ALPHA Encoder / Decoder IC’s
RF803-ALPHA
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: 00000000 00001000 - Shows input 4 active.
00000001 00000000 – Shows input 9 active
10000001 00000001 – Shows inputs 16, 9 and 1 active
Status [STAT]: The status byte is made up of an 8-bit byte as follows:
BIT
Bit-7 down to 2
Bit 1
Description
Reserved
Details
For future usage
1 = encoder has been learnt
0 = Always
Learn status
Not Used
Bit 0
Example: 00000010 = encoder battery ok, encoder has been learnt
00000001 = encoder battery low, encoder has not been learnt
Carriage Return [CR] and Line feed [LF]
To mark the end of the serial packet ascii characters for carriage return (hex 0D) are sent
followed by LF (hex 0A).
Custom Versions
Custom versions of the RF803E-ALPHA / RF803D-ALPHA chipset are available to provide a
bespoke remote chipset for OEM applications. Please contact our sales department for further
information.
*NOTE: Serial Data output is common across the entire RF80n range, therefore up to 16
inputs states are sent. When using encoders with lower numbers of inputs the un-used
bits are set to 0.
R. F. Solutions Ltd.,
Unit 21, Cliffe Industrial Estate,
Lewes, E Sussex, BN8 6JL, England
Tel +44 (0)1273 898 000
Fax +44 (0)1273 480 661
Email sales@rfsolutions.co.uk
http://www.rfsolutions.co.uk
All Trademarks acknowledged and remain the property of the respected owners.
Information contained in this document is believed to be accurate, however no representation or warranty is given and R.F. Solutions Ltd. assumes no liability with respect to the accuracy of such
information. Use of R.F. Solutions as critical components in life support systems is not authorised except with express written approval from R.F.Solutions Ltd.
DS803-ALPHA-1 Nov ‘09
©2008 RF Solutions Ltd, www.rfsolutions.co.uk
Tel 01273 898000 Fax 01273 480661
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