Can Bus Cable Impedance

The can bus cables are designed with materials that meet or exceed txl requirements and the impedance return loss and attenuation requirements of the network system.

Can bus cable impedance.

The termination resistors on a cable should match the nominal impedance of the cable. Allied wire cable inc. The distances from one end of the bus to the other will be fairly short 3 to 10 meters or so. This is because communication flows both ways on the can bus.

Therefore you should use 120 î resistors for termination. However be careful in this matter. On can bus systems balanced line operation where current in one signal line is exactly balanced by current in the opposite direction in the other signal provides an independent stable 0 v reference for the receivers. I could terminate with 100 ohms 110 ohms or 120 ohms.

What does matter on the physical layer is the impedance of the bus. The shielding reduces the harmful effect of emi or rfi interference. Can l is pin 2 and can h is pin 7 on the standard 9 pin d sub connector. Is a distributor and manufacturer of custom cables coaxial cable flexible cables and a complete line of electrical connectors and heat shrink tubing.

Therefore you should use 120 ω resistors for termination. We also stock sab wire and cable products. This is because communication flows both ways on the can bus. Can l is pin 2 and can h is pin 7 on the standard 9 pin d sub connector.

Iso 11898 requires a cable with a nominal impedance of 120 ω. 100 ohms would match the cat5 cable but the can transceivers would be seeing a lower impedance. Twisted unshielded or shielded pair designs are available in both. Can bus data cables delivering signal supplying power for transportation applications prestolite wire brand can bus data cables are designed to the sae j1939 specification utilizing proprietary materials specifically designed for exceptional electrical performance.

Ul approved can bus cable is part of allied wire cable s extensive stock of electrical wire and cable. Geometry and connection of the double shielded can cable at the double shielded line the user has to take special care that the outer shield is connected with the. I see the can spec has a definition for rj45 connectors but the cable impedance is the issue. If you are designing both nodes then the 120 ohms resistors are indeed necessary and it s ok that you included them on your board.

The termination resistors on a cable should match the nominal impedance of the cable. Iso 11898 requires a cable with a nominal impedance of 120 î.