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

Serial interface on Port#0

4.4.3 PGU connection (PORT # 0, only on PCD2.M1x0) (RS 485) as communica-
tion interface

If Port #0 is not used via the PGU connection (with the programming device or as

an RS 232 interface), it can be used via terminals 28 and 29 for an S-Bus or MC4

connection.

29

27

26

25

24

23

22

21

20

D

/D

WD

WD

J 0

OP

EN

CL

OS

ED

PCD 2 .M 110

PCD2.M120

PCD2.M150

RX - TX

/RX - /TX 28

RS 485

Bus-cable

Screw terminal block

29

27

26

25

24

23

22

21

20

D

/D

WD

WD

J 0

OPEN

CLOSED

PCD2.M170

28

Choice of line termination resistors

+ 5 V

/RX-/TX

n n

29 n

/n

/n /n

28

RX-TX

PCD 2 .M1x0

Port #0

PCD 1 .M1xx

PCD2.Mxx0

PCD 1 .M1xx

PCD2.Mxx0

PCD 1 .M1xx

PCD2.Mxx0

+ 5 V

Pullup

330 Ohm

Termination

Resistor

150 Ohm

Segment length max. 1200 m

max. 32 stations

BusRS 485

First station Middle stations End station

Pulldown

330 Ohm

At the first and last stations, jumper J0 must be set to the “CLOSED“ position.

At all other stations, jumper J0 must be set to “OPEN” (factory setting).