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Saia-Burgess Controls AG
Manual PCD2.F2xxx serial interface
modules │ Document 27-649 ENG02 │ 2018-08-15
Module variants
PCD2.F2xxx serial interface modules
1-15
1.5.4
RS-485 galv. isolation - PCD7.F150S serial interface module
Electrical isolation is achieved using three optical couplers and a DC/DC converter.
The data signals are protected against excess voltages by a suppressor diode
(10 V). The terminating connectors can be linked using slide switches (CLOSED)
or isolated (OPEN).
PCD7.F150S
RS-485 terminator
Slider
1 2
ON
C
O
Closed terminated
Slider
1 2
ON
C
O
Open not terminated
(factory setting)
RS 485 connection
Port x.1
RS-485
10 pin spring-loaded terminal block
0 PGND Rx-Tx 1
2 /Rx-/Tx
3
4
PGND 5
6
7
8 (SGD)
9
x0 PGND
x1 RX - TX
x2 /RX - /TX
PGND
RX - TX
/RX - /TX
GND
RS-485
RS-485
RS-485
Peripherie-
device
Terminal
Line terminator:
+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
The line terminator for port x.1 is integrated into the module and can be activated
using a switch on the module. In addition to the switch, the following indications
appear on the LP: ‘O’ for OPEN and ‘C’ for CLOSED.
1