JULABO MA-26 Heating Circulators - Manual (Page 45)

MA
45
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