24
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.
RS232 serial interface
This port can be used to connect a computer with an RS232 cable for remote
control of the recirculating cooler.
RS232C
Pin assignments
:
Pin
2
RxD
Receive
Data
Pin 3 TxD
Transmit
Data
Pin 5 0
VD
Signal
GND
Pin 6 DTR
Data
terminal
ready
Pin 7 RTS
Request
to
send
Pin 8 CTS
Clear
to
send
Accessories:
Order No.
Description
8 980 073
RS232 interface cable 9-pol./9-pol. , 2,5 m
8 900 110
USB interface adapter cable
1
2
3
Alarm output
Potential-free change-over contact for external alarm signal.
Pin 2 and 3 are connected in case of an alarm.
Pin 2 and 1 are connected in "OFF" or "rOFF" condition
or mains switch "Off".
Switching capacity
max. 30 W / 30 VA
Switching voltage
max. 30 V
∼
/
−
Switching current
max. 1 A
