MA
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).
/
Control output
The connector may be used for control of JULABO refrigerated
circulators or as output for alarm messages.
1
3
2
4
5
Circuit: Operation
= relay powered
Alarm
= relay not powered
Pin assignment:
Pin
Signal
1
+24 V (I max. current 25 mA)
2
0 V
3
Alarm relay
4
Reserved - do not use!
5
Cooling pulse
RS232 serial interface
This port can be used to connect a computer with an RS232 cable
for remote control of the circulator.
9
6
5
1
RS232C
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!
RS232 interface cable
Circulator (9-pol)
PC (9-pol)
Pin 2 RxD
⇔
Pin 3 TxD
Pin 3 TxD
⇔
Pin 2 RxD
Pin 5 GND
⇔
Pin 5 GND
Pin 7 RTS
⇔
Pin 8 CTS
Pin 8 CTS
⇔
Pin 7 RTS
Accessories:
Order No.
Description
8 980 073
RS232 interface cable 9-pol./9-pol. , 2,5 m
8 900 110
USB interface adapter cable
43
