Campbell Scientific SDM-CAN Datalogger to CANbus Interface - Manual (Page 9)

SDM-CAN Datalogger-to-CANbus
Interface
1. Introduction
The SDM-CAN interface is designed to allow a Campbell Scientific datalogger
to sample data directly from a CAN-Bus communications network and thereby
allow such data to be stored along with, and in synchronization with, other data
values measured directly by the datalogger.
To use the SDM-CAN device it is assumed that you have a full working
understanding of the CAN network you wish to monitor. While there are
moves to standardize CAN networks for different types of applications, the
SDM-CAN device is designed to be as generic as possible thus allowing use in
a wide range of applications, including research and development, where you
may be working outside the normal standards.
As a result you will need to know details of the electrical configuration of the
network, the speed and CAN standard in use, plus knowledge of the identifiers
of the data packets that are of interest and the way in which data is encoded
within those packets at the binary level. This information may need to be
obtained from the designers of the network, from proprietary documentation or
from the standards to which a network claims to comply.
Campbell Scientific cannot provide full technical support in the understanding
and decoding of data on all types of CAN networks.
FIGURE 1-1. SDM-CAN CAN-Bus Interface
1.1 General Description
The SDM-CAN forms an intelligent interface between a Campbell Scientific
datalogger and a CAN-Bus communications network. The SDM-CAN is
configured by the datalogger under the control of the user’s datalogger
program.
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