(I can, however, see clear activity on the RS232 lines). Im pretty sure I screwed up my firmware because now I cant get any motion.I am unable to detect any serial activity on the TTL lines with my digital oscilloscope.

So many test and so many outcomes, I think its time for a new set of multi meter leads. So I thank you sys for all of your patience and explanations there. I contemplated doing the dual firmware 2.0 firmware from: but I dont want to hook up the end stops and I seem to recall something not working right if the end stops arent there. I mean life goes on but I hate feeling like Im missing something. I can call M42 P45 S255 and presto it works M3M5 never make any changes for that pin though I can make it function on the 12v fan output but that removes my relay to turn onoff fansvacuums etc. I have checked and checked and checked and M3 M5 they are still set for pin 45. When I upload the new sketch there is a Led just above the fan2 port that comes on when I issue an M3 but it only goes off if I reset the board. I have made the single edit that I can see needs to be changed. In contrast the cmos has high level up to power supply voltage and it may vary. V or 0-12V is analog, so potentially less limiting in terms of resolution, but more expensive to implement. When you see TTL or PWM in regards to a laser youre really saying turn onoff only or on as a percentage of time, off the rest. Im assuming there should be voltage change between 0v and 5v. Usually, it connects with PWM output on your mainboard (3D printer CNC machine or engraving machine).Ĭan I issue a M3 S255 and M3 S0 to test Or do I need to call out the pin like M42 P4 S255. It is important that TTL can be controlled with 3.5-12V output (digital). Yes, guys on aliexpress use and that can means anything, they could even make wrong polarity.įor models 2.1W, 3.5W, 5.6W, 8W, 8.5W TTL has only 1 wire (control wire) and use the same common ground as for the laser power.

They are PWM capable and it seems can be found on PWN extensions pin set. Its name signifies that transistors perform both the logic function (the first transistor) and the amplifying function (the second transistor) it is the same naming convention used in resistortransistor logic (RTL) and diodetransistor logic (DTL).Ī TTL input signal is defined as low when between 0 V and 0.8 V with respect to the ground terminal, and high when between 2 V and V CC (5 V), 21 22. Just to add to the confusion, I tried to look at the 12V output on Fan 0 and im getting the same voltage output at M106 S0 as I am at M106 S255.

Ttl models in forum