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RS232 null modem cable wiring diagram.

RS232 null modem cable wiring diagram.

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Fig. 1. Block Diagram of Helium Extraction Line Valves 1 -13 are...
Fig. 2. Block Diagram of the solution.
Fig. 3. Flow chart of host computer to microservice API communication flow.
Fig. 4. Valve Driver Schematic.
+2 Fig. 5. A) Bipolar Stepper Motor. B) H-Bridge stop position. C)...
Combining low-cost single board computers with open-source software to control noble gas extraction lines
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  • Dec 2022
Specialised mass spectrometers such as those used in noble gas geochemistry are often controlled by bespoke computer systems that get harder to maintain as, along with their expensive interface cards, they become obsolete. This work explains how bespoke interface cards and obsolete versions of software can be replaced with low-cost single board com...
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... USB Serial connections are made available to the Linux operating system under the device identifiers /dev/ttyUSB0 to /dev/ttyUSB3. To connect the CH340 RS232 connector to the RS232 connectors on the vacuum gauges a null modem is required that links the Transmit Data (TD) connection on the computer with the Receive Data (RD) connection on the gauge and the RD connection on the computer to the TD on the gauge ( Fig. 7 ). ...