Understood. Thanks again for quick response.

I have robotics background and lots of linux and stuff like that, but never done anything PLC. This seems to be an excellent platform for someone like me. Thanks for great job!

Hi volker, and thank you for your quick and prompt response! I know the modbus-rtu theory of operation, it just was somewhat logical to expect that such an extension module should run as master and not slave. And my interpretation of 'slave' was relative to RPi module, not modbus... (btw I'm not an ...

Hi I need to build a relatively simple setup consisting of 4 pneumatic actuators, 4 pairs of magnetic sensors and 3 stepper motors with drivers controlled by rs-485/modbus-rtu. I'd like to try Revolution-Pi for this project and I have a couple of questions: 1. From what I understand I will need the ...