User`s manual

Western Reserve Controls, Inc. 1782-JDC User’s Manual

1. Overview

The 1782-JDC is a family of DeviceNet-to-serial link communications gateways that provide a

flexible DeviceNet interface to a wide variety of ASCII devices. The JDC allows the user to

easily and conveniently connect and integrate peripheral products with RS232, RS422 or

RS485 serial ports into a DeviceNet system.

Using the JDC you may communicate with the connected peripheral devices in the same

fashion as the other DeviceNet products in the system. Data may be read/written using either

I/O polling or explicit messaging. Typically real-time data is read and written as I/O by the

DeviceNet Master via Polled I/O and parameters are read and written with the Explicit

Messaging technique.

The 1782-JDC is defined as a Communications Adapter device on the DeviceNet system. It

has a 3-pin plug connector for connection to RS232 (JDC-1) or RS485 (JDC-2) or a 5-pin plug

connector for connection to RS422/485 (JDC-4) interface port on your device and a 5-pin

pluggable DeviceNet connector for connections to the DeviceNet network. The device does

baud rate selection automatically when it is powered up on a network. The 1782-JDC has one

assigned DeviceNet address, which is set by a 6-position DIP switch on the unit. Other JDC

parameters are software-configurable and are changed from their default values by third-party

DeviceNet configuration tools. Each 1782-JDC has 2 standard green/red DeviceNet LED’s for

module status and network status and two green LED’s to indicate RS232/422/485 transmit

and receive activity.

The RS232 version may be used for point-to-point connection to a single serial device. The

RS422/485 version may be connected in a point-to-point fashion to a single device, or to

multiple devices in the standard RS422/485 convention.

The JDC is a general-purpose gateway that is completely device-independent. The JDC does

not interpret the data being transmitted across it, and so the transferred messages may

contain data of any nature or definition. This allows you to use the same device for a wide

variety of DeviceNet-serial interface applications.

This manual applies to 1782-JDC version 5.

Figure 1-1 1782-JDC