The types of communication available to the PHD family are Controller Area
Network (CAN) communication and USB host.
6.1. Controller Area Network
The PHD28 and PHD50 have 1 Controller Area Network (CAN) communication
port available. The PHD70 has 2 CAN communication ports available.
The PHD family hardware provides controller area network (CAN)
communication according to the SAE J1939 specification, making the PHD
compatible with any CAN-based protocol through software.
CAN communication is used to communicate the status of multiple modules that
are connected together in the same network.
6.1.1. CAN capabilities
The CAN communicates information at a selectable rate from 125 kbps to 1000
kbps. Lack of regular CAN communication is an indication that there is either a
problem with a module in the network, or a problem with the CAN bus.
CAN communication provides a feature called Wake on CAN, which is a way to
provide power control to the PHD.
Wake on CAN provides a low-current sleep mode that turns on the PHD when a
CAN message is received by the module.
It is not possible to filter messages that are used to turn on the PHD using Wake
on CAN. For this reason, any message will turn on the PHD. The application
software must be written to determine how the PHD will behave when it is turned
on.
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