SATELLINE-M3-TR3,
–
TR4 and -R4
Integration Guide, Version 3.4
37
SL commands provide an interface for a host device to command the radio modem directly. An
example of the procedure for creating or replacing a channel list:
1. Clear existing channel list (SL$C=0)
2. Set channel info for each of the channels to be created starting from index 0 (SL$L=)
3. Set number of channels in channel list (SL$C=)
4. Set the default channel (SL$D=)
5. Verify the new configuration:
Get number of channels in channel list (SL$C?)
Get channel info for each of the channels (SL$L?)
Get the default channel (SL$C?)
7. Enable Channel list (SL$M=1) in order to activate the Channel list
8. Save the settings (SL**>)
9.14
Repeater –mode
Repeaters and addressing may be used to extend the coverage area of a radio modem network,
and to direct messages to selected radio modems in the network. In large systems, with several
repeaters and formed repeater chains, it is often practical to use routing instead of plain
addresses.
In circumstances where it is necessary to extend the coverage area of a radio modem network,
modem can be used as repeater stations.
The maximum size of a repeated data packet is 1kB (kilobyte). The Repeater Function is
switched on in the radio settings. In the repeater mode the radio modem will function as a
totally independent unit. Other devices are not necessary.
A radio modem acting as a repeater can also be used to receive and transmit data. In repeater
mode the radio modem will transmit the received data to the serial interface in a normal
fashion. The difference being that the received data will be buffered into the buffer memory.
After reception the radio modem will re-transmit the buffered data using the same radio channel
as in reception. Data received through the serial interface a radio modem in repeater mode will
transmit normally.
The same network may include several repeaters, which operate under the same base station.
Repeaters may also be chained; in which case a message is transmitted through several
repeaters. In systems with more than one serially or parallelly chained repeater, addressing or
routing protocol must be used to prevent a message ending up in a loop formed by repeaters,
and to ensure that the message finally reaches only the intended radio modem.
Please contact SATEL for more information of Repeater- and Addressing
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features.