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Tuscola, IL | Typically, a planter with 32 rows like in your original question would have two controllers on the planter. One for rows 1-16 and one for rows 17-32. These controllers are wired to each row and receive information from seed sensors, row clutches, down force sensors, etc. They can also receive information like vacuum, bulk fill air pressure and things like that. These are typically 12V systems and signals (like from a sensor) are on a scale of 0-12 volts. The controller knows that a 9 volt signal from the vacuum sensor means, maybe, 4 inches of vacuum.
So, it’s getting these signals and relaying them to the monitor using the CAN system. Communication between the controller and the monitor is done using the 5V that another poster mentioned. The monitor and controller speak the ISO language. So, it can send multiple signals using just the green and yellow wires between them. This is done by using code. For instance, to tell the monitor that the vacuum level is 4 inches, it sends a ‘pulse’ of, say, 1.7V on one wire and 3.3V on the other. It can throw out a pulse prior to that such as 1.1V and 3.9V that is coded within the software to basically tell the monitor that the next pulse is a vacuum level sensor signal so that it doesn’t use it as a row sensor signal and get the two confused. It can also code the signal in a way that it knows whether the signal is coming from controller 1 or 2 on the planter so it isn’t confusing row 2 with row 18.
Keep in mind this is all happening, basically, at the speed of light with who knows how many signals being sent almost simultaneously.
Edited by CASE3594 12/27/2020 01:19
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ISOBUS - CANBUS (explanation for dummy’s)
