User's Manual

DR-915 OEM DATA RADIO MODULE

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Revision A INTEGRATOR’S

GUIDE

handles missed transmissions as well as performs path management, allowing full

duplex communications.

The Retries field specifies the number of attempts the radio will make in trying to

resend unacknowledged packets. The Timeout field determines how long the radio will

wait for the acknowledgement before resending.

Number of Repeaters

The range of the DR-915 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-915 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 set this field with the maximum number of chained

repeaters in the system.