latency time serial interrupt

we are using digiconnect me (c-type) to receive serial data with com1 interface.
I was surprised about how long it takes to receive data. I have measured, that it takes 1,5ms from “last character was on the line” to “entering interrupt function” (I have set/reset a port and measured it with a scope)

Anyone any idea how this time can be cut to a reasonable value?


Hi again,
well, it seemed to be a problem with the ‘Receive Character Gap Timer’. After setting this timer to a more reasonable value it takes now only 600us till getting into the interrupt service routine.
–>Problem solved.

Thanks anyway,