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Programming
8.2 Programming via Modbus
Reader-specific Modbus functions
You can perform the following functions via the Modbus interface:
• Read UID/tag fields
• Detect the presence of a transponder
• Read/write user data via preset tag fields
• Read/write user data via address and length
• Program reader LEDs
These functions are described below.
8.2.1
Register overview
The Modbus interface of the reader consists of Input and Holding registers (see table). You can
access these registers using the following Modbus functions:
• Read Holding Registers 3
• Write Single Register 6
• Write Multiple Registers 16
The registers need to be addressed accordingly depending on the function to be executed.
The following table provides an overview of the specific Modbus registers of the reader.
Table 8-1
Register
address
0
1
12
13
14
15
16
17
18
19
20
120
64
Register overview
Register
Register
quantity
name
1
Status
11
reserved
1
Tag field name
1
VHL File ID
1
Address Hi
1
Address Lo
1
Length
1
Command
1
reserved
1
Result
100
Data
1
LED Control
Data type
Word
Word
Word
Word
Word
Word
Word
Word
Word
Word
Word Data[0..99]
Word
Operating Instructions, 08/2023, C79000-G8976-C698-02
Access
R
--
R/W
R/W
R/W
R/W
R/W
R/(W)
--
R
R/W
R/W
SIMATIC RF1100
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