There are 16 Modbus registers allocated for each device in the wireless network. The first 16 registers (1–16) are allocated
for the Gateway, the next 16 (17–32) are allocated for Node 1, the next 16 (33–48) are allocated for Node 2 and so forth.
There are no inputs or outputs on the DXM embedded Gateway but the Modbus registers are still allocated for them.
Although only seven Nodes are listed in the table, the Modbus register numbering continues for as many Nodes as are in the
network. For example, the register number for Node 10, I/O point 15 , is 175. Calculate the Modbus register number for each
device using the equation:
Register Number = I/O# + (Node# × 16)
Table 6: Modbus holding registers
I/O Point
Gateway
Node 1
Node 2
Node 3
Node 4
Node 5
Node 6
Node 7
1
1
17
33
49
65
81
97
113
2
2
18
34
50
66
82
98
114
3
3
19
35
51
67
83
99
115
4
4
20
36
52
68
84
100
116
5
5
21
37
53
69
85
101
117
6
6
22
38
54
70
86
102
118
7
7
23
39
55
71
87
103
119
8
8
24
40
56
72
88
104
120
9
9
25
41
57
73
89
105
121
10
10
26
42
58
74
90
106
122
11
11
27
43
59
75
91
107
123
12
12
28
44
60
76
92
108
124
13
13
29
45
61
77
93
109
125
14
14
30
46
62
78
94
110
126
15
15
31
47
63
79
95
111
127
16
16
32
48
64
80
96
112
128
Table 7: Access all wireless network registers by reading Modbus slave ID 1
DX80 Device
Slave ID
Modbus Registers
DXM Gateway radio
1
Modbus registers 1–8 are inputs, 9–16 are outputs
Node 1
-
Modbus registers 17–24 are inputs, 25–32 are outputs
Node 2
-
Modbus registers 33–40 are inputs, 41–48 are outputs
Node 3
-
Modbus registers 49–56 are inputs, 57–64 are outputs
3.4.1 Alternative Modbus Register Organization
The Sure Cross DX80 Alternative Modbus Register Organization registers are used for reordering data registers to allow host
systems to efficiently access all inputs or outputs using a single Modbus command. The register groups include the input/
output registers, bit-packed registers, and analog registers. This feature is only available with the Performance models using
version 3 or newer of the LCD firmware code.
Table 8: Alternative Modbus register organization
Name
Modbus Register Address (Decimal)
Inputs and Outputs, in order by device
2201 through 4784
Discrete Bit Packed (Status, Discrete Inputs, Discrete Outputs)
6601 through 6753
Analog Inputs (1–8) and Analog Outputs (1–8)
6801 through 9098
Sure Cross
®
DXM700-Bx Wireless Controller
20
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