User`s manual

Western Reserve Controls 1782-JDM User’s Manual

PUB 24.0

1.1 Features

The JDM has the following features:

• Translates messages and data between DeviceNet and ModBus devices

• Operates independently of ModBus device

• Forwards the message received without interpretation

• Each JDM communicates with one or more ModBus devices

• DeviceNet Autobaud operation

• Polled I/O

• Explicit Messaging

• All ModBus registers on target device are accessible

• Upgrades to the ModBus device do not require updates to the JDM

• Software Configurable Parameters for device operation

• Address selection via DIP switches

• DIN rail mount

• Pluggable 5-pin DeviceNet connection

• Pluggable RS232/RS485 3-pin connection or RS422 5-pin connection

• Choice of isolated RS232, RS485 or RS422 serial interface

• Standard DeviceNet module and network status LED’s

• Serial port transmit and receive LED’s

• Powered from DeviceNet network

1.1 Product Family Selection

There are 3 members of the 1782-JDC family:

o 1782-JDM-1 Isolated RS-232

o 1782-JDM-2 Isolated RS-485

o 1782-JDM-4 Isolated RS-422

1.2 DeviceNet System Architecture

A DeviceNet network is a distributed I/O system that may contain many different products from several

different vendors. Products may be configured uniformly, as clusters or as distributed clusters. Up to 64

devices, including the master, may be attached to a single DeviceNet network. Any of these, except the

master, may be a JDM. A typical system will include a master, such as a PLC or industrial PC, and

multiple slave devices, including a JDM with connected ModBus devices.