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Using RF Modem ID Codes

Raveon has products with various radio identification ID features.  Each radio has an ID, and is assigned and ID to talk to.  This Application Note AN240 describes how ID processing works and describes all the ID features Raveon’s radios have that use the IDs such as broadcasting and repeating. 

Addressing Basics

One of the more powerful aspects of Raveon’s Radio Modems are its addressing scheme.  Addressing allows multiple radio systems on the same frequency to co-exist, and not interfere with each other.   Addressing is used to differentiate one radio modem from another.  Each unit has a unique number, so that when data or a GPS position report is received, the radio modem  that sent the message is known.  Use the Data Encryption Security KEY to protect messages from being intercepted.  Use the ID addressing to identify individual radio modems and GPS transponders.

This addressing scheme allows up to 65,000 (FFFF) radio modems to be on one radio channel, or split-up into sub-groups. A way to disable addressing altogether is set the Address Mask to 0000 (ATMK 0000 command).
For More Technical information about how to utilize Radio ID codes, read Application Note AN240.

You can also setup radios in Groups by using the Address Mask as F000, FF00, or FFF0 depending upon the group size you would like. F000 masks of the three lower ID numbers, so only the first number in the ID needs to match.

One effect of this is that an address mask of 0000 will cause the Radio Modem modem to received any data from any unit that transmits.  The Destination Address will effectively be ignored and all data received if the mask is set to 0000.

Listen Address:

The Listen Address is a second ID programmed into the radio, that the unit will Listen for.  The Listen Address is configured using the ATLA xxxx command.  If the Listen Address is set to FFFF, then this feature is ignored, and FFFF is the factory default so by default the Data Radio Modem does not use the Listen Address.

Store-and-Forward Repeating

The RADIO MODEM modem has a built-in wireless repeater.  Each RADIO MODEM is capable of not only sending and receiving data from/to its serial port, but also re-transmitting data packets it receives over-the-air data. 

Automatic Repeater Configuration

The easiest way to enable store-and-forward repeating is the use the REPEAT 1 command. REPEAT 1 will turn on the store-and-forward feature, and configure it to repeat all packets the radio can hear on the air.  REPEAT 0 disables store-and-forward repeating.

It is highly recommended that you use this method to configure your RADIO MODEM as a repeater.

Important:  The Unit ID of the repeater must be unique in the system. No other radio modem in the system can have the ID of the repeater.

Filed under: Message Formats, Over-the-air protocol | Posted on August 20th, 2019 by John Sonnenberg

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