5-axis Isel-based machine - Logosol to LinuxCNC?

I've been diligently building up a 5-axis machine for machining small analytical instrument parts like fluid manifolds. My work envelope requirement is quite small. It's common to drill 0.5 mm holes 10 mm deep, and have them connect with an intersecting hole on another axis.

 

The pictured machine is wired with a Logosol CNC package (5 Logosol LS-231 drives + 1 kW spindle drive + a supervisory controller that manages door safety and more). This package is likely in many small specialty CNC machines produced around the world. I've been using Logosol's Windows based CNC program, which is free (Thanks, Logosol!) but is not really supported, updated, or documented. I've been in touch with a Logosol support person, who has been great to work with, but the software feels like a dead end. It's been great for proving the concept, but I'm forecasting a move to LinuxCNC.

The Logosol drives and supervisory controller are nicely wired - so it would be a shame to alter the reliable wiring to use ±10V or step + direction. Logosol's protocol is via RS-485, and includes 256 point path buffering.

My thought is to write HAL components to interface LinuxCNC pins to Logosol's LDCN protocol. The servo drives run a 51.2 microsecond update rate, so 20 servo ticks is 1.024 ms. LinuxCNC's update rate is 1 ms. I can either alter LinuxCNC's rate, or downsample the path points to match (feedback here is appreciated!).

I'm based in Raleigh NC, USA and welcome helpers or onlookers in my shop!

Edit: Isel is the company that made the 3 linear axes and the 2-axis A&B trunnion. They made the vertical brackets, the extruded aluminum base, and many other components. I presume they integrated the whole machine as a 'box builder', and the CNC vendor is more of an applications specialist. The build quality is fantastic.

One more note: The spindle is a Jaeger, and supports tool changes. You can see 12 tool holders dismounted from the bed + a tool height sensor.

I have several simpler LS-173E drives, which only have the RS-485 command interface. I had a project to implement LDCN in a microcontroller for standalone operation, but it's on the back burner this year. No opinion on feasibility with LinuxCNC, but I stumbled across this project that might be useful:

"Linux port of Logosol's LDCN with Python bindings"
github.com/cversek/linux-ldcn

Good luck with this. There is no reason why you can't run a 1.024 Ms servo thread if that's important to remain  synced.. Its just a hal file setting...

125000 bits/sec. All LDCN network comms must start at 19200, then get upgraded.

One sets a servo update rate multiplier (e.g. 20x) so the 51.2 µs becomes only the control loop update time, but the commanded position is updated every 1.024 ms. Yes, correct - at 51 µs, the bandwidth would be insufficient.

If interested, I developed HAL components to initialize the LDCN, enumerate the devices, and expose pins to LinuxCNC. Like any software project, it needs experienced eyes to pick apart the architecture.

github.com/ndemarco/linuxcnc-logosol