Hello folks,

I have got TTY equipment which has parallel port of 20 PINS; I am looking for an adapter which can convert Parallel port to USB. Please advise if this is possible? Usually Parallel port have 25 PINS.

Thanks,
AJBelow is a google link to a pinout for Parallel 25-pin standard.... There are numerous redundant Ground Pins that if SOMEONE wanted to, could remove ground pin redundancy to GET 20 pins or less.

I would try to find the pin out for the 20 pin you have and make a 20 to 25 pin converter. Radio Shack usually has the DB25 kits, however the 20 pin may be a SPECIAL order item as for the next in stock for Radio Shack is probably the DB15 and then the DB9. DB20 if that is what it is..is a unusual connection for parallel that I know of.

But basically with a 20 to 25 pin adapter if its TRUE Parallel communications, and then a standard 25 pin to USB adapter, you may be able to get it to work, however drivers may be another issue if you cant get it to work with a legacy driver etc.

https://www.google.com/search?q=parallel+port+pinout&biw=1024&bih=629&tbm=isch&imgil=eYAl4bSQLBLF4M%253A%253Bhttps%253A%252F%252Fencrypted-tbn1.gstatic.com%252Fimages%253Fq%253Dtbn%253AANd9GcTIRbvJeWY4B50xmRMNt8E97N7HQ2d74Xa31Nf5q9CEMbUHjGAF6Q%253B433%253B390%253BWIXmGC19BCuWyM%253Bhttp%25253A%25252F%25252Fen.wikipedia.org%25252Fwiki%25252FParallel_port&source=iu&usg=__mNtd5Hsu3hBByc7tMfGuS0YUN20%3D&sa=X&ei=owc_U6zcJ8WX2QWfhIDoBA&sqi=2&ved=0CCgQ9QEwAA#facrc=_&imgrc=eYAl4bSQLBLF4M%253A%3BWIXmGC19BCuWyM%3Bhttp%253A%252F%252Fupload.wikimedia.org%252Fwikipedia%252Fcommons%252Fthumb%252Fe%252Fe0%252FParallel_port_pinouts.svg%252F433px-Parallel_port_pinouts.svg.png%3Bhttp%253A%252F%252Fen.wikipedia.org%252Fwiki%252FParallel_port%3B433%3B390Thanks DAVE, I will try that out.

Regards,
AJHi

TTy equipment is normally serial not parallel. Can you supply some data on the make and model of TTY equipment so the connections can be checked.