4-171
4-4 Communication Function
4
Functions
<Writing Into the Holding Register [06h]>
Writes data into the specified holding register.
(Example)
Write 50 Hz into the Inverter with slave address 5 as the base frequency (A003).
The data resolution of the holding register "1203h" of the base frequency (A003) is 1 Hz. To set 50
Hz, set the change data to "50 (0032h)".
If writing into the holding register cannot be performed normally, refer to the "Exception Response"
section.
<Loop-back Test [08h]>
Used to check the communications between master and slave. A random value can be used for test
data.
(Example)
Loop-back test to the Inverter with slave address 1
The diagnostic sub code corresponds only with the query data echo (00h, 00h), not any other
commands.
Query Response
No. Field name
Example
(HEX)
No. Field name
Example
(HEX)
1 Slave address
*1
05 1 Slave address 05
2 Function code 06 2 Function code 06
3 Register start number (MSB)
*2
12 3 Register start number (MSB) 12
4 Register start number (LSB)
*2
02 4 Register start number (LSB) 02
5 Change data (MSB) 00 5 Change data (MSB) 00
6 Change data (LSB) 32 6 Change data (LSB) 32
7 CRC-16 (MSB) AD 7 CRC-16 (MSB) AD
8 CRC-16 (LSB) 23 8 CRC-16 (LSB) 23
*1. There is no response for broadcasting.
*2. Note that the start number is reduced by 1.
Query Response
No. Field name
Example
(HEX)
No. Field name
Example
(HEX)
1 Slave address
*
01 1 Slave address 01
2 Function code 08 2 Function code 08
3 Diagnostic sub code (MSB) 00 3 Diagnostic sub code (MSB) 00
4 Diagnostic sub code (LSB) 00 4 Diagnostic sub code (LSB) 00
5 Data (MSB) Random 5 Data (MSB) Random
6 Data (LSB) Random 6 Data (LSB) Random
7 CRC-16 (MSB) CRC 7 CRC-16 (MSB) CRC
8 CRC-16 (LSB) CRC 8 CRC-16 (LSB) CRC
* Broadcasting cannot be performed.
To Next Page
Loading...
