CAN T-Adapter

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The CAN T-Adapter creates tap connections to data cables and ground within the CAN bus to be able to connect CAN nodes. In this case, the CAN node will not terminate.

Specifications & Features

Name:  CAN node T Connector

Connector: 2x DSub9 socket, 1x DSub9 plug

It contains a 120 Ohm terminal resistor;

Special attention should be paid to occasions where high-power motors are running, or other occasions where the voltage on the power supply line may change when the equipment is turned on or off;

Why does the CAN bus have two 120Ω terminal resistors?

The ends of the CAN bus must be connected to the terminal resistance to work normally. The terminal resistance should be the same as the impedance of the communication cable. The typical value is 120 ohm. Its role is to match bus impedance to improve the anti -interference and reliable behavior of data communication.

The role of the terminal resistance is to absorb signal reflection and echo, and if the impedance is not continuous and the non -matched, the signal reflection will be generated, which will interfere with the transmitted signal.

If the terminal resistance is added to the two separate lines, it is equivalent to a state of opening. This connection method will cause a single line of impedance to be more discontinuous, and suddenly becomes 0 at the end, which will cause reflection to double.

The two 120 euros of the two 120 Euros added by the high -speed CAN actually simulate the characteristic impedance generated on the transmission line when the wire beam is infinitely connected (rather than the actual impedance). type. The reason why the high -speed CAN has to add a terminal resistance is because when the high -frequency signal is transmitted, the signal wavelength is relatively short relative to the transmission line. Do not reflect after the end.

The reason why low -speed CAN does not add terminal resistors is because the wavelength is relatively long, and the reflection and echo are weak. However, the control unit of the low-speed CAN system will have its own independent terminal resistance. It is not connected between the CAN-HIGH wire and the CAN-LOW wire, but between each wire or between the+5V power supply. If the battery is powered off, the resistance is gone, and the resistance cannot be measured at this time.

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