Operating instructions

1892 1335 - Orion Radio Modem Operating Instructions - v2.9 / Aug 2009 75
APPENDIX B: OVER-AIR COMMAND CODES
Normally the GUI is the best way to configure, control and interrogate a remote Orion unit.
However, if you want to use your own equipment and software to do this, you can use the
serial port of the local Orion to send over-air commands and receive corresponding replies,
which are listed in this Appendix.
Summary of Messages and Responses
The table below summarises the message codes used over the air between the Base station
and the Outstation. These codes are sent with other necessary information, such as
Outstation ID, command parameters etc., and the full syntax is shown in the table starting on
page 77.
There are three types of transaction:
1. The Base station tells the Outstation to do something, and the Outstation
confirms with an acknowledgement that repeats the original information as a
check (shown here as Set).
2. The Base station asks the Outstation for information, and the Outstation reports
back with the information (shown here as Read and Report).
3. An alarm occurs at the Outstation, causing it to initiate a transmission sending
some information to the Base station (shown here as Initiate).
Thus, for example, the message 26 from the Base station should always be followed by the
reply 56 from the Outstation, and the transaction has the meaning:
“Set the PSU low trip level to X”; “I have set the PSU low trip level to X”