Hardware Manual for the PCD2.M5 Series│Document 26/856; Version EN 12│2014-07-24
Saia-Burgess Controls AG
Communication interfaces
5
5-8
Serial interfaces - Slots A1 and A2
5.4
Plug-in interface modules - Slots A1 and A2
5.4.1 RS-485 /
422 with PCD7.F110, Port
#1 & Port#2
Connection for RS-485
PCD7.F110:
RS-422 with RTS/CTS or RS-485 electrically
connected, with line termination resistors
capable of activation, for Slots A1, A2.
10
11
12
13
14
15
16
17
18
19
10,(0) PGND
11,(1) RX - TX
12,(2) /RX - /TX
PGND
RX - TX
/RX - /TX
GND
0
1
2
3
4
5
6
7
8
9
J1
OPEN CLOSED
PCD7.F110
Bus RS 485
Bus RS 485
J1
OPEN CLOSED
PCD7.F110
x3, Port2
x4, Port1
Socket A1
other terminals not used
Bus-Cable
Screw terminal blocks
sockets A1 and A2
Socket A2
Choice of termination resistors
+5 V
/RX - /TX
n
n
11
n
/n
/n
/n
12
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
Not all manufacturers use the same connection configuration, so the data lines may
need to be crossed