Hardware Manual for the PCD2.M5 Series│Document 26/856; Version EN 12│2014-07-24
Saia-Burgess Controls AG
Communication interfaces
5
5-13
Serial interfaces - Slots A1 and A2
5.4.4 RS-
485 with PCD7.F150, Port
#1 & Port#2
PCD7.F150:
Connection for RS-485 with electrical isolation
The electrical isolation is achieved with
3 optocouplers and a DC/DC transducer.
The data signals are protected against
surges by a suppressor diode (10 V).
The line termination resistors can be
connected/disconnected with a jumper.
10
11
12
13
14
15
16
17
18
19
J1
OPEN CLOSED
PCD7.F150
11, (1) RX - TX
12, (2) /RX - /TX
RX - TX
/RX - /TX
Bus RS 485
D
/D
SBUS
PGND PGND
PGND
50 VDC
50 VDC
0
1
2
3
4
5
6
7
8
9
J1
OPEN CLOSED
PCD7.F150
PGND PGND
PGND
50 VDC
50 VDC
Socket A1
Socket A2
x3, Port2
x4, Port1
SGND (galv. sep.)
has to be connected with
the shield of the cable
Block diagram:
TXD
RXD
RTS
75176
OPTO-0601
SGND
+5VE
330 Ohm
150 Ohm
330 Ohm
D
/D
+5V
PGND
SGND
+5VE
EN
SGND
Transmit
Receive
RS 485
Driver
DC
DC