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MessengerBLE
User Guide
9.14
MODBUS Configuration – Type 18
Parameters for MODBUS Configuration
Parameter
Code
Reference Description
Default
1
Name
A name representative of this data
register type
Channel
Specific
ASCII Text
30 characters max
2
Enable
Enable
Channel
Specific
0 = disabled
1 = disabled
20
Slave ID
Modbus ID of slave unit
-1
Range -1 to 255
-1,0 = disabled
1-227 = for direct connect slave devices
228-239 = reserved
240-255 = for peer to peer devices
22
Modbus
Function
Code
Defines the type of data register to
read/write in the slave.
None [0]
0 – None
1 – Read Coil (1-bit)
2 – Read Status (1-bit)
3 – Read Holding (16-bit)
4 – Read Input (16-bit)
5 – Write Coil (1-bit)
6 – Write Holding (16-bit)
15 – Write Multiple Coil (1-bit)
16 – Write Multiple Holding (16-bit)
21
Register
Number
Register number in slave to read/write
1
Range 1 – 65535
21
Register
Type
0
Range 0 – 7
0 = 16-bit register (native MODBUS
register)
1 = 32-bit register
2 = 1-bit from 16-bit register
3 = 1-bit from 32-bit register
4 = bit-packed 16-bit register
5 = bit-packed 32-bit register
6 = float value from 32-bit register
7 = double precision 32-bit register
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