SL
85
11. Electrical connections
Notice:
Use shielded cables only.
The shield of the connecting cable is electrically connected to the plug housing.
The unit ensures safe operation if connecting cables with a maximum length of 3 m are
used. The use of longer cables does not affect proper performance of the unit, however
external interferences may have a negative impact on safe operation (e.g. cellular
phones).
ext. Pt100
Socket for external Pt100 sensor
Pin assignment:
Pin
Signal
1
I+
2
U+
3
U-
4
I-
The shield of the connecting cable is electrically connected to the plug housing
and the sensor tube.
SERIAL
RS232/RS485 serial interface
This port can be used to connect a computer with an RS232 or RS485 cable
for remote control of the circulator.
Pin assignments RS232:
Pin 2
RxD
Receive Data
Pin 3
TxD
Transmit Data
Pin 5
0 V
Signal GND
Pin 7
RTS
Request to send
Pin 8
CTS
Clear to send
Pin 1; 4; 6, 9 Reserved - do not use!
Pin assignments RS485:
Pin 3
B
Pin 5
0 V
Signal GND
Pin 6
+5 V (max. 50 mA)
Pin 8
A
Pin 1; 2; 4; 7; 9 Reserved - do not use!
Notice:
RS485 serial interface
The max. load current between pin 5 and pin 6 is 50 mA.
4
1
3
2
1
4
2
3
Shield
Plug
Look on
soldering side.
Pt100
9
6
5
1
