CAN FD interface

The Interface Extension Module ES132.1 has two CAN interfaces (CAN1 and CAN2) at the nine-pin D-SUB connection and a LEMO connection with a standard Ethernet interface (10/100 Mbit/s in accordance with IEEE 802.3) and an integrated power supply via the connected ETAS module. The two CAN interfaces are independent CAN channels with separate CAN FD controllers.

Operating modes

The CAN1 and CAN2 interfaces can be configured independently of one another in the application software for the following operating modes:

• CAN

• ISO-compliant CAN FD

• Non-ISO-compliant CAN FD

Bus terminating resistor

According to the CAN specification, one bus terminating resistor of 120 ohms is required at each of the two open ends of the bus. It must be connected to the cable or the plug. Some CAN networks are already terminated (for example in a vehicle), so no additional termination is required. ETAS offers cables and terminating resistors of 120 ohms to set up CAN networks.

Minimum requirements for the CAN connection

At least the following connections are required in order to establish a connection to the CAN network:

• Pin 2 CAN Low

• Pin 7 CAN High

• Pin 6 or Pin 3 GND (either one of the pins can be connected)

The ground connection (GND) must be identical to the ground connection of the other CAN nodes on the bus.