CAN Bus Wiring

All devices are connected to the PowerView3 via a CAN bus. The communication via the bus is effected using the CANopen® protocol with a bit rate of 250 kbit/s.

General Information on CAN Bus Wiring

The wiring of the CAN bus requires three conductors (CAN Hi, CAN Lo and CAN Com). The conductors for CAN Hi and CAN Lo must be twisted wires. At a bit rate of 250 kbit/s, the bus may only have a maximum wire length of 250 m (820') and must be terminated at both ends by a terminating resistor of 120 Ω between the CAN Hi and CAN Lo conductors to prevent reflections.

The diagram shows an example of the wiring for four devices:

 

First device

Second-to-last device

CAN-Bus

 

Second device

Last device

 

CAN bus wiring

Note the following when connecting the CAN bus:

  • Each bus end must be fitted with a terminating resistor of 120 Ω (see drawing).
  • The maximum wire length depends on the bit rate:

Bit rate

Maximum wire length

Maximum length of a stub

Maximum length of all stubs

1 Mbit/s

25 m (82')

1.5 m (5')

7.5 m (25')

800 kbit/s

50 m (164')

2.5 m (8')

12.5 m (41')

500 kbit/s

100 m (328')

5.5 m (18')

27.5 m (90')

250 kbit/s

250 m (820')

11 m (36')

55 m (180')

125 kbit/s

500 m (1,640')

22 m (72')

110 m (360')

50 kbit/s

1,000 m (3,280')

55 m (180')

275 m (902')

 

  • Only use cables that are specified by the manufacturer for use in the CAN bus.

 

The PowerView3 is delivered with a bit rate set to 250 kbit/s.

Pin Assignment of the Interface of the CAN Field Bus

CAN-Schnittstelle

Pin

Assignment

Description

1

Com

Common ground for CAN and RS485 group

2

Term

Bridge with Hi for CAN bus termination

3

Hi

CAN Hi

4

Lo

CAN Lo

5

Term

Bridge with Lo for CAN bus termination

Pins 6 to 12 are reserved for the RS485 interface and are without function.

 

CAN bus termination

The PowerView3 has a built-in 120 Ω terminating resistor and must therefore be the last device in the CAN bus.

If the PowerView3 is not the last device in the CAN bus, the cables of connection 2 and 5 must be separated.

 

The arrangement of the interfaces of the PowerView3 can be found in the chapter Interfaces.

Connection of the CAN Cable

If needed, use the supplied wire end ferrules to connect the strands to clamps. The conductors of the CAN cable included are assigned as follows:

Color

Assignment

Green

Ground for CAN (Com)

White

CAN Hi

Brown

CAN Lo

Yellow

Not assigned

 

The connector for the shielding must be connected with one of the four shielding connections at the back of the PowerView3.

Rückseite

The other end of the conductor for the shielding must be suitably fitted.

Connection between Ignition Controller and PowerView3

As shown in the following illustrations, you can connect the PowerView3 directly to the MOTORTECH ignition controller (MIC3, MIC3+, MIC4, MIC4+, MIC5, MIC5+) using the CAN cable delivered with the PowerView3. To do so, you need to insert the connector into the CAN interface on the PowerView3. On the ignition controller, connect the color-coded conductors of the CAN cable to the correct CAN interface connections.

Ignition controllers
with service cover

 

Ignition controllers
without service cover

Verkabelung_PW3-MIC4

 

Connector for CAN interface on PowerView3

0201_Verkabelung_PW3-MIC

 

 

 

 

CAN cable

 

 

 

 

 

CAN interface on the ignition controller

Settings on the Devices

All connected devices are designated as nodes on the CAN bus. Each node is identified by a CANopen®‑node ID. These node numbers must be indicated both in the connected devices as well as in the configuration of the PowerView3. Refer to the operating manuals of the respective devices for instructions on how to set the node ID for each device and to determine if further settings must be made to communicate via the CAN bus.

A node ID can only be assigned once within a CAN bus and must be a number between 1 and 127. Note that some devices use several node numbers. The node numbers must be assigned in the configuration after start-up of the PowerView3.

 

Overview of the CAN bus

Setting up the CAN field bus requires the following settings:

  • Activate CAN interface on the devices if applicable.
  • Assign unique CANopen®‑node IDs to the devices.
  • Set bit rate of all devices to 250 kbit/s.

   

CANopen® protocol

If you require information on the CANopen® protocol, contact your MOTORTECH contact person.