Narrow Band Radio Transceiver
WP-RF-RF650
Page 4 of 8
RF650 Configuration
The configuration of the RF650 module may be changed by setting the Configuration pin low and sending a
set of configuration data bytes to the module on the Tx pin.
The RF Channel is calculated as:
Configuration value = (desired RF frequency – 422.4MHz) * 10
The Configuration pin must be held low for at least the first byte to change the RF650 module into
configuration mode. If the Configuration pin is still low at the end of the configuration then the module will
send the current configuration back to the host. To retrieve the current configuration without changing any
options the host can send a single byte to the module and wait for the response.
It is not necessary to send all configuration bytes to the module, but all data sent must be valid. For example
to change the destination address the host may just send four bytes. Configuration data excluded from the
end of the data stream will be unchanged. The RF650 module will accept a short configuration after a 10ms
timeout after the last byte sent to the module, or when the RTS pin goes high. This allows for the host to
easily change the destination address of the RF data packet, thus enabling one RF650 to send individual
data to several different recipient modules.
A destination address of 00000000 will reset the RF650 to the default settings shown above.
RF data packets received by the RF650 with the embedded destination address which matches the RF650
address will be accepted, processed and passed to the host, all of the RF data packets will be ignored.
When configuring the destination or RF650 address an incorrect number of bytes for an address will leave
the current address unchanged.
An invalid Transmitter Power or Packet Size setting will leave the current setting unchanged.
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