User's Manual

DR-915L OEM DATA RADIO MODULE

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Revision I INTEGRATOR’S GUIDE

The numeric value populated in the Retries field specifies the number of attempts the

radio will make in trying to resend unacknowledged packets. The value in the Timeout

field determines how long the radio will wait for the acknowledgement before

resending. (See Hardware Timing for more information)

Number of Repeaters

The range of the DR-915L may be extended by using repeaters. Repeater modules

receive data packets on one group code and retransmit the packet on another group

code. For example, a repeater configured with group codes 3 and 4 will translate the

following packets and retransmit them as follows:

• A packet received with a destination group code of 3 will be received and

retransmitted with a destination group of 4.

• A packet received with a destination group code of 4 will be received and

retransmitted with a destination group of 3.

This method of group code translation guarantees that data is transferred through the

repeater and not directly between radios.

When the DR-915L is in Ack-Back™ mode and there are repeaters in the system, the

amount of time needed to receive packet acknowledgements increases. By specifying

the number of repeaters in the Configuration program, this delay is calculated and the

radio is updated correctly. Always populate this field with the maximum number of

chained repeaters in the system.