PCM-CAN-2 WinSystems Dual-Channel Control Area Network PC/104 Module

The WinSystems PCM-CAN-2/1(-ISO) Series Control Area Network PC/104 Modules use two NXP SJA-1000 CAN controller ICs with advanced features for use in automotive and industrial applications. This board has also been manufactured in a single channel version, called the PCM-CAN-1.

CAN is a serial, asynchronous, multi-master communication protocol for connecting electronic control modules, sensors and actuators in automotive and industrial applications. The signal is encoded in a non-return-to-zero (NRZ) pattern and is sensed by all nodes. The CAN bus physical interface is similar to RS-485 two-wire, half-duplex communications.

On CAN bus systems, signal integrity is achieved by matching the impedance of the transmission line and thereby minimizing reflections. A jumper selectable, onboard 120 ohm resistor has been manufactured for this purpose.

Each CAN channel has its signal and power wired to two 10-pin 0.100 inch right angle headers, which allow endpoint or daisy chain connection. The optional WinSystems' cable, CBL-123-G-1-1.0, extends and converts it to a 9-pin D-sub type male connector to connect to the control area network.

The PCM-CAN-2 is I/O mapped and each CAN controller occupies either (32) or (128) adjacent I/O registers depending on CAN 2.0A (BasicCAN) or CAN 2.0B (PeliCAN) mode selection. The base address and mode is jumper selectable. When two CAN controllers are present, they share a single user configurable interrupt, which is also jumper selectable for IRQ 3-7, 9-12, 14, or 15.

WinSystems has manufactured a version of this board populated with high-speed isolated couplers and transformer isolated power supplies called the PCM-CAN-2-ISO. Each CAN channel can supply isolated 5VDC power to the respective interface or take isolated 5-12VDC power from the interface. Each channel has an independent on-board isolated +5VDC power supply and jumper connections for providing power to or receiving power from the CAN interface connectors. Each channel can provide up to 150mA of 5VDC power to the CAN interface or alternately accept power in the range of 5-12VDC from the interface. The power supply has overvoltage, overcurrent, and short circuit protection.