Hummingbird Electronics offer dongles to link a CAN network to USB or EIA-232. On the CAN side, the J1939, Devicenet, and CANopen are supported.
The CAN interface of the dongles support bit-rates of 250 kbit/s and 500 kbit/s. Listen-only mode is provided. The USB dongle converts for example J1939 messages to text and transmits this information to a PC or host controller. No driver software is required. The user can use terminal programs such as Hyperterm or Realterm, to view or save the received data. The module is powered via USB.
The EIA-232 dongle converts the CAN message into ASCII strings. The data rate at which each message is sent can be configured. For example, the J1939 speed message is sent 10 times a second by default. When multiple messages are monitored, this can add up to a lot of data, which can be costly to transmit and may not add much value. The CAN-to-serial converter allows the rate at which each message is passed to the vehicle tracker to be specified. For example, the speed message could be sent once a minute and the fuel level message once every 30 minutes. In this way, a balance between cost and benefit can be established, explained the supplier.
For customers wanting to interface to a vehicle network without making any physical connection to the CAN wiring, Hummingbird provides the CAN Crocodile. It can be clipped onto the wire, allowing the data to be read off the CAN-bus without cutting into the wires.
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