASCII codes
0A and 0D hex, 13 and 10 decimal). Most terminals send these codes in response to the
<enter> key, but the keystrokes <ctrl+M><ctrl+J> are equivalent.
Important: Any configuration changes made will not be saved to the
non-volatile memory until you issue a write command (AT&W).
Otherwise, the Orion will return to its former settings when it is powered
down.
Entering Command Mode (+++)
Command Mode is activated with the string
[wait]+++[wait]<enter>
where [wait] is a period when no data is sent to the unit. It must be at least the period set by
ATS154, default value 10ms.
The unit responds with:
OK<CR><LF>
The unit is now ready to receive and reply to commands.
v Transmission and reception are blocked during Command Mode.
In order to be recognised as the Command Mode instruction rather than data, these
conditions must be fulfilled:
v No data must be sent to the unit for at least the time set by ATS154
v The symbol + must be sent three times consecutively immediately following the
wait period, with no intervening characters.
v Again, no data must be sent to the unit for at least the time set by ATS154
v The next data received by the unit must be <CR><LF> (usually sent from a
terminal by keying <enter>)