Bosch VFD and rs485

Hi. I would first like to thanks Andy for the help in getting my lathe sub routines done. It works great. My lathe is 99% complete, just left spindle control. That's where I am stumped. This is all very new to me. I have a Bosch EFC3610 VFD thats supports modbus and rs485 input. I have bought a usb to rs485 adaptor but have no idea how to set up my lathe so Linuxcnc controls spindle speed. Its a 0.75hp 3 phase motor. The VFD controls the speed using the VFD panel well, installed and tested it today. The software side has got me stumped. Also, the spindle speed display in axis works (my lathe has a index and phase a). But it only shows speeds up to 115RPM, then got back to 0, even though motor spinning at about 1000rpm. Is it my optocouplers, the way I have set it up, or just me....lol. If anyone can help. I have searched on here but just got even more confused reading peoples very clever electrical terms, way over my head. I am an engineer, machine shop etc - electronics are very very new to me.

Hi. My encoder plate has 45 holes due to small space available. I have however noticed my BOB does NOT have a pin for 10V control so have ordered another board. Decided to go with analogue control as modbus seems to be unreliable with a usb dongle.

Hi. OK, I can send you a screen shot. Its very strange, it goes up to anout 190rpm then falls back to 0 as I increase the speed. I was wondering if maybe the infra red optocouplers from ebay are CR@P

OK, Let me see what I can do. Would you know anything about a Mach 3 board? I am trying (in my other post) to get it to control the motor via a VFD. But I am getting no voltage on the 10v and GND pins. It also has a PWM pin. Should there be voltage on this? I am really confused. This is the final chapter on my lathe build and has got me really stumped. The docs says pin1 is PWM, but I need pin1 for amplifier enabled to run my motors, otherwise they just spin one way (using MD430 driver boards from ebay)