4 modbus rtu and modbus/tcp register map – Banner SureCross DX80 Wireless Networks User Manual
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2.4 Modbus RTU and Modbus/TCP Register Map
Modbus/TCP and Modbus RTU provide device control and monitoring using holding registers in the 40000 register block.
Each wireless device in the system is allocated 16 holding registers. The Gateway uses the first 16 registers followed by
each Node in the network, based on the Node address. For Node 5, the starting Modbus registers are 1 + (Node# Ч 16) =
1 + (5 Ч 16) = 81, the ending register is 97.
I/O Point
Gateway Modbus Holding Register
Node Modbus Register
1
1
1 + (Node# × 16)
2
2
2 + (Node# × 16)
3
3
3 + (Node# × 16)
4
4
4 + (Node# × 16)
5
5
5 + (Node# × 16)
6
6
6 + (Node# × 16)
7
7
7 + (Node# × 16)
8
8
8 + (Node# × 16)
9
9
9 + (Node# × 16)
10
10
10 + (Node# × 16)
11
11
11 + (Node# × 16)
12
12
12 + (Node# × 16)
13
13
13 + (Node# × 16)
14
14
14 + (Node# × 16)
15
15
15 + (Node# × 16)
16
16
16 + (Node# × 16)
For example:
Registers Device and Input
Connections
Register
Device and Input
Connections
Register
Device and Input
Connections
1
Gateway I/O 1
17
Node 01 I/O 1
33
Node 02 I/O 1
2
Gateway I/O 2
18
Node 01 I/O 2
34
Node 02 I/O 2
3
Gateway I/O 3
19
Node 01 I/O 3
35
Node 02 I/O 3
4
Gateway I/O 4
20
Node 01 I/O 4
...
...
5
Gateway I/O 5
21
Node 01 I/O 5
...
...
6
Gateway I/O 6
22
Node 01 I/O 6
...
...
7
Gateway I/O 7
23
Node 01 I/O 7
...
...
8
Gateway I/O 8
24
Node 01 I/O 8
...
...
9
Gateway I/O 9
25
Node 01 I/O 9
761
Node 47 I/O 9
10
Gateway I/O 10
26
Node 01 I/O 10
762
Node 47 I/O 10
11
Gateway I/O 11
27
Node 01 I/O 11
763
Node 47 I/O 11
12
Gateway I/O 12
28
Node 01 I/O 12
764
Node 47 I/O 12
13
Gateway I/O 13
29
Node 01 I/O 13
765
Node 47 I/O 13
14
Gateway I/O 14
30
Node 01 I/O 14
766
Node 47 I/O 14
Host Controller Systems
8