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Bob Axtell
Reply with quote  #1 
The K149 and K150 power the onboard Virtual Comm Port USB-Serial converter chip (FT232BM) from the wall-wart.

When inserting or removing cables from the K149 or K150, the USB driver can get confused unless the cables are handled as follows:

POWERING UP K149/K150:

1. Install the wallwart and powerup the unit first.
2. Install the USB cable.

POWERING DOWN K149/K150:

1. Remove the USB Cable first.
2. Remove the wallwart and powerdown the unit.

WHY:

The USB hardware at the PC end sees an cable disconnect with a running peripheral as normal, but a disconnect from a non-running (unpowered) peripheral as a fault, and may release the port assignment, i.e. COM5, COM7. The next time the unit comes online, MicroPro may see com port errors until the newly-assigneed com port has been located, especially if another USB peripheral has been installed in the interim. Most people find digging for the new com port as annoying and time-consuming.

A normal, powered release does NOT lose the comm port assignment. That's why K128 and K182 are rarely afflicted with com port changes. If the procedure above is followed, neither will K149/K150 users.


--Bob Axtell
http://kitsrus.com
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