Messages

1

SmartBOB controllers and dedicated accessories / PMDX 407 solid state relay

« on: November 25, 2021, 08:45:37 AM »

I'm using the PMDX 407 with the PMDX 424 and Mach4. How is the PMDX 407 solid state relay controlled? The only SmartBOBUSB outputs are Relay, Output 1-3 and they are on the 424.
Thanks for any help.

2

SmartBOB controllers and dedicated accessories / Re: Are there bias resistors on the input signals of the PMDX 424?

« on: December 08, 2020, 09:31:44 AM »

I have encoders with index pulse on the lead screws and X and Z limit switches. I would like to home on the limit switches then move off to the first index pulse using a probing call, mc.mcCntlGcodeExecute(inst, "G31 X-.5000 f2"), near the end of the refAllHome function. And mc.mcCntlGcodeExecute(inst, "G31 Z-.5000 f2") for Z. Then set Home.

I will use PMDX ("Input A", encoder A signal), X Index signal for the Probe input and "Input B", encoder B, Z Index signal for a user input. In code when the user signal goes high it will set the Probe signal high stopping the G31 move and set home.
I have to verify but I believe the rotary shaft encoders have an open-collector style output. If not I'll use MOSFETS in each Index line.


 

 

3

SmartBOB controllers and dedicated accessories / Are there bias resistors on the input signals of the PMDX 424?

« on: December 07, 2020, 08:22:07 AM »

I don’t have a board here to test and I would like to connect encoder Index signals from 2 encoders to “Input A” of the PMDX 424. Should I use diodes in the signal lines? They will be used for Probe 0 G31 input. Thanks for any help.

4

SmartBOB controllers and dedicated accessories / Re: SmartBOB probes on encoder inputs

« on: December 07, 2020, 08:10:39 AM »

Thank you. The PMDX plug-in release notes section 9, "Probing Features and Restrictions" explained this very well. I appreciate your help.

5

SmartBOB controllers and dedicated accessories / SmartBOB probes on encoder inputs

« on: December 06, 2020, 03:04:24 PM »

How many probes are supported on the plugin? May I use inputs from another plugin?
Thanks for any help.