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digadv

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  1. Try a 10kohm resister between the TX and GND. The issue is that the interface is NOT RS-232 level (+/- 12V) so a normal serial port will not work. It's 0-5v and if you use the interface card I referenced above, you will be able to establish communications with the OEM software and a USB interface. I have successfully built and programmed a PIC microcontroller to act as a remote control unit - similar to the OEM version. I can tell you that it would have been much cheaper to just purchase the OEM unit, but the project was a good learning experience. Good luck.
  2. Yet another entry into what has become an archive. The attached diagram worked for me. The key was the USB/serial interface. They are not all alike so if you are having issues, I would suggest the MikroElectonika USB UART (MIKROE-483). Mouser sells these for $10.95. Good luck. ProChrono.pdf
  3. I believe you're right on the ground identification because it ohms out with the "-" on the battery terminal. However, if I connect the grounds (computer and chrono), my transmit path to the chrono stops working. Without the grounds connected, my software correctly controls the chrono with RS232 levels. However, I can not get any information from the chrono. When the grounds are connected, it seems to bias the signal up so that I do not get the full -12V swing ... more like -5V and software stops working. Surely someone has successfully done this - we just need to find them
  4. I would like to know also, but I tried a more simple test ... I've tried to get a simple serial port to connect to the unit using the CE software on their webpage. While I can get the unit to respond to commands from the software, I can not receive any data. It appears that the unit's TX signal does not meet RS232 signal specs (+/- 12V). Any feedback would be appreciated.
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