User`s manual

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

1.1 Features

The 1782-JDC has the following features:

• Translates messages and data between DeviceNet and a serial peripheral device

• ODVA Conformance tested to DeviceNet Spec 2.0

• Defined as a DeviceNet Communications Device Profile 12 (0x0C)

• Autobaud operation

• Polled I/O and Explicit Messaging

• Software Configurable Parameters for serial port operation

• Address selection via DIP switches

• DIN rail mount

• Pluggable 5-pin DeviceNet connection

• Pluggable RS485 3-pin connection

• 2 standard DeviceNet module and network status LED’s

• 2 serial transmit and receive LED’s

• Powered from DeviceNet 11-25 Vdc network power

• ASCII string length up to 255 bytes

• Serial port baud rate up to 38.4k baud

• Optional isolated RS485 interface

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 JDC. A typical system will include a master, such as a

PLC or industrial PC, and multiple slave devices, including a 1782-JDC with connected peripheral

devices.

1.3 Basic Operation

The JDC operates as the DeviceNet front-end to the serial device(s). Connecting the JDC to a

single device, that device can then be assigned by the system implementer to one specific

master. The DeviceNet Master can receive and send data to and from the 1782-JDC via the

methods described in this section. It formats and sends the data to the device and likewise

accepts responses from the device, which are reformatted and passed back to the DeviceNet

system as required.

The JDC has one DeviceNet address. All DeviceNet messages to the JDC itself (to read / write its

internal data) are sent to this address. All DeviceNet messages to and from the serial device are

sent to the JDC DeviceNet assembly objects using poll commands.

The JDC Parameter Object allows you to define the specific operation of each JDC. These

parameters include all the set-up required for the serial comm. link.

The following chart defines the various messaging methods used for “typical” data types at your

serial device.