User`s manual

Western Reserve Controls 1782-JDM User’s Manual

PUB 24.0 PRELIMINARY

1 Overview

The 1782-JDM is a family of DeviceNet-to-Modbus interfaces that allows you to easily connect and integrate

a Modbus-capable device into a DeviceNet system.

The Modbus device’s real-time data is read and written as I/O by the DeviceNet Master via Polled I/O. The

devices set up parameters, if any, can be read and written with the Explicit Messaging technique. The 1782-

JDM will operate with any compliant DeviceNet master software system or other device.

The JDM is defined as a Communications Adapter device on the DeviceNet system. It has a 3-pin plug

connector to cable to the Modbus RS232 or RS485 interface port on the MODBUS DEVICE and a 5-pin

pluggable DeviceNet connector for connections to the DeviceNet network. The DeviceNet baud rate selection

is done automatically by the device when it is powered up on a network. The JDM has one assigned

DeviceNet address which is set by a 6-position DIP switch on the unit. Other parameters are software-

configurable and are changed from their default values by third-party DeviceNet configuration tools. Each

JDM has 2 standard green/red DeviceNet LED’s for module status and network status and two green LED’s

to indicate RS485 transmit and receive activity.

All the Modbus device parameters are accessible for read or write over DeviceNet via the JDM, which allows

the user the option of using DeviceNet tools and software to define or monitor these parameters in addition

to other off-the-shelf or custom software utility using the Modbus port connection.

KEY

0=RIGHT

TOGGLE

ARM

1=LEFT

1782-JDM

DeviceNet Converter

V+

CAN_H

CAN-L

V-

GND

ADDR

= 0

N/C

Figure 1-1 1782-JDM