GridConnect NET485, Manual

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Introduction
NET485 User Guide 2-1
2. Introduction
The NET485 product allows you to connect an RS422/RS485 device to the Ethernet. Using RS485 two-wire
mode, you can connect the NET485’s serial interface to multiple devices in a multi-drop network.
To quickly setup the NET485, please refer to the Quick Start Guide. This section discusses the general
details of the NET485.
Terminator Jumpers
RS422/485 Terminals
Power Terminals
Ethernet Connection
Power LED
Figure 5 - Main Features
2.1 Typical Connections
Many electronic devices use the RS422/485 interface for its ability to connect equipment over long
distances. The interface design provides for multiple units to connect in a multi-drop protocol. The wiring
for these types of networks helps reduce noise and provides for reliable communications. However, the
distances are limited to about 4000 feet.
The NET485 allows you to connect an RS422/485 device to the Internet so that you can connect to the
device from anywhere there is an Internet connection. Many industrial computers have an RS422/485
interface to connect to their control systems. The software generally connects to one of the communication
ports such as COM1. You can still use the same software with the NET485 by installing Com Port
Redirector software.
Com Port Redirector v.4 (CPR), is a software utility for network-enabling software applications that do not
have network support. Com Port Redirector installs virtual communication ports; these communication
(com) ports are redirected over a network to the serial port of a device server.
The drawing shows a PC running Com Port Redirector software. When you run your application software,
you can now pick a virtual com port instead of a physical port. Instead of a cable running from the PC to the
RS485 device, you can now connect to it through a virtual com port and the NET485.
NET485
RS485
DEVICE
ETHERNET
PC
PC with Comm Port Redirec tor
Virtual COM Port