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4 Watlow MicroDIN Quick Start Guide

Communications Overview

EIA-485 Network

The MicroDIN uses the EIA-485 (formerly, “RS-485”) hardware interface to com-

municate with three wires in a half-duplex configuration, up to 32 remote

devices with a master unit on a network up to 4,000 feet long using 14-26 gauge

wire.

Modbus

™

Protocol

The MicroDIN uses Modbus

™

RTU protocol to read and write to registers that

can be viewed or changed from a personal computer. Each MicroDIN ‘parameter’

has a corresponding Modbus

™

meter register numbers and the order of priority appear later in this chapter.

Chapter 5 details all the MicroDIN parameters, and the Appendix provides infor-

mation on how to write custom Modbus

™

applications

Set Address/Baud Rate

You must configure the communications speed and network address of the

MicroDIN controller with the eight-bit DIP switch on the top of the unit. Set the

controller address with the first six switches and the network speed (9,600 or

19,200 baud) with the eighth switch. Turn to the DIP switch page 6.

Serial Data Format

The MicroDIN uses the an 8-N-1 data format; 8 data bits, no parity, 1 stop bit,

and 1 start bit. See the data format table later in this chapter.

Wiring Tasks

In addition to wiring the controller’s input, outputs and power connections, you

must also wire the EIA-232-to-EIA-485 converter; connect your computer to the

MicroDIN, and connect the MicroDIN communications daisy chain. See

“Communications Wiring” on pages 14 and 15.

Communications Software

Watlow offers a Windows application for MicroDIN, called, WATVIEW

which

will both set up and run multiple MicroDINs over an EIA-485 network using the

Modbus

™

protocol. For more information on WATVIEW

TM,

, go to www.watlow.

com/products/software.

You may also write your own application (see Appendix for more detail), or pur-

chase any of several available Modbus-capable control software packages.

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