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4 General

jins85e1 1.fm Interface Description(1101)

1.2 RS232 Interface Connecting Cable

The RS232 interface is wired as data communication equipment (DCE).

T-Guard™ Leak Detection Sensor provides a 9-way sub-D socket for the connector.

The signals are assigned as follows:

The other pins are not being used.

The levels on the RS232 interface are defined as follows:

Physical Assignment

You can use a standard RS232 cable (straight-through connecting cable, RxD and

TxD not crossed, no Null Modem Cable). The RS232 hardware handshake must be

switched off in your software program. If you cannot switch off the hardware

handshake, an RS232 cable wired as follows may be used:

Pin Name Signal

2 RxD Receive data (T-Guard™ → PC)

3 TxD Transmit data (PC → T-Guard™)

5 GND Reference Ground

Level Low (L) High (H)

Voltage Range -3 V … -25 V 3 V … 25 V

Logic State logical 1 logical 0

Level Designation Mark Space

Fig. 1-1 Physical assignment of the RS232 cable to work around

hardware handshake.

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Inficon T-Guard Leak Detection Sensor Interface descriptio Manuale Utente Pagina 4