[Elecraft] Checking U1 for communication with the K3

[Art Nienhouse]

I want to check my K3 for communication with my computer.

Does anybody know what value and which pin to check on U1 on the I O 
board lightning strike near by hit my wireless router modem and killed 
my desk top computer which was connected to my K3 rs232 port?
I do not have at this time any computer or usb/serial adapter to test 
the radio with.

Regards
Art
ka9zap