User's Manual

DR-915L OEM DATA RADIO MODULE
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Revision I INTEGRATOR’S GUIDE
21
DR-915L DATA RADIO
IN-SYSTEM CONFIGURATION
The DR-915L may be reconfigured while in a host system. This allows the users system to change the source or
destination address and group codes on-the-fly, adding great versatility to the Ack-Back™ delivery mode.
General Structure
The general structure of the protocol for programming the DR915L radios is as follows:
[0xAA] [command] [checksum] [0x55]
where command consists of byte #1, byte #2, byte #3, ..., byte #n as defined below, and
where the checksum is an 8-bit checksum (a simple unsigned 8-bit addition of bytes) of data bytes 1 thru n, 0x55,
and
where the checksum does not include the beginning 0xAA, itself, or the ending 0x55.
Numbers preceded by “0x” are hexadecimal. All others are decimal.
The DTR pin must be raised prior to sending any commands to the radio. Once a complete command has been sent
to the radio, the DTR pin should be immediately lowered. If a read command of some sort was issued, the device
should be ready to receive the information immediately. If a Write Command was issued, the device must allow 250
milliseconds for the radio to reboot itself with the new values before any other commands can be issued.
As bytes are sent to the radio, each byte will be immediately echoed back to the sender for confirmation that the
radio received the byte.
When any data is being read from the radio, the device should simply read in the data without echoing the bytes
back to the radio.