User`s manual

Western Reserve Controls 1782-JDM User’s Manual

PUB 24.0

4 DeviceNet I/O Assembly Formats

The following tables define the format of the DeviceNet data sent to and received from the JDM. The

exact format of the output and input data that is sent from and received at your DeviceNet master is

defined by the Modbus command used. The following tables provide the general format and illustrate the

differences between the ASCII and RTU modes. Review the Modbus spec or your Modbus device’s user’s

manual for more details.

4.1 Output Data, Modbus Command

Table 4-1 I/O Assembly Object Instance 2 Data Format – Command

Byte

(Offset value)

Data

0 Record number

1 Address

2 Command

3 Data www – LSB

4 Data www – MSB

5 Data xxx – LSB

6 Data xxx – MSB

…

N Last data – LSB

N + 1 Last data – MSB

4.2 Input Data, Modbus Response

The exact format of the input data that is received at your DeviceNet master is defined by the

Modbus command used. The following tables provide the general format and illustrate the differences

between the ASCII and RTU modes. Review the Modbus spec or your Modbus device’s user’s manual for

more details.