A manufacture just asked me
For the USB interface , we have two communication protocols , one is USB to RS232 , one is USB to PS/2 .
Which one is faster? This is a USB Devise.
closed as off topic by Skyhawk, Iain, Tom O'Connor, John Gardeniers, Ward May 24 '11 at 13:53
Questions on Server Fault are expected to relate to server, networking, or related infrastructure administration within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here. If this question can be reworded to fit the rules in the help center, please edit the question.
Originally, RS232 maxed out at 20kbps, but now it is 1.5 Mbps. PS/2 did not have a rate. It transmits serial data as 10-16 kHz, which means it probably tops out at about 20kbps.
RS232 is better (you do not need to reboot for it to be recognized) and faster.