RDF1-433 RF Solutions, RDF1-433 Datasheet - Page 5

• Manufacturer Part Number: RDF1-433
• Description: FM Receiver And Decoder Module
• Manufacturer: RF Solutions

Specifications of RDF1-433

• Modulation Type: FM
• Frequency Range: 433.92MHz
• Kit Contents: Module Docs
• Tool / Board Applications: Wireless Connectivity-ZigBee, RF, Infrared, USB
• Sensitivity: -103dBm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DS RDF-a Sept 08
Serial Data Output
The RDF1 has a serial data output. This outputs the serial number, button and battery
status of the transmitter encoder. This data may be fed directly to a microcontroller or
RS232 type driver circuit which may then be fed directly to a PC serial port.
Serial data is output initially and again every ½ second whilst data is being received from
the transmitter. i.e. this output is valid regardless of whether the Transmitter/Encoder has
been learnt to the RDF1 or not. The serial data packet contains a learn bit to show if an
encoder input is learnt.
Serial Data Format
Serial Data is sent every 1/2 second as a stream of 7 bytes at 9.6K baud. The serial data
format is: 8 data bits with 1 stop bit, no parity.
Serial data is output form the Decoder chip whenever a valid data packet from a
compatible RF Solutions transmitter/Encoder is received regardless of learn
Encoder Serial Number [NN]: made up of two 8-bit bytes where the most significant
byte is transmitted first.
This provides a total of 65,536 possible serial numbers.
Example:
Encoder Input Information [XX]: made up of two 8-bit bytes.
The high order byte is sent first representing inputs 16 down to 9 where the MSb is input
16 and the LSb is input 9.
The low order byte is sent next representing inputs 8 down to 1 where the MSb is input 8
and the LSb is input 1.
A bit at state 1 represents an encoder input as active.
Using this method inputs can be multiplexed giving maximum versatility.
Example:
N
12AB (hexadecimal) or 0001 0010 1010 1011 (binary)
00000000 00001000 - Shows input 4 active.
00000001 00000000 – Shows input 9 active
10000001 00000001 – Shows inputs 16, 9 and 1 active
N
RF R
©2008 REG No 277 4001, England.
X
X
ECEIVER
BAT $0D $0A
Output from Serial Data pin
D
ECODER
7 bytes of data transmitted
Line feed (last character)
Carriage return
Battery Status / Learn Status
Encoder Input information
Encoder serial number
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RDF1-433