Michell Instruments Liquidew EExd User Manual page 75

Liquidew EExd User's Manual
The table below shows the data bytes in a
1 to 4 contain the address of the Liquidew EExd, Modbus function, starting register
address and the data value to be written. In this example a master sends FC18H to
address 0015H, to a Liquidew EExd with an address of 01H. The CRC is calculated using
the data in bytes 1 to 6.
Byte No
Write Single Register Request and Response
The normal response from the Liquidew EExd is to re-transmit the received message.
However, if the data within the message is incorrect then an exception response will be
transmitted.
Michell Instruments
Meaning
1 Slave Address
2 MODBUS function code
3 Starting Address MSB
4 Starting Address LSB
5 Data MSB
6 Data LSB
7 CRC Lo Byte
8 CRC Hi Byte
Write To Single Register
Value
01H
06H
00H
15H
FCH
18H
??H
??H
APPENDIX F
message. Bytes
67