FireLine System Protocol Manual
7
Raveon Technologies Corp.
5. Remote Procedure Request (RPR)
5.1. RPR Overview
Modems with firmware D3 and above have over-the-air diagnostics capability.
When the modem is in the COMMAND mode, csome commands may be issued
that are intended for use on other modems in the system. The modem
connected to the command user’s device will send the command to the intended
remote FireLine over-the-air on the currently selected channel.
The remote modem will process the requested command (whether or not it is in
its COMMAND mode) and then transmit its response back to the requesting
modem. Depending upon baud-rate, the command, and the system
configuration, the response may take some time to execute. The requesting
FireLine modem will time-out after 5 seconds if a response does not come back.
RPR commands are generally used to interrogate remote modems, and find out
their internal statistics, operation parameters, and how they were configured.
If a <CR> is entered into the requesting FireLine while it is waiting for a remote
response, it will then abort the request and not send the time-out message if the
remote request does not come back. Even when a <CR> is entered, if the
response is received from a remote modem, the FireLine that initiated the RPR
will output the response.
5.2. RPR Protocol
All FireLine modems with Firmware version D2 and above have the ability to
send a Remote Procedure Request to other FireLine modems. The requesting
FireLine must be in the COMMAND mode. A FireLine modem is put into the
command mode using the +++ sequence per the FireLine Data Radio MODEM
Technical Manual. Section 5.3 describes the various RPR commands that are
available.
When a FireLine modem receives an RPR response message back from the
remote modem that executed the RPR, it will output the message in the following
general format:
<REPLY
> The Phrase “<REPLY>” in ASCII characters, followed by a and ASCII
<CR> and <LF>.
FROM=1234
The Phrase “FROM=” followed by the 4-digit ID of the modem that sent the
RPR response, and then a <CR> <LF> sequence.
RSSI=-76
The RPR response text. This may be one parameter, a list of parameters,
or other information. It is dependent upon the RPR command. See section
5.3 for a description of the RPR responses.
</REPLY>
The Phrase “</REPLY>” in ASCII characters, followed by a and ASCII
<CR> and <LF>. This phrase may be used to determine the end of the
RPR message.
All RPR responses end with a
<CR><LF>
sequence. So for example, the line
<REPLY> is actually sent as: < R E P L Y >
<CR> <LF>
(19 stránky)
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