Hardware Manual

Saia-Burgess Controls AG

Hardware Manual PCD 1 / PCD 2 Series│Document 26 / 737│Edition EN 15│2008-07-22

Communication interfaces

4

RS 422 with PCD2.F520

Connection diagram for RS 485 line termination resistors

+5 V

/RX-/TX

RX-TX

PCD1.M1xx

PCD2.Mxx0

PCD1.M1xx

PCD2.Mxx0

PCD1.M1xx

PCD2.Mxx0

+5 V

37/

47

/n

36/

46

n n /n

/n

n

PCD2.Mxxx

socket B(1), B2

Pull up

330 Ohm

Pull down

330 Ohm Segment lenght max. 1200 m

max. 32 stations

Termination

Resistor

150 Ohm

At the first and last stations, jumper J1 must be set to the “CLOSED“ position.

At all other stations, jumper J1 must be set to “OPEN” (factory setting)

For installation details, see manual 26 / 740 “Installation components for RS 485“Installation components for RS 485Installation components for RS 485

networks””

The PCD7.F772 Profibus module (details in 4.8.3) and the PCD7.F802 LON module

(details in 4.9) also have an RS 485 interface.

However, these modules are not supported by all PCD1 / PCD2 units.

The wiring is identical to the RS 485 wiring for the PCD2.F520 Modules.

4.6.2 RS 422 with PCD2.F520

RS 422: socket B(1) Port #3

39

38

37

36

35

34

33

32

31

30

PGND

TX

/TX

RX

/RX

SGND

TX

/TX

RX

/RX

J1

OPEN CLOSED

39

38

37

36

34

33

32

31

PCD2.F520

Port # 2RS

232

Port # 3RS 422

Peripheral Cable

Screw

terminal block,

socket B/B1 Socket B(1)