Series 2000 Communications Handbook

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Digital Communications HardwareSeries 2000 Communications Handbook2.6. PRECAUTIONS2000 series discrete instruments have fully isolated communications circuitry. In most PCsthe comms ports are also fully isolated. In conditions where excessive static build up may beexperienced there is a danger that damage could occur to PC or controllers. In thesecircumstances it may be an advantage to add a high value resistor (1MΩ for example)between the common connection and ground. Under normal circumstances this resistor is notnecessary.2-6 Series 2000 Communications Handbook Part No HA026230 Issue 2.0 Feb-00
Series 2000 Communications HandbookDigital Communications Hardware2.7. WIRING RS232To use RS232 the PC will be equipped with an RS232 port, usually referred to as COM 1.To construct a cable for RS232 operation use a three core screened cable.The terminals used for RS232 digital communications are listed in the table below. SomePC's use a 25 way connector although the 9 way is more common.Standard Cable PC socket pin no. PC Function * InstrumentTerminalInstrumentColour 9 way 25 way FunctionWhite 2 3 Receive (RX) HF Transmit (TX)Black 3 2 Transmit (TX) HE Receive (RX)Red 5 7 Common HD CommonLink together 146Link together 78681145Rec'd line sig.detect Data terminalreadyData set readyRequest to sendClear to sendScreen 1 Ground• These are the functions normally assigned to socket pins. Please check your PC manualto confirm.RxTxComTx HFRx HECom HDComputerLocal ground2000 SeriesControllerFigure 2-1 RS232 ConnectionsSeries 2000 Communications Handbook Part No HA026230 Issue 2.0 Feb-00 2-7
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