SOMFY 1810803 Guia De Instalacion página 60

Example
Steps to follow to create a correct data frame :
1. Create frame with values as indicated in the tables above => «raw data»
2. Invert all data bytes => «actual data»
3. Calculate the checksum on «actual data» (sum of all inverted bytes)
4. Data to send are the concatenation of «actual data» and checksum
Steps to follow when receiving data from a product :
1. Received data are the concatenation of «actual data» and checksum
2. Remove the last 2 bytes to isolate the checksum and get «Actual data»
3. Invert all remaining data bytes to get the «raw data»
The following examples show the data to send on the bus for different message types.
Examples are given for a communication between a host and a slave using the following
addresses :
Host@ = FF:FF:00
Slave@ = 05:00:02
58
(FF FF 00 <= @ <= FF FF FE for a non-SOMFY host)
(See NodeID label on product)
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