Omron V680 Series User Manual

162
Section 7 Modbus Communications Protocol
RFID System
User's Manual
(Modbus TCP)
Section 7
Host Communications Specifications
Function Code Descriptions
 Read Holding Register (03 Hex)
This function code is used to read the contents of the specified number of continuous holding registers
starting from the specified address.
 Example: Reading Four Words of Data Starting from Address 1234 Hex in the
RF Tag
Query
The address in the RF Tag is the same as the register address.
Response
No. Field name
Example
(hex)
1 Transaction identifier upper byte 00
2 Transaction identifier lower byte 00
3 Protocol identifier upper byte 00
4 Protocol identifier lower byte 00
5 Field length upper byte 00
6 Field length lower byte 06
7 Unit identifier FF
8 Function code 03
9 Register address upper byte (See note 1.) 12
10 Register address lower byte (See note 1.) 34
11 Word count upper byte 00
12 Word count lower byte 04
RF Tag address = Register address
No. Field name
Example
(hex)
1 Transaction identifier upper byte 00
2 Transaction identifier lower byte 00
3 Protocol identifier upper byte 00
4 Protocol identifier lower byte 00
5 Field length upper byte 00
6 Field length lower byte 0B
7 Unit identifier FF
8 Function code 03
9 Byte count 08
10 Read data 1 upper byte 11
11 Read data 1 lower byte 11
12 Read data 2 upper byte 22
13 Read data 2 lower byte 22
14 Read data 3 upper byte 33
15 Read data 3 lower byte 33
16 Read data 4 upper byte 44
17 Read data 4 lower byte 44

Omron V680 Series Specifications

General

Brand	Omron
Model	V680 Series
Category	Other
Language	English