User`s manual

Western Reserve Controls 1782-JDM User’s Manual
PUB 24.0 PRELIMINARY
1
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-
RX
TX
GND
ADDR
= 0
N/C
Figure 1-1 1782-JDM
1.1 Features
The JDM has the following features:
•
Translates messages and data between DeviceNet and Modbus devices