CEL-MAR ADA-1020 Manuale d'uso - Pagina 5

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ADA-1020

TX+

I= 0 / 20mA

I= -20 / +20mA

TX-

Transmitter - Active

Fig 2. The diagram of the transmitter & receiver Current Loop ADA-1020 Converter

2.5. ISOLATION

The ADA-1020 converter has 3-way, 1kV= or 3kV= galvanic isolation, depend on version described in section VERSIONS.

3. INSTALLATION

This chapter will show you how to connect ADA-1020 to RS232 device, current loop line and power supply.

In the purpose of minimization of disruptions from environment is being recommended to:

● apply multipair type shielded cables, which shield can be connected to the earthing on one end of the cable,

● arrange signal cables in the distance not shorter than 25 cm from powering cables.

● apply cable of adequate cross-section due to voltage drops for converter powering,

● not supply converter from power circuit device that generates large impulse interference such as transmitters, contactors,

3.1. ASSEMBLING

The ADA-1020 enclosure is adapted to assembly on TS-35 (DIN35) rail. To install repeater you should mount device on the rail upper

part of the enclosure then press bottom part to to hear characteristic „Click" sound.

3.2. CONNECTION OF DEVICES WITH RS232

TX+

I= 0 / 20mA

TX-

Transmitter - Passive

3-WAY ISOLATION

RS232

Power Supply

10 - 30VDC

Fig 3. Insulation structure at ADA-1020

Not use RI 9

Not use RTS 8

Not use CTS 7

Not use DTR 6

The Signals looped on the converter :

1. DTR – DSR – DCD

2. RTS - CTS

Fig 4. RS232 interface signals in DB-9Female

R=560W / R=1000W

RX+*

RX+

RX-

Receiver

Current Loop

5 GND

4 DSR not use

3 RX

2 TX

1 DCD not use