[X4U] Problem with prolific2303 usbserial driver

[Cheryl Homiak]

I am trying to hook up a braille display to my mac mini using a  
usbserial cable. The cable uses the prolific pl2303 driver and I have  
the latest version; it is even a universal binary. I think that at  
one point I had this working correctly but now something is wrong.  
After hooking up the braille display to the computer, I can get just  
one response from it. For instance:

echo "I am very frustrated with usbserial" > /dev/cu.usbserial
gets that repeated--this macine has speech as well as braille.  
however, after that first response, unless I either reboot or unplug  
the cable from the usb port and replug it, I get no further  
responses. If I do unplug and replug the usb connector, I then get  
another successful response--but only one.

There is nothing defective in the serial cable or the usbserial  
adaptor as they load and work perfectly and consistently on my linux  
laptop. I am on the verge of giving up and buying another adaptor but  
I hate to do that unless it's absolutely necessary. If anybody has  
any suggestions as to how to try to solve this problem, I would be  
very interested; I have googled this and found some problems but not  
this particular one. I am running macosx.4.6 on a ppc mac mini.

Tia.

-- 
Cheryl
"Where your treasure is,
there will your heart be also".