ABB AnalyzeIT ZMT Series Додаткова інструкція з експлуатації - Сторінка 5

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3 INSTALLATION

3.1 Serial Communication

Adaptors for Personal Computers

An RS422/485 communications adaptor board is required for

serial links. It is strongly recommended that the card used has

galvanic isolation to protect the computer from lightning

damage and increase immunity from noise pick-up from

cables.

3.1.1 Configuration

The following OPTO22 boards are recommended for use with

the serial version of ZMT analyzers:

Part No.

Computer Type

AC24

XT Bus IBM PC compatible

AC24 AT

AT Bus IBM PC compatible

AC34

Microchannel IBM PC.

The following 'Jumper' selections are required on OPTO22

boards (usually supplied as the default configuration):

RX & TX

install line termination jumper

Install pull-up and pull-down

jumpers

CTS & RTS

Select board address and interrupts as described in the

OPTO22 manual.

Computer Terminal or

Host Computer

disable jumper installed.

Chain of ZMT Analyzers

Fig. 4.1 Schematic Diagram

Fig. 4.2 Serial Connections

4 ELECTRICAL CONNECTIONS

All

connections,

communication, are made as shown in Figs. 5.4 and 5.5 of the

Operating Instructions (IM/ZMT).

4.1 Serial Connections – Figs. 4.1 and 4.2

The transmitters must be connected in parallel as shown in the

schematic diagram – Fig. 4.1. The RS485 standard quotes

connection of maximum thirty two slaves (ZMT Analyzers) to

any single driver (computer terminal or host computer); the

RS422 standard quotes connection of up to ten slaves.

However, these numbers can be increased if the driver's serial

port permits.

Make serial data connections as shown in Fig. 4.2. The type of

cable used is dependent on the transmission speed and cable

length:

4.1.1 Cabling (refer also to Fig. 9.1 on page 13)

Up to 6m (all speeds) – standard screened or twisted pair

cable.

Up to 300m – twin twisted pair with overall foil screen and

an integral drain wire, e.g. Belden 9502 or equivalent

Up to 1200m – twin twisted pair with separate foil screens

and integral drain wires for each pair, e.g. Belden 9729 or

equivalent

Connected

Output Module 3

From PC

apart

from

those

for

Termination Resistor

(on ZMT receive input)

Last ZMT

in Chain

serial

data