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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