Canopen Cabling And Connector Pin Assignment Micro


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]

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

Pin #Signal namesSignal Description
1ReservedUpgrade Path
2CAN_LDominant Low
4ReservedUpgrade Path
5CAN_SHLDShield, Optional
6GNDGround, Optional
7CAN_HDominant High
8ReservedUpgrade Path
9CAN_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.

Pin #Signal namesSignal Description
1ReservedUpgrade Path
2GNDGround, Optional
3CAN_LDominant Low
4CAN_HDominant High
6ReservedUpgrade Path
7ReservedUpgrade Path
8CAN_V+Power, Optional
9ReservedUpgrade Path
10ReservedUpgrade 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

RJ45 Pin #RJ10 Pin #Signal nameSignal Description
12CAN_HDominant High
23CAN_LDominant Low
4-ReservedUpgrade Path
5-ReservedUpgrade Path
6-CAN_SHLDCAN Shield, Optional
81CAN_V+Power, Optional

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

{Industrial CANbus Index}

7-Pin Open Style, CAN Bus Pin Out

Pin #Signal namesSignal Description
2CAN_LDominant Low
3CAN_SHLDShield, Optional
4CAN_HDominant High
5CAN_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}

Navigation: Engineering Home > Interface Buses > Cabled Interface Standards > Vehicle Standards > CANbus Interface > CANbus Pin Outs

Modified: 2/26/12
Copyright © 1998 - 2016 All rights reserved Larry Davis

The CiA 303-1 recommendation has been published as version 1.9. Besides some minor editorial improvements, it contains the pin assignment for Micro-Fit 3.0 connectors.

CAN in Automation has listed in its new version of the CiA 303-1 recommendation Molex’s Micro-Fit 3.0 connector. The recommended pin assignment for CAN_H and CAN_L uses pin 2 and pin 3. Pin 1 is for the optional CAN shield and pin 4 should be connected to CAN GND. When the CAN device is galvanic isolated, pin 5 and pin 6 are used for powering the CAN transceiver. The recommendation can be downloaded free-of-charge from the CiA website.

The Micro-Fit family offers 8,5 A with a 3-mm pitch, delivering power in a compact package in wire-to-wire and wire-to-board configurations. OEMs often need power connectors in space-constrained applications. The Micro-Fit 3.0 BMI Connectors are designed for blind-mating applications. They allow mating misalignment (per product drawing). In hard-to-reach applications, such as drawers or fan assembly trays, connectors need to be mated and unmated without being seen. Doing so can cause damage to the connector and/or terminal and consume valuable labor time.

The Micro-Fit 3.0 TPA receptacle helps prevent failure in end products by offering terminal position assurance (TPA). The integrated TPA reduces terminal back-out by providing locking redundancy. For example, assemblers cannot insert the TPA unless the terminal is properly inserted. When OEM workers assemble connectors incorrectly (e.g., they do not fully engage the terminal in the housing), terminal back-outs can occur, causing end-product failure.

Micro-Fit 3.0 CPI (Compliant Pin) connectors provide a compliant pin interface while maintaining all the features of the normal Micro-Fit 3.0 Connector. The robust eye-of-the-needle design provides a reliable interface when recommended board layouts are followed. The Micro-Fit 3.0 CPI Header mates with Micro-Fit 3.0 Receptacle, allowing running changes as boards transition from solder to press-fit applications. For lower applied costs, OEMs often prefer a compliant pin connector over one that requires soldering.

Micro-Fit 3.0 RMF (Reduced Mating Force) terminals are designed for applications needing lower engagement and disengagement forces or when the units are cycled frequently. The pre-lubricated version can be mated up to 250 times and fit into standard Micro-Fit 3.0 housings. Applications often require rugged terminals and lower mating force to reduce operator fatigue during assembly and/or to withstand high-mating cycles.


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