5 axis 9 stepper mesa board selection

That one has buffers on the outputs to drives and optocouplers on the inputs, so should do just fine.
Some other with optocouplers on all outputs and inputs will work only if timings are very loose, slow optos. The max i could get from these was 10KHz and the signal was terrible on the scope.

jimmyrig wrote:

 (anyone use the rs485 port on a mesa 7i96s to control a drive that way?) 

 

I am working on it. I got a Modbus relay board working from a Mesa UART last night. 

The aim is to create something configurable, which is likely to take a while (ie the quick-and-dirty demo above does not indicate that the finished driver is imminent) 
 

Awesome work Andy. Will be great for VFDs and some Plasma cutters

andypugh wrote:

jimmyrig wrote:

 (anyone use the rs485 port on a mesa 7i96s to control a drive that way?) 

 
I am working on it. I got a Modbus relay board working from a Mesa UART last night. 

The aim is to create something configurable, which is likely to take a while (ie the quick-and-dirty demo above does not indicate that the finished driver is imminent) 



 

Looks great! I dont mind helping with the dev/testing. Once its to the point it'll take a modbus command let me know! Are you using modbus2hal? 

Well.....looks like I have one of those optoisolator ones which are blah....cant get it to work at all. Still feel like something might be wrong in the hal/ini files as it wont budge one bit. 

Have another board, like the one listed above, arriving tomorrow...will give that a shot.

Included are the hal/ini files

 

In your ini file, from this
DIRSETUP = 10000
DIRHOLD = 10000
STEPLEN = 5000
STEPSPACE = 5000
to this
DIRSETUP = 20000
DIRHOLD = 20000
STEPLEN = 10000
STEPSPACE = 10000
That should barely work with that BOB, if not try both step at 15000
Edit,
Only for the joint/axis connected to that BOB, not for all axis