communication timeout - reset send buffer block

dos

Hi. I just built a printer. ramps 1.4 marlin. i tried to connect to it from win 7 computer and send M114 (endstop switches) but got this message. at a speed of 250000 in the arduino com port monitor, the printer reboots once. nothing comes in response. also no response to M114 when sent from arduino ide

Repetier

Sure speed is 250000? Often it is also 115200 especially if you use eeprom and had other values before last compile. Is protocol on autodetect in host? Then it should be working, binary will not work with marlin. If you see some readable messages in log when you hit reset on arduino the speed is correct.