Sure Cross ® Dx80 Modbus Register Definitions; Modbus Holding Registers - Banner Sure Cross DX80 Instruction Manual

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Sure Cross Radio Networks and Host Controller Systems
2 Sure Cross
Modbus distinguishes between inputs and outputs and between bit-addressable and word addressable data items.
For more information, please refer to
data types is using a mapped address structure.
Reference Description
0xxxx Read/Write Discrete Output—Drives output data to a discrete output point.
1xxxx Read Discrete Inputs—Controlled by the corresponding discrete input point.
3xxxx Read Input Registers—Contains a 16-bit number received from an external source, like an analog signal.
Read/Write Output or Holding Registers—Stores 16-bits of numerical data (binary or decimal), or sends the data to an output
4xxxx
point.
The xxxx represents the four-digit address location in user data memory. Because function codes generally denote the
leading character, the leading character is omitted from the address specifier for a given function. The leading character
also identifies the I/O data type. The Sure Cross DX80 Modbus registers are all holding registers 4xxxx using the mapped
address structure.

2.1 Modbus Holding Registers

There are sixteen Modbus holding registers for each SureCross
device using the equation: Register number = I/O# + (Node# × 16).
Because the Gateway is always first, at Node 0, the Gateway's holding registers are registers 1 through 16. Registers for
Node 1 are 17 through 32, as shown in the Modbus Holding Register table below. Although only 10 Nodes are shown, the
table can continue for as many Nodes as are used in a given network.
Using the equation or the Modbus Holding Registers table, the register number for I/O point 15 for Node 7 is 127.
I/O Pt. Gateway
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
10 10
11 11
12 12
13 13
14 14
15 15
16 16
4
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DX80 Modbus Register Definitions
www.modbus.org
Modbus Holding Registers
Node 1 Node 2 Node 3
17 33
18 34
19 35
20 36
21 37
22 38
23 39
24 40
25 41
26 42
27 43
28 44
29 45
30 46
31 47
32 48
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. A less documented but commonly used method to separate the
™
device. Calculate the holding register number for each
Node 4 Node 5
49 65 81
50 66 82
51 67 83
52 68 84
53 69 85
54 70 86
55 71 87
56 72 88
57 73 89
58 74 90
59 75 91
60 76 92
61 77 93
62 78 94
63 79 95
64 80 96
Node 6 Node 7 Node 8
97 113
98 114
99 115
100 116
101 117
102 118
103 119
104 120
105 121
106 122
107 123
108 124
109 125
110 126
111 127
112 128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144