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burkhard · (This post was last modified: 11-01-2018 02:12 PM by burkhard.)

(11-01-2018 07:57 AM)Podalirius Wrote: On the 41CL I typed the command XEQ "CMOPEN"
The 41CL display COMM, and after TIME OUT.

It sounds like you run into trouble at the 41CL end itself with that timeout occurring, before you even started trying to talk to the PC host.

I tried repeating your steps. I plugged in YUPS and then issued XEQ "CMOPEN" exactly as you describe above. Indeed I had a similar problem on my v5 41CL. The TIMEOUT occured quickly (within a few seconds) and it disabled the MMU. The MMU wasn't cleared, though. It seemed that merely issuing command MMUEN brought it back—I did not need to recall the saved config from Alternate Memory or manually rebuild the MMU.

But anyhow...

I think your problem is that you are issuing CMOPEN without having first initializing the port with SERINI. I tried that first and no crash. So please try that.

One more thing, though: SERINI sets the baud rate to 1200 by default, so after SERINI, but before CMOPEN you also need a BAUD48 to set things to 4800.

So try:
XEQ SERINI
XEQ BAUD48
XED CMOPEN