I am very new to building CNC machines, I have months of experience with 3D printers, specifically the Ender 3. I’ve gotten to the point in my MPCNC Primo build where I have to connect the motors to the Rambo board, and then connect that to my computer. When I click connect on the Repetier Host program I get the message “No start signal connected - forcing start”. This is then followed by a red message "Communication Timeout -
I bought the board directly from Ultimachine. On the website, they say that the Marlin firmware came pre-installed.
Connection Settings:
Port - Auto
Baud Rate - 250000
Sometime installing Repetier gets a Repetier Server install which monopolizes the USB port. May not be your issue if you’ve used Repetier Host successfully in the past, but worth mentioning. I’d also use the port drop-down and see what shows up, and manually select the desired controller if you see it.
I don’t use this board but recall others saying “switch the baud rate” - I don’t recall what they switched it to, maybe 112500?
I made sure to use the Stop Server and stopped that from potentially using the USB port. Following this I changed the Baud Rate to 115200 and clicked connect, resulting in this error
