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Others will know more than me but that looks like  a JST connector. Something like this 
www.ebay.com.au/itm/154065078026?chn=ps&...9UbkzuugEo8uJPwuwmfk

They come in different pitches eg 1, 1.5 , 2.0mm etc so measure the distance between pins

You might be able to get a uart to rs485 adapter and make your own cable  to pick up the expansion port. Just check the voltage the PC uses. If you need 5 volts, you could steal it from a USB port.
core-electronics.com.au/ttl-uart-to-rs48...D1tkF_xoCPwkQAvD_BwE

Other than that, the USB version (which I use) is OK. Once, it changed to a different USB port then it has not changed again! I just needed to edit the config file to use the different port.

Seems to be a smaller pitch. 10 pins (none missing). Cant find anything online vaguely resembling it, lenovo does not seem to offer it as a part I can find. All my other lenovos use a different type of cable.

 

Soft limit values can be changed through mcodes using the appropriate ini hal pins. For an example see the included 'millturn' sim config:
github.com/LinuxCNC/linuxcnc/tree/master...mach/millturn/mcodes

Apparently the serial is through a special cable on these, not just the normal 2x12 board pins and those cables are are and expensive. sigh.

How much worse is the usb adapter? This is not a critical application really so if it lags some milliseconds I don't think it matters. The most critical thing is being able to respond to an alarm and stop the machine.

 

the error says spidle.1.on does not exist ,

the qtplasmac_comp.hal needs those spindle pins
github.com/LinuxCNC/linuxcnc/blob/master...plasmac_comp.hal#L28

you need to set up those spindle pins to use qtplasmac
github.com/LinuxCNC/linuxcnc/blob/master...c_metric_ini.inc#L46

in gmoccapy, click on the settings button in the lower right:
 

You might have to put in the default code to enter the settings:
 

Once you are on the settings page click on the halshow button in the lower right:
 

Once the halshow tool opens you can expand the 'pins' in the left hand panel by clicking on the + beside it and check for 'pyvcp'
 

Maybe the EL5101 can say when it doesn't have a good reading, or something along those lines. Obviously check cabling.
It seems you get zero Hz as frequency, that's a unique signal, THCAD always give some hundred/thousand of Hz.
Maybe some hal trickery to hold the last good value while frequency is zero. An own component perhaps.