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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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
| 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}
Background information on Un-shrouded Headers, or Shrouded Headers.
| 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.
| 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}
| 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.
Navigation: Engineering Home > Interface Buses > Cabled Interface Standards > Vehicle Standards > CANbus Interface > CANbus Pin Outs
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