User Manual DDS200 Digital Demodulation System 070-9952-00
User Manual DDS200 Digital Demodulation System 070-9952-00
User Manual DDS200 Digital Demodulation System 070-9952-00
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Appendix F: Remote Control via RS-232-C InterfaceLocal controllerconnection for SoftwareHandshakeFor software handshake, the <strong>DDS2<strong>00</strong></strong> must be connected to the controlleraccording to the following wiring diagram, which is applicable to controllerswith 9-pin or 25-pin connectors.1<strong>DDS2<strong>00</strong></strong>9 pins61Controller9 pins6<strong>DDS2<strong>00</strong></strong>decoder pin2ControllerSignal pinRxD / TxD 33TxD / RxD 25GND / GND 559591<strong>DDS2<strong>00</strong></strong>9 pins61Controller25 pins14<strong>DDS2<strong>00</strong></strong>decoder pin2ControllerSignal pinRxD / TxD 33TxD / RxD 25GND / GND 7591325Figure F–2: Wiring for software handshakeHardware HandshakeIn the case of hardware handshake, the <strong>DDS2<strong>00</strong></strong> signals via the RTS lines that itis ready to receive data. A logic ‘0’ (active) signifies “ready”, a logic ‘1’ means“not ready”.Via the CTS line the controller informs the <strong>DDS2<strong>00</strong></strong> that it is ready to receivedata. A logic ‘0’ activates data output whereas a logic ‘1’ commands the<strong>DDS2<strong>00</strong></strong> to stop data transmission. The DTR line remains active (logic ‘0’) untilthe serial interface is switched for remote control.F–6 <strong>DDS2<strong>00</strong></strong> <strong>Digital</strong> <strong>Demodulation</strong> <strong>System</strong> <strong>User</strong> <strong>Manual</strong>
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