Hardware Manual for the PCD2.M5 Series│Document 26/856; Version EN 12│2014-07-24
Saia-Burgess Controls AG
Communication interfaces
5
5-5
Onboard interfaces
5.3.3 PGU connection (PORT # 0) (RS-485) as communication 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
RX - TX
/RX - /TX
28
RS 485
Bus-cable
Screw clamp terminal block
S1
O
C
Choice of termination resistors
+5 V
/RX - /TX
n
n
29
n
/n
/n
/n
28
RX - TX
+5 V
Pull up
330 Ohm
Termination
Resistor
150 Ohm
Segment length max. 1200 m
max. 32 stations
Bus RS 485
First station
Middle stations
End station
Pull down
330 Ohm
At the first and last stations, switch S1 must be set to "C" (closed).
At all other stations, switch S1 must be left in position set to "O" (factory setting).