2021-04-17, 10:44 AM
Hello Techstyle
thanks for your documentation. but please add something about Termination of the CAN Bus. This involves 2 Terminators (just normal Resistors a 120Ohm). They should be at both Endpoints of the Bus, and ONLY there. Their Function is to minimize the Reflectons of the Endpoints.
Now if you put an new Device inside your Bus be shure to remove it´s intern Restistor between the H & L Contacts. Most CAN Hats have these default active. You are able to measure the Resistor between H & L - if ist ca. 120 Ohms the you have to remove it! Be shure to disable the Power before the Measurement, otherwise you get irregular Results.
To be shure your Boat CAN-Bus is correct terminated, Power it down first - and the measurement shoult be ca. 60 Ohm. (2x120Ohm = 60Ohm). You can add many Devices inbetween, but disable their internal Resistors first.
Holger
thanks for your documentation. but please add something about Termination of the CAN Bus. This involves 2 Terminators (just normal Resistors a 120Ohm). They should be at both Endpoints of the Bus, and ONLY there. Their Function is to minimize the Reflectons of the Endpoints.
Now if you put an new Device inside your Bus be shure to remove it´s intern Restistor between the H & L Contacts. Most CAN Hats have these default active. You are able to measure the Resistor between H & L - if ist ca. 120 Ohms the you have to remove it! Be shure to disable the Power before the Measurement, otherwise you get irregular Results.
To be shure your Boat CAN-Bus is correct terminated, Power it down first - and the measurement shoult be ca. 60 Ohm. (2x120Ohm = 60Ohm). You can add many Devices inbetween, but disable their internal Resistors first.
Holger