Omron RX User Manual page 270

4-4 Communication Function
<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)".
Query
No.
1 Slave address
4
2 Function code
3 Register start number (MSB)
4 Register start number (LSB)
5 Change data (MSB)
6 Change data (LSB)
7 CRC-16 (MSB)
8 CRC-16 (LSB)
*1. There is no response for broadcasting.
*2. Note that the start number is reduced by 1.
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
Query
No. Field name
1 Slave address
2 Function code
3 Diagnostic sub code (MSB)
4 Diagnostic sub code (LSB)
5 Data (MSB)
6 Data (LSB)
7 CRC-16 (MSB)
8 CRC-16 (LSB)
* Broadcasting cannot be performed.
The diagnostic sub code corresponds only with the query data echo (00h, 00h), not any other
commands.
4-165
Example
Field name
(HEX)
*1
*2
*2
Example
(HEX)
*
01
08
00
00
Random
Random
CRC
CRC
Response
No.
05 1 Slave address
06 2 Function code
12 3 Register start number (MSB)
02 4 Register start number (LSB)
00 5 Change data (MSB)
32 6 Change data (LSB)
AD 7 CRC-16 (MSB)
23 8 CRC-16 (LSB)
Response
No.
1 Slave address
2 Function code
3 Diagnostic sub code (MSB)
4 Diagnostic sub code (LSB)
5 Data (MSB)
6 Data (LSB)
7 CRC-16 (MSB)
8 CRC-16 (LSB)
Example
Field name
(HEX)
05
06
12
02
00
32
AD
23
Example
Field name
(HEX)
01
08
00
00
Random
Random
CRC
CRC