Hi to all and happy holidays (or Mary Christmas)
I need your help about if I can connect my arduino 3,3v (esp32 s3) + SN65HVD230 CAN Bus Transceiver Controller 3,3V
with a bus system that uses 24v
And this
Can I connect my H L channels from SN65HVD230 module directly to H L channels of the buss line I want to read?
Have I to connect the two grounds together? (my gnd for powering my arduino with the Gnd of the 24v of the canbus line of the system I want to read)
Thanks in advance
On professional gear you would normally expect to see a specific "signal ground" pin for use with comms interfaces.
Is the CAN interface floating or referenced to one (or both) 24v supplies? Are the two 24v supplies isolated from each other? Is either power supply connected to chassis ground (or signal ground if it exists)?
Unfortunately I don't know all these details..
For the moment I can see only from the manual and not the actual device and in case be in the device I am not sure if I can see if all these you are talking about are like you say.
The device is a professional product, a nidec elevator control.
I know that has 2 different can channels. One for the floor calls and one for car/cabin calls.
My question is more in theoritical base if I could connect it and how.
Just to check one chenmel only each time.
You can use a scope referencing ground and measure the CAN signals. I expect they will be in the 2.5V range not 24V. A multimeter may work as well.
Theoretically yes it is possible, just connect CANH, CANL and ground.
It a real elevator system I would use an isolated CAN transceiver.
The question is does it comply with the CAN specification.
I am not sure but in the lift industry they are using CANopen and specific the CANopen-Lift.
at the moment i didnt find in the manula any reference about what Can protocol they are using
Here are some more pics about the connection of the devices as described in the manual
..
It does not matter, if it's CAN compliant then you can in theory connect your module.
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