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