No Serial Port - What to do?

para6654

First off, I was successfully able to use my Javelin Stamp board with my desktop computer.· Everything works fine.·

Now, I am trying to use my laptop with my Javelin stamp board.· My laptop, unfortunately, does not have a serial port I can use.· I tried to use a USB to Serial port adapter.· The Javelin IDE·successfully identifies the stamp board and I am able to start a connection test.· At the end of the test I get a message "TSXComm:: Got kComEndLoad".· When I try to download and debug I get an error IDE-0022 Error Reading from the serial port (timeout).·

What can I do to use my javelin with a laptop?

Peter Verkaik

What chip does your USB to serial cable use?

If it has·a FTDI chip or a Prolific chip (PL2303) than your cable is suited

to program the Javelin. Other vendor chips may have

trouble programming the Javelin. I believe there is a setting in
the USB device manager to minimize the delay response.

regards peter
·

para6654

Thanks for the prompt reply.



It appears to be a prolific "adapter" (at least Windows hardware manager shows prolific in the name).

Peter Verkaik

Check in device manager the com port number used by the USB to serial cable.

You find that number under port settings -> advanced.

Then, in the Javelin IDE program, check Projects -> Global options -> Debugger.

Click on button right to com port drop list.

This let you add the used com port to the list if not already listed.

You can try to change the com port number used by the usb cable, to a new number

that is currently not in use. Then restart windows and try the Javelin

project -> test connection again.

regards peter

para6654

The COM port is COM5 is across the board.· I am assuming that this is sufficient as far as the COM port goes.·

Chris Savage

Hello,

·· Your USB adapter is not one of the units we have tested to work, but one thing you can try, since you're using a laptop, go into your serial port properties, under advanced.· See if your driver lists a latency timer.· If it does make sure it's set to 1.· And, if by change your adapter has a listing for a FIFO buffer (Unlikely) disable it.· Restart your computer and try again.· If this doesn't work, you may find you need a compatible USB to Serial Adapter.· Many don't follow the RS-232 standard completely.· This can cause all sorts of problems for programming the BASIC Stamp and Javelin.

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Chris Savage
Parallax Tech Support
csavage@parallax.com