CAN Bus

Controller Area Network
CANopen Pinout



[CAN Bus 9-Pin D] [CAN Bus 10-Pin Header] [CAN Bus RJ-Style]
[CAN Bus 5-Pin Circular] [CAN Bus 7-Pin Open Style] [CAN Bus Round Style] [CAN Bus Round Flange Style]
[Other Interface Buses]
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CAN Bus Description

The Controller Area Network (CAN) specification defines the Data Link Layer, ISO 11898 defines the Physical Layer.
The CAN bus is a Balanced (differential) 2-wire interface running over either a Shielded Twisted Pair (STP), Un-shielded Twisted Pair (UTP), or Ribbon cable.
The pin outs on this page are associated with the CANopen protocol. For additional information refer to the main CAN Bus page.
CANbus is used as a vehicle bus, additional vehicle Buses refer to the Automotive Bus page.
CANbus is also used as an Industrial Field bus, for other Field Buses see the Field Buses page.

Related pages;
Listing of 'D' Connectors Manufactures
Listing of Cable Manufactures

9-Pin D, CAN Bus Pin Out





9-Pin Serial CANbus D-Connector
9 Pin (male) D-Sub CAN Bus PinOut
Pin # Signal Names Signal Description
1 Reserved Upgrade Path
2 CAN_L Dominant Low
3 CAN_GND Ground
4 Reserved Upgrade Path
5 CAN_SHLD Shield, Optional
6 GND Ground, Optional
7 CAN_H Dominant High
8 Reserved Upgrade Path
9 CAN_V+ Power, Optional

Some systems may use pin 8 as an error line, to indicate an error on the net.
Also see 9-pin Dsub Insert Locations.

{Back to Industrial CANbus Index}


10-Pin header, CAN Bus Pin Out

Background information on Un-shrouded Headers, or Shrouded Headers.


10-Pin Header CAN Bus PinOut
Pin # Signal Names Signal Description
1 Reserved Upgrade Path
2 GND Ground, Optional
3 CAN_L Dominant Low
4 CAN_H Dominant High
5 CAN_GND Ground
6 Reserved Upgrade Path
7 Reserved Upgrade Path
8 CAN_V+ Power, Optional
9 Reserved Upgrade Path
10 Reserved Upgrade Path

Editor note; I am unsure what the function of pins 9 and 10 are.
The cable shield is optional with CanBus, so may or may not be used.
As with any interface standard, a pin that is reserved in one revision, may be used in the next version.
So leaving them as reserved is the safe course, but the incoming cable should be examined to determine the function.
According to the CANopen connector pin assignment [CiA draft DR-303-1];
pins 9 and 10 are reserved supporting direct connection to a 9-pin D connector.

{Industrial CANbus Index}


RJ-Style, CAN Bus Pin Out





RJ-45 CANbus Connector
RJ10, RJ45 CAN Bus PinOut
RJ45 Pin # RJ10 Pin # Signal Name Signal Description
1 2 CAN_H Dominant High
2 3 CAN_L Dominant Low
3 4 CAN_GND Ground
4 - Reserved Upgrade Path
5 - Reserved Upgrade Path
6 - CAN_SHLD CAN Shield, Optional
7 - CAN_GND Ground
8 1 CAN_V+ Power, Optional

Listing of Telcom Connectors Manufactures {RJ10, RJ11, RJ45 phone jacks}

{Industrial CANbus Index}


7-Pin Open Style, CAN Bus Pin Out





7-Pin Open Style CAN Bus PinOut
Pin # Signal Names Signal Description
1 CAN_GND Ground
2 CAN_L Dominant Low
3 CAN_SHLD Shield, Optional
4 CAN_H Dominant High
5 CAN_V+ Power, Optional

4-pin Open Style Connectors either use pins 1-4 (Version A) or pins 2-5 (Version B). 3-pin Open Style Connectors use pins 2-4.
The bus node provides the male pins of the connector.

{Industrial CANbus Index}


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Modified: 2/26/12
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