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Se
ct
io
n 7
Mo
dbus
Commun
ic
a
tion
s
Prot
ocol
Section 7
Host Communications Specifications
163
RFID System
User's Manual
(Modbus TCP)
Write Holding Register (10 Hex)
This function code is used to write continuous holding registers.
Example: Writing “1111222233334444” to Four Words 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
0F
7
Unit identifier
FF
8
Function code
10
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
13
Byte count
08
14
Write data 1 upper byte
11
15
Write data 1 lower byte
11
16
Write data 2 upper byte
22
17
Write data 2 lower byte
22
18
Write data 3 upper byte
33
19
Write data 3 lower byte
33
20
Write data 4 upper byte
44
21
Write data 4 lower byte
44
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
06
7
Unit identifier
FF
8
Function code
10
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