SBC PCD2.M5 Series - PGU Connection (PORT # 0) (RS-485) as Communication Interface

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rst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).