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February 02, 2024

DXM1200-X2 Controller Instruction Manual

Discrete bit-packed registers for inputs and outputs

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. Each bit indicates Node in Sync (1) or Node Not in Sync (0).

A one (1) written to the Discrete Status Register area indicates the device is active within the wireless system. A zero (0)
indicates the device is not active within the wireless network.

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 configured in the User
Configuration Software). 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.

Output registers from all devices use Modbus registers 6691 through 6753 to organize the least significant bit into a
sequential array of registers. Output 8 (I/O point 16) cannot be written using the discrete format.

Analog 16-Bit Registers (Registers 6801 through 9098)

The most efficient way to read (or write) analog data from a Gateway is by using these 16-bit analog registers. Most networks
consist of similar Nodes reporting data using the same I/O registers for each Node. For this reason, the analog data is
arranged by I/O point using Modbus registers 6801 through 9098.

For example, Input 1 for Gateway and all Nodes is stored in the first 48 contiguous blocks of 16-bit analog registers,
beginning with register 6801.

In this format, users can read a 16-bit holding register for all devices or write to a register for all devices using one Modbus
message. Using these registers is the most efficient way to read all status registers, read all analog inputs, or write all analog
outputs.

The following registers contain analog 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.

Analog input and output registers

Inputs

Outputs

Modbus Register Address

(Decimal)

Description (Inputs)

Modbus Register Address

(Decimal)

Description (Outputs)

6801

Input 1 for Gateway

8001