7 DXM Modbus Registers
The DXM100 Controller may have up to four internal Modbus slave devices:
DXM Internal Modbus Slave IDs (factory default)
Modbus Slave ID
Device
1
Gateway (PE5) or MultiHop (HE5) ISM Radio—MultiHop wireless devices connected to the internal MultiHop radio should
be assigned Modbus Slave addresses starting at 11.
199
Local Registers—Internal storage registers of the DXM Controller
200
I/O Base Board—All data and parameters for each input or output of the DXM Controller.
201
LCD Display—The user has access to the LED indicators on the DXM Controller.
All Modbus registers are defined as 16-bit Modbus Holding Registers. When connecting external Modbus slave devices, only
use Modbus slave IDs 2 through 198. The local registers, the I/O base, and the LCD slave IDs are fixed, but the internal
radio slave ID can be changed if needed.
7.1 Gateway Performance 1 Watt Radio
The DX80 Gateway (PE5) is a star-based architecture device that contains all the Modbus registers for the wireless
network within the Gateway. To access any input or output values within the entire wireless network, read the appropriate
Modbus register from Gateway.
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 3: 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
Example: DX80 Performance Gateway Modbus Register Table
Access all wireless network registers by reading Modbus slave ID 1.
DXM100 Controller Instruction Manual
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