FAURE HERMAN FH8400, User Manual

Page: 68 / 111

F H 8 4 0 0
66
66 66
66 TEC 07.07.04/ 412521
Revision index F
08/07/2013
127
23
2
2
1 ) 1 (
−
⋅






+ − =
E S
M
V
Example: Given the value 40.21.80.40h
0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 1
1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0
(S = 0, E = 128, M = 218040h = 2195520)
9 2,52345275 2
2
2195520
1 1) ( V
127 128
23
0
= ⋅






+ − =
−
Data are put in the tables starting with the most significant byte
(MSB), except for the CRC 16 control word which is transmitted
beginning by the least significant byte.
The Modbus functions accepted by the FH8400 are the function 3
(reading of n words) and the function 16 (writing of n words).
Framework for the reading of "n" Modbus words (1
≤
n
≤
125)
Request
Slave
number
Function
code (3)
Address of
the 1st
word
Number of
words (n)
CRC16
Control
1 byte 1 byte 2 bytes 2 bytes 2 bytes
Response
Slave
number
Function
code (3)
Number of
read bytes Value of
the 1st
word
Value of
the last
word
CRC16
Control
1 byte 1 byte 1 byte 2 bytes 2 bytes 2 bytes