CEL-MAR ADA-4044H Manuale d'uso - Pagina 5

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ADA-4044H

2.1. ISOLATION

HUB ADA-4044H has 2-way or 3-way and 1kV= or 3kV= galvanic isolation (depend on version, described in section VERSIONS).

2-WAY ISOLATION

RS485/RS422

Power supply

This chapter will show how to connect ADA-4044H to RS485/422 bus and power supply and how to use it.

To reduce disturbance from environment, it is recommended to:

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

– use the suitable diameter cable for power supply on account of voltage drop,

– use the powering cable with a suitable section because of the voltage drops,

– use the interference eliminators for powering the converter,

– lay signal cables at a distance of not less than 25 cm away from power cables,

– not powering the converters form the power-circuit of devices generate large impulse disturbance like contactors, relays, inverters.

ADA-4044H converter case is adapted to assembly on TS-35 (DIN35) rail. To install converter should mount device on the rail upper

part of the case then press bottom part to hearing characteristic „Click" sound.

RS485/RS422 interface at ADA-4044H is available on terminal block described as: Tx+/A, Tx-/B, Rx+, Rx- (IN) and T1+/A1, T1-/B1,

R1+/A2, R1-/B2, T2+/A3, T2-/B3, R2+/A4, R2-/B4 (OUT). Both buses need proper cabling.

Connection the GND terminal of RS485/422 interfaces, connected devices to RS485/422 bus, should be done in case of potential

difference, which makes data transmission is improper .

3.2.1. STAR TYPE CONNECTION FOR 4-WIRE RS485 BUS – CONFIGURATION OF 2-PORT

RS485-OUT

Using the ADA-4044H configured for operating with 2-port, 4-wire RS485 (the microswitch RS-485 PORT in position 4W), it's possible

to:

- connect up to 64 devices with 4-wire RS485 interface in 'star',

- extend the main bus by a further segments of 1200m,

- separate other segments of bus from main network – what increases the operational reliability,

- amplify the RS485 signal.

During the connecting, pay attention to the proper implementation of the connection according to the following drawings.

OUT

RS485/RS422

10 - 30VDC

Fig 2. Insulation structure

3-WAY ISOLATION

RS485/RS422

OUT

RS485/RS422

Power supply

10 - 30VDC