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
6631-6633
Input 3 from all devices
6711–6713
Output 3 from all devices
6641-6643
Input 4 from all devices
6721–6723
Output 4 from all devices
6651-6653
Input 5 from all devices
6731–6733
Output 5 from all devices
6661-6663
Input 6 from all devices
6741–6743
Output 6 from all devices
6671-6673
Input 7 from all devices
6751–6753
Output 7 from all devices
6681-6683
Input 8 from all devices
Status registers (6601-6603) contain a bit-packed representation defining the devices that are operational in the
wireless system.
Input registers from all devices use Modbus registers 6611 through 6683 to organize the least significant bit into a
sequential array of registers. The first register contains the least significant bit from the input values for the Gateway
through Node 15. The second register contains the input values for Node 16 through Node 31, and the third register
contains the input values for Nodes 32 through 47.
For discrete inputs, only the least significant bit is used. For analog inputs, the least significant bit indicates if the analog
value is above or below the selected threshold value (when using the threshold parameter). For example, a least
significant bit of one (1) indicates the analog value is above the selected threshold value. A least significant bit of zero (0)
indicates the analog value is below the threshold value.
DXM100-Bx Wireless Controller Instruction Manual
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