Serial connection

Hi there
Can´t connect the serial printer K8200 to computer.
Followed all printer and com setup requirements and when say connect (RepHost 95f) get the log:
serieller Verbindungsfehler: System.IO.Ports.serialErrorReceived.Event Args
Any Ideas ?
… changed the Com-speeds, used a different Pc., SupllyVoltage o.k., used different RepHost Versions - even 0.84, …
nothing helped.

First check in the [color=#408040]Wiki [/color]if you can’t find an explanation (especially #5).