Wiren Board 5: CAN-ISO Extension Module

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Hardware

CAN extension module

The extension module uses MCP2551 physical layer interface. CAN interface signals are galvanically isolated from the controller.

Can be installed only to MOD1 extension slot.

The module contains a 150 Ohm terminator between the H and l lines. To enable it, you need to close the jumper on the top side of the Board.

Operation in UART-CAN mode

The WBE-I-CAN-ISO module operates in UART-CAN mode. The UART-CAN bus (also called sometimes simply CAN or RS-CAN) uses the physical can layer for the half-duplex serial port of the UART.

The UART-CAN bus is mainly used in metering devices such as Mercury energy meters.

In UART-CAN mode, the module can be installed in any expansion slot, so you can install two WBE-I-CAN-ISO modules

Pinout

CAN signals are wired to O1-O3 terminal blocks.

Pinouot:

Terminal	Function
O1	CAN L
O2	CAN H
O3	CAN GND (Isolated GND)

Configuration

CAN extension module

Configuration is set in the web interface: Configs section => Hardware Modules Configuration.

Для режима CAN: в Internal slot 2 выбрать "WBE-I-CAN-ISO" и нажать Save.

Для режима UART-CAN: убедиться, что в соответствующем слоте (Internal slot 1 или Internal slot 2) стоит значение "None".

Устройство определяется сразу же, перезагрузка не требуется.

Operation

To be done

В режиме UART-CAN модуль работает идентично модулю расширения RS-485, см. соответствующее описание.

Таблица совместимости