9 Communications Functions
9 - 6
High-function General-purpose Inverter RX2 Series User’s Manual
The format of a query frame (command) is as follows.
<Slave Address>
• A serial number from 1 to 32 preset for each inverter (slave). Only the inverter that matches the slave
address specified in the query will capture that query.
• Set the slave address to 0 to perform broadcasting (distributing a query to all slave addresses at a
time).
• During a broadcast, you cannot perform data call or loop-back operation.
<Function Code>
This specifies the function to be performed by the inverter.
Function Code
<Data>
• This sends the function command.
• The data format differs depending on the function code.
<Error Check>
• CRC (Cyclic Redundancy Check) is used for error checking.
• The CRC code is 16-bit data generated for any data block with a data length in 8-bit unit.
• For CRC code generation, the following generator polynomial is used: CRC-16 (X
16
+ X
15
+ X
2
+ 1).
Query Frame Configuration
Slave address
Function code
Data
Error check
Function code
Function
Maximum number of
data bytes per message
Maximum number of
coils/registers per message
01 hex
Reads out the state of coil
4
32 coils (bitwise)
03 hex
Reads out the content of retention
register
32
16 registers (in bytes)
05 hex
Writes to coil
2
1 coil (bitwise)
06 hex
Writes to retention register
2
1 register (in bytes)
08 hex
Loopback test
–
–
0F hex
Writes to multiple coils
4
32 coils (bitwise)
10 hex
Writes to multiple retention registers
32
16 registers (in bytes)
Data name
Description
Coil
Two values can be read and written (1 bit length).
Holding register
Data with 16 bit length can be read and written.
Summary of Contents for RX - 2
Page 1: ...High function General purpose Inverter RX2 Series User s Manual I620 E1 01 3G3RX2...
Page 54: ...1 Overview 1 22 High function General purpose Inverter RX2 Series User s Manual...
Page 136: ...2 Design 2 82 High function General purpose Inverter RX2 Series User s Manual...
Page 592: ...8 Applied Settings 8 192 High function General purpose Inverter RX2 Series User s Manual...
Page 754: ...11 Options 11 56 High function General purpose Inverter RX2 Series User s Manual...
Page 794: ...12 Troubleshooting 12 40 High function General purpose Inverter RX2 Series User s Manual...
Page 919: ......
