Another consideration when using USB to RS232
converters, as well as any NMEA
USB device, is the serial
mouse issue in windows.
data can be mis-interpreted as a serial
mouse data. If this happens your mouse cursor will jump around the screen
wildly and random mouse clicks will occur.
Some drivers will have this feature turned off whilst others not. It is probably quite hard to find this out from the vendor but fear not there is a solution. In device manager the offending USB device will be shown up here "Mice and other pointing devices" listed as "Microsoft Serial Ball Point"right click it and select disable.
USB-to-serial adapters are not all created equally. If you buy one that is not Windows Logo Certified for your particular OS version, you may save $5. But those that are logo certified and listed on the Microsoft Hardware Qualification List (HCL) for the OS have been extensively tested and are known to work most if not all of the time.
I have a lot of experience using a well known brand of USB chips. I have to modify the drivers inf file to remove the serial mouse issue I previously mentioned. This modification removes the certification
even though this does not effect the operation of the device in a way that is damaging to windows.
If a manufacturer uses a USB chip but wants to have it uniquely identified they have to change the PID of the chip and modify the drivers for this. This also removes the certification
, to recertify is expensive and pointless in this situation as the driver is already proved, that gives you your $5 saving.
Another thing to consider is certified drivers can still cause BSOD's as I have witnessed, have you ever read the release notes for USB driver updates that mention BSOD fixes?
Certainly though they are not all created equal, I have seen many that are poor quality and don't stand up to pressure especially now AIS
comes in with 38400 baud.