![]() Trinket does not have a Serial port connection for debugging so the serial port monitor will not be. ![]() There's an excellent forum at the software supplier's website if you have a license. Its our lowest-cost Arduino-IDE programmable board. Linux RTU master, USB-Interface 115200bps, using several Modbus implementations freely. The designations can vary from that diagram, since much of it is configurable in Mach3. The Arduinos Serial class has been used for communication. It was originally a printer control port. Note that some pins are logically inverted. The "P" designations on the board refer to the pins on the DB-25 Centronics port. Notebook computers are generally unsuitable. In order to get Mach3 to work well on a PC (providing properly spaced step/dir pulses in the tens of kHz range) you generally need a "real" parallel port, rather than a USB-parallel converter, so you'll have to find a plug-in board that has that kind of an interface. All the board does is to buffer and opto-isolate the signals from the parallel port lines to the stepper drivers, limit switch inputs and so on. The communication (such as it is) is via the large "Centronics" parallel port just to the left of it. ![]() The USB port is only there to provide power for the 5V relay and buffers (maybe just the buffers, there appears to be a voltage regulator on the board as well).
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