User's Manual

CDR-915 OEM DATA RADIO MODULE
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Revision O INTEGRATOR’S GUIDE
9
Addressing
The radio has been designed to be very versatile in its addressing functions. Each radio
has its own identifier consisting of a group number and address number.
The Source Group specifies which group of radios the unit being configured belongs to.
The Source Address specifies the address within that group that uniquely identifies this
radio. The radio will decode packets containing a Destination Group and Address
matching its own. With the exception of broadcast messages, all others will be ignored.
Broadcast messages are those messages where the destination address is 0 and the
group is the same as the radio receiving it, or those messages where the destination
address and group are both 0. When the destination group is set to 0, all radios in all
groups will decode the packet.
Likewise, the Destination Group specifies which group of radios the transmissions will
go to. The Destination Address specifies the individual radio within that group that will
receive the message.
TX Hold Off Time
TX Hold Off Time sets the amount of time that must elapse after the last byte to be
transmitted is received by the radio before a transmit packet will be initiated. Setting
this value higher will prevent numerous small packets from being sent when the
transmit data is not continuous. The default setting will be adequate for most
applications.
Acknowledgement (Ack-Back™)
The CDR-915 has powerful built-in path management features designed to make OEM
integration quick and easy. Activating packet acknowledgement will virtually guarantee
all data transmitted is received. Any packet transmitted by the CDR-915 is then
acknowledged by the receiving radio. If any packet is not acknowledged, the
transmitting radio will resend the data. While reducing throughput, this feature also
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. (See Hardware Timing for more
information)