15.11.2018, 17:54
Thanks for the reply. I do in fact have the GND and +5V terminals. It is a great idea.
So the connection would be:
1st wire:
LM +5V out <-> pull up resistor <-> open collector on the lock <-> LM digital input
2nd wire:
GND next to the 1wire terminal <-> ground on the lock power supply
Correct?
I assume I need to connect the grounds but that should be fine since both devices are powered by (presumably floating ground) transformers. Right? And I also assume the GND next to the 1wire is connected to the 24V ground which the digital inputs use...?
Any suggestions for the value of the pull up resistor? I am not sure what is the specification of the +5V output. Assuming simple Ohm's law, 10k Ohm resistor should result in 0.5mA draw which should definitely be OK, right?
So the connection would be:
1st wire:
LM +5V out <-> pull up resistor <-> open collector on the lock <-> LM digital input
2nd wire:
GND next to the 1wire terminal <-> ground on the lock power supply
Correct?
I assume I need to connect the grounds but that should be fine since both devices are powered by (presumably floating ground) transformers. Right? And I also assume the GND next to the 1wire is connected to the 24V ground which the digital inputs use...?
Any suggestions for the value of the pull up resistor? I am not sure what is the specification of the +5V output. Assuming simple Ohm's law, 10k Ohm resistor should result in 0.5mA draw which should definitely be OK, right?