Electrical connections
50
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.
13
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.
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
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