DS650-6 June ‘06

©2006 RF Solutions Ltd, www.rfsolutions.co.uk

Page 5

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RF650

3

Configuration

The configuration of the RF650 module may be changed by setting the Configuration pin low, then sending a

set of configuration data bytes to the module on the Tx pin.

Alternatively the Configuration software can be used to setup the module through a graphical interface, please

refer to section 3.1 for details on this.

Byte

Name

Description

Default Supplied Value

0

MSB

7E hex

1

7E hex

2

7E hex

3

Destination Address

LSB

7E hex

4

MSB

7E hex

5

7E hex

6

7E hex

7

RF650 Address

LSB

7E hex

8

RF Channel

100 kHz step offset from 422.4MHz

107 (433.1MHz)

0 = -10dBm

1 = -2dBm

2 = +6dBm

9

Tx Power

3 = +10dBm

0 (-10dBm)

10

Tx data packet size

1 – 31 bytes

30 bytes

11

Rx data packet size

1 – 31 bytes

30 bytes

The RF Channel is calculated as:

433 MHz working frequency: Config value (decimal) = (desired RF frequency - 422.4MHz) * 10

868 MHz working frequency: Config value (decimal) = [(desired RF frequency / 2) - 422.4MHz] * 10

Please Note, the calculated value must be converted into hexadecimal format.

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.