oe8bck Posted January 13, 2016 at 02:14 PM Share Posted January 13, 2016 at 02:14 PM Hi, I found some topics regarding connection to external MODBUS devices from the RED brick, but I have a little bit different setup. Currently I have a frequency inverter controlled via MODBUS and a Python module. I also have a Master Brick with a stepper motor and its Python module. There is a Python program accessing both modules and it works well as long as I do not connect the AC motor to the system. So stepper control wors, inverter control without motor works, but starting the motor resets the Master Brick. So there is somewhere a coupling from the motor to the Tinkerboard system. I did a lot of tries to lower this coupling from the power supply side and also with some ferrite beads on the cables. It is improved now a little bit, but still not functional. The last thing that comes into my mind in order to reduce coupling is the USB interface. I know from other projects that the ICs used there are very susceptible with respect to EMC. The MODBUS interface with its physical layer RS485 is much more robust. So I would like to replace the USB connection with a MODBUS interface. Is there a way to do it? BRICKD<->PC<->MODBUS<->RS485 Extension<->Master Brick To make it a little bit mor "thrilling", there is a timing constraint given by the customer. He wants a demonstration by mid of next week, so there is not time to order additional hardware. Any ideas are highly welcome! KR, Christof Quote Link to comment Share on other sites More sharing options...
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