Hitachi WJ200-001S Instruction Manual page 342

Data:
 A function command is set here.
 The data format used in the X200
format below.
Name of Data
Coil Binary data that can be referenced and changed ( 1 bit long)
Holding Register 16-bit data that can be referenced and changed
Function code:
Specify a function you want to make the inverter execute. Function codes available to
the X200 series are listed below.
2
Function
Code
0 1 h Read Coil Status
0 3 h Read Holding Resistor
0 5 h Write in Coil
0 6 h Write in Holding Register
0 8 h Loopback Test
0 F h Write in Coils
1 0 h Write in Registers
17ｈ
Read/Write Holding Registor
Error check:
Modbus-RTU uses CRC (Cyclic Redundancy Check) for error checking.
 The CRC code is 16-bit data that is generated for 8-bit blocks of arbitrary length.
 The CRC code is generated by a generator polynomial CRC-16 (X16+ X15+ X2+ 1).
Header and trailer (silent interval):
Latency is the time between the reception of a query from the master and transmission
of a response from the inverter.
 3.5 characters (24 bits) are always required for latency time. If the latency time
shorter than 3.5 characters, the inverter returns no response.
 The actual transmission latency time is the sum of silent interval (3.5 characters
long) + C078 (transmission latency time).
series is corresponding to the Modbus data
2
Maximum data size
Function
Description
Maximum number of
(bytes available data elements available
per message)
4 32 coils (in bits)
32 16 registers (in bytes)
2 1 coil (in bits)
2 1 register (in bytes)

4 32 coils (in bits)
32 16 registers (in bytes)
32 16 registers (in bytes)
B7
per message
