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 interfaces on socket A

4.5 Plug-in interfaces modules: Socket A

4.5.1 RS 485 / 422 with PCD7.F110, Port #1 (with PCD1.M110 hard-wired)

Connection for RS 485

PCD7.F110:

RS 422 with RTS / CTS or RS 485 electrically

connected, with line termination resistors

capable of activation, for socket A

10

11

12

J1

13

12

13

14

15

16

17

18

19 19

18

17

16

14

11

PGND

RX - TX

/RX - /TX

PGND

RX - TX

/RX - /TX

GND

OPEN CLOSED

PCD7.F110

Socket A

not used

Bus-Cable

Scew terminal block

socket A

Choice of line termination resistors

+5 V +5 V

PCD1.M1xx

PCD2.Mxx0

PCD1.M1xx

PCD2.Mxx0

PCD1.M1xx

PCD2.Mxx0

/RX-/TX

RX-TX

12

/n

11

n n /n

/n

n

PCD1/2.Mxxx

Socket A

Pull up

330 Ohm

Pull down

330 Ohm Segment lenght max. 1200 m

max. 32 stations

Termination

Resistor

150 Ohm

Not all manufacturers use the same connection configuration, so the data lines

sometimes need to be crossed.

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

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

is on the connection side of the module.

For details, see manual 26 / 740 :

“Installation components for RS 485 networks”