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The first step in the getting my treadmill back into operation is to determine whether control via the RS232 serial port is viable.  Although I have a TM400/S, the TM400AC Manual appears to be close enough and it included a RS232 Test Plug procedure.  I was thrilled to see that the treadmill is equipped with a RS232 Test Plug that cycles the treadmill through a variety of tests to verify treadmill operation.  Basically, you insert the test plug into the RS232 port and press a button on the plug to initiate each test.  I was pleased to see that my treadmill (including RS232 port) appears to be fully operational.

I should have gotten the Trackmaster TM400 RS232 Serial Protocol as soon as I got the treadmill but, since I didn't, I'll have to make do with the TMX425 RS232 Serial Protocol, which appears to be Section 9 of the Trackmaster FVX-TMX Series Field Service Manual.  With luck, the Trackmaster serial protocol is enough of an industry standard that it has remained the same over the years.

Some basic TrackmasterRS232 requirements

  • DB9 Connector 9 pin PC/AT Style
    • Pin 2 - Transmit Data
    • Pin 3 - Receive Data
    • Pin 5 - Signal Ground - RS232 (+/- 10V)
  • 4800 Baud
  • No Parity
  • 8 Data Bits
  • 1 Stop Bit
  • Full Duplex

Now that I have the Trackmaster series protocol, I need to figure out the correct syntax to send and receive serial port data with Python.  More to follow later.