Saia-Burgess Controls AG
Manual
Manual PCD 1 / PCD 2 Series
│ Document 26
/
737 E
N22 │ 2013-11-26
4
Communication interfaces
4-9
Onboard interfaces
4.5.4 RS-485 communication interface PORT # 1, only on PCD1.M110
On the PCD1.M110, on Port #1, is a built-in RS-485 interface.
10
11
12
13
12
13
14
15
16
17
18
19
OPEN
CLOSED
19
18
17
16
14
11
PGND
RX - TX
/RX - /TX
PGND
RX - TX
/RX - /TX
GND
Bus RS-485
not used
Bus-cable
Screw-
terminal-
block A
Bus RS-485
PCD1.M110
Choice of the termination resistors
+5 V
PCD1.M110
Port #1
PCD1.M1xx
PCD2.Mxx0
PCD1.M1xx
PCD2.Mxx0
PCD1.M1xx
PCD2.Mxx0
/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-RS485
First station
Middle stations
End station
Pull down
330 Ohm
At the first and last stations, the jumper must be set to the “CLOSED“ position.
At all other stations, the jumper must be set to “OPEN” (factory setting).