TULIP4041 Startup Question

[MeindertKuipers]

I have made some changes in the handling of the serial ports. First of all I now also report (in the console) when a serial ports disconnects, and the connection changes of the PILBox, so it is now clear if a virtual HP-IL device is connected.
When there is a serial connection to the HP-IL port, but no HP-IL device behind it, the firmware still reports this as an open loop (TRANMIT ERR). The console issues a warning when this is the case and I wanted to be able to check for an open loop. The user will know that something is wrong instead of seeing only a closed loop and search for a solution in the wrong direction.

As a bonus I have added the sample counter to the HP-IL Scope window (but it cannot be switched off).
As I am working on a few other minor items the firmware is not yet published.