Ziegler mfm 3480, Руководство пользователя

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Each setting is held in the 4X registers .ModBus code 03 is used to read the current setting
and code 16 is used to write/change the setting. Refer
Table 5
for 4 X Register addresses.
Example : Reading CT Secondary
System type : Start address= 2A (Hex) Number of registers = 02
Note :Number of registers = Number of Parameters x 2
Accessing 4 X register for Reading & Writing :
43
Query :
Start Address High : Most significant 8 bits of starting address of the parameter requested.
Start Address low :Least significant 8 bits of starting address of the parameter requested.
Number of register Hi : Most significant 8 bits of Number of registers requested.
Number of register Lo : Least significant 8 bits of Number of registers requested.
(Note : Two consecutive 16 bit register represent one parameter.
)
Device Address
Function Code
Start Address High
Start Address Low
Number of Registers Hi
Number of Registers Lo
CRC Low
CRC High
01 (Hex)
03 (Hex)
00 (Hex)
2A (Hex)
00 (Hex)
02 (Hex)
E5 (Hex)
C3 (Hex)