DB9 RS232 Terminal Block CAN Terminator

◇ DB9 9-Pin Terminal Block CAN BUS Adapter with 120 Ohm termination resistor between CAN_H and CAN_L, Converts a DB9 female connector into a 9-pin terminal block, Screwless terminal block with spring clamps for easy and fast wiring.

◇ DB9 RS232 Terminal Block CAN BUS provides complete 9 signals directly corresponding to the 9 pins of the DB9 female connector.

◇ The CAN Terminator can be used where the CAN cable or CAN node at the end does not have internal termination.

In the CAN (Controller Area Network) system, DB9 is a connector type, and the termination resistor is used for the terminal node. The CAN bus is usually a twisted pair system, and the terminal resistor is used at the two endpoints of the CAN network and has the following two main functions:

Impedance matching:The terminal resistor helps match the impedance of the bus to ensure that the signal is transmitted on the bus No reflections occur during transmission. The resistance of the terminating resistor is usually 120 ohms, which matches the characteristic impedance of the CAN bus.

Suppress signal edges:Termination resistors help suppress signal edges on the bus and prevent signal reflections from causing signal distortion. In the CAN system, the terminal resistor can reduce the amplitude and edge changes of the signal and ensure stable transmission of the signal. In a CAN network, a terminating resistor is usually required between only two nodes. At the two endpoints of the network, there is a resistor on one side and not on the other side. This ensures impedance matching on the bus and helps maintain signal quality. If terminating resistors are provided at every node in the network, signal reflections and other communication problems may result. Therefore, the correct configuration of the terminal resistor is very important to ensure the stability and reliability of the CAN bus system.

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