4-159
4-4 Communication Function
4
Func
tions
Below is each frame format (command).
Message Configuration: Query
<Slave Address>
• Pre-set numbers ranging from 1 to 32 in each Inverter (slave). (Only the Inverter having the same
slave address as the query takes in the corresponding query.)
• Broadcasting can be performed by setting the slave address to "0".
• Data call or loop-back cannot be performed while broadcasting.
<Data>
• Sends the function command.
• The 3G3RX corresponds with the following data formats used in the ModBus.
<Function Code>
• Specifies the function for the Inverter to perform.
• Below are the function codes supported by the 3G3RX.
Function Code
<Error Check>
• CRC (Cyclic Redundancy Check) is used for the ModBus-RTU error check.
• The CRC code is a 16-bit data generated for the block of random length data in the 8-bit unit.
• To prepare the CRC code, use a generation polynomial of CRC-16 (X
16
+ X
15
+ X
2
+ 1).
Header (Silent interval)
Slave address
Function code
Data
Error check
Trailer (Silent interval)
Data name
Description
Coil
2-value data (1-bit long) that can be referred to or changed
Holding register
16-bit long data that can be referred to or changed
Function code
Function
Maximum number of
data bytes in 1 message
Maximum data number in
1 message
01h
Reading coil status
4
32 coils (in bits)
03h
Reading holding register
content
8
4 registers (in bytes)
05h
Writing into the coil
2
1 coil (in bits)
06h
Writing into the holding
register
2
1 register (in bytes)
08h
Loop-back test
⎯
0Fh
Writing into multiple coils
4
32 coils (in bits)
10h
Writing into multiple registers
8
4 registers (in bytes)
Summary of Contents for 3G3RX Series
Page 1: ...Cat No I560 E1 03 USER S MANUAL SYSDRIVE RXSERIES High function General purpose Inverter ...
Page 2: ......
Page 17: ...Chapter 1 Overview 1 1 Functions 1 1 1 2 Appearance and Names of Parts 1 4 ...
Page 22: ......
Page 23: ...Chapter 2 Design 2 1 Installation 2 1 2 2 Wiring 2 6 ...
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Page 337: ...Chapter 6 Inspection and Maintenance 6 1 Inspection and Maintenance 6 1 ...
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Page 437: ...Index ...
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