Just picked up an oldish (2003) Liyu CNC router (model LE-5032 or SGJD5232). No software (but there are a couple of unmarked dongles) and the manual is in chinese :). The dongles could be for type3 or bitcam.

The builtin test file runs OK and the spindle starts up when I send it a HPGL file via serial cable but I get no xyz motion. I think the spindle starts as soon as data shows up on the serial port though i.e it's not controlled by the incoming HPGL code. I also tried generic g-code but from what I can gather from the manual it requires HPGL or DMPL.

I just relocated a PC with a "real" serial port next to the machine to make sure it's not a usb-serial cable issue but still no luck. Maybe it doesn't like my HPGL (or it could be waiting for a specific init code). I'm going to try a 25pin parallel cable anf sending to LPT1: next.

Anyone know what HPGL should look like for one of these machines?

After much trial and error, random googling for english word combos in the printed manual and google translate of chinese manual pages I seem to have got HPGL into the router. As I suspected it needed some specific init codes.

I'm not 100% sure the scale is correct yet but I can change that easily enough the post-processor.

Next I have to hook up the water cooling for the spindle and see if I can cut something.