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Input Registers and Outputs Registers
Modbus registers 2201 through 2584 are used to organize all inputs together. In this format, users can sequentially read all
input registers using one Modbus message. Modbus registers 4401 through 4784 organize all outputs together to allow
users to sequentially write to all outputs registers using one Modbus message.
Inputs (2201–2584)
Outputs (4401–4784)
Modbus Register Address (Dec) 16-bit Register Value
Modbus Register Address (Dec) 16-bit Register Value
2201–2208
Gateway Inputs 1 through 8
4401–4408
Gateway Outputs 1 through 8
2209–2216
Node 1 Inputs 1 through 8
4409–4416
Node 1 Outputs 1 through 8
2217–2224
Node 2 Inputs 1 through 8
4417–4424
Node 2 Outputs 1 through 8
...
...
...
...
2577–2584
Node 47 Inputs 1 through 8
4777–4784
Node 47 Outputs 1 through 8
Refer to your device's datasheet for a list of the active inputs and outputs. Not all inputs or outputs listed in this table may
be active for your system.
Discrete Bit-Packed Registers
Discrete bit-packed registers include the discrete status registers, discrete inputs, and discrete outputs.
Bit packing involves using a single register, or range of contiguous registers, to represent I/O values.
When networks use similar Nodes to gather data using the same I/O registers for each Node, discrete data from multiple
Nodes can be bit packed into a single register on the Gateway. The bit-packed data is arranged by I/O point starting at
Modbus register 6601. For example, Discrete IN 1 for all the Nodes in the network is stored in three contiguous 16-bit
registers.
The most efficient way to read (or write) discrete data from a SureCross
®
DX80 Gateway is by using these bit-packed
registers because users can read or write registers for all devices using one Modbus message. The following registers
contain discrete bit-packed I/O values for the Gateway and all Nodes. Values are stored first for the Gateway, then for each
Node in order of Node address.
Bit-Packed Device Status Registers
Bit Position
Register Address
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
6601
Node 15 Node 14 Node 13 Node 12 Node 11
Node 10
Node 9
Node 8
Node 7
Node 6
Node 5
Node 4
Node 3
Node 2
Node 1
Gateway
6602
Node 31 Node 30 Node 29 Node 28 Node 27 Node 26 Node 25 Node 24 Node 23 Node 22 Node 21 Node 20 Node 19 Node 18 Node 17 Node 16
6603
Node 47 Node 46 Node 45 Node 44 Node 43 Node 42 Node 41 Node 40 Node 39 Node 38 Node 37 Node 36 Node 35 Node 34 Node 33 Node 32
Bit-Packed Discrete Input 1
Bit Position
Register Address
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
6611
Node 15 Node 14 Node 13 Node 12 Node 11
Node 10
Node 9
Node 8
Node 7
Node 6
Node 5
Node 4
Node 3
Node 2
Node 1
Gateway
6612
Node 31 Node 30 Node 29 Node 28 Node 27 Node 26 Node 25 Node 24 Node 23 Node 22 Node 21 Node 20 Node 19 Node 18 Node 17 Node 16
6613
Node 47 Node 46 Node 45 Node 44 Node 43 Node 42 Node 41 Node 40 Node 39 Node 38 Node 37 Node 36 Node 35 Node 34 Node 33 Node 32
Bit-Packed Discrete Output 1
Bit Position
Register Address
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
6691
Node 15 Node 14 Node 13 Node 12 Node 11
Node 10
Node 9
Node 8
Node 7
Node 6
Node 5
Node 4
Node 3
Node 2
Node 1
Gateway
6692
Node 31 Node 30 Node 29 Node 28 Node 27 Node 26 Node 25 Node 24 Node 23 Node 22 Node 21 Node 20 Node 19 Node 18 Node 17 Node 16
6693
Node 47 Node 46 Node 45 Node 44 Node 43 Node 42 Node 41 Node 40 Node 39 Node 38 Node 37 Node 36 Node 35 Node 34 Node 33 Node 32
Inputs
Outputs
Modbus Register
Address (Decimal)
Description (Inputs)
Modbus Register
Address (Decimal)
Description (Outputs)
6601-6603
Status for all devices
6611-6613
Input 1 from all devices
6691–6693
Output 1 from all devices
6621-6623
Input 2 from all devices
6701–6703
Output 2 from all devices
Sure Cross
®
DXM700-Bx Wireless Controller
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