E+E Elektronik EE240 User Manual page 35

Wireless sensor network
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Please note: In the EE240, the Byte pairs 3 and 4 are not inverted with the byte pairs 1 and 2.
So for decoding, the sentence in chapter 7.2 of AN0103 is not valid!
Effect of byte order change (Main menu ► Management ► Modbus):
The Tx is the same (marked yellow, see below), but the response is different according the selection of
the Modbus byte order: MSB first (Big Endian) is the normal way. For decoding, the inversion of bytes
pair is not necessary (41 97 C2 8F)
If LSB (Little Endian) is selected, not only the byte pairs 1,2 /3,4 are inverted, but also the position of
byte 1,2 and 3,4 are swapped. So inversion of byte order and position is required for correct decoding
(41 97 C2 8F).
Important note for communication via Modbus TCP:
After reading a value, the connection must be closed before reading the next one.
35
User Manual EE240 Wireless Sensor Network

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