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EIA-485 Network

The MicroDIN EIA-485 (RS-485) Network Characteristics

An EIA-485 interface uses three wires in a half-duplex configuration.

The EIA-485 standard specifies a T+/R+ line; a T-/R- line; and a common line.

EIA-485 interprets a -5 volt signal <None> as a 1, a +5-volt signal as a 0. Up to

32 remote devices can be connected to a master on a multi-drop network up to

4,000 feet long.

For industrial networks, EIA-485 offers low impedance, a multiple-device

capability, strong noise immunity and the long distance capability.

PC Connection via 232/485 Converter

Watlow recommends connecting the MicroDIN to your personal computers with

an EIA-232 (RS-232) to EIA-485 (RS-485) converter.

The 232-to-485 converters are proven reliable, low cost, and readily available.

We recommend these suppliers:

• B & B Electronics Manufacturing Company

707 Dayton Road, PO Box 1040, Ottawa, IL 61350

Tel: (815) 433-5100; Fax: (815) 434-7094; Web: http://www.bb-elec.com

Request part number: 485OIC with a power supply and the correct 25-pin

gender connector for your computer.

• CMC (Connecticut microComputer, Inc.)

P.O. Box 186, Brookfield, CT 06804

Tel: (800) 426-2872, (203) 740-9890; Fax: (203) 775-4595

Request part number: ADA485L with the correct 25-pin gender connector

for your computer.

See Chapter 3

for wiring details.

Watlow MicroDIN 2.3

Communications

Setup

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Watlow MICRODIN Bedienungsanleitung Seite 13