How to build a serial cable for Celestron NexStar telescopes.
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To be sure our cable will work smoothly with any program, we should short some pins on the serial port to create "fake" handshake signals. Otherwise, we could have problems to talk with a "three pin only" serial device. In the following schematics we can see the serial port pinout: we're going to short together RTS/CTS (pins 7 and 8) and DTR/DSR (pins 4 and 6). We will then connect the cable in the following way: wire A to pin 3 (TX); wire C to pin 5 (GND); and wire D to pin 2 (RX).
