Campbell Scientific SDM-CAN Datalogger to CANbus Interface - Manual (Page 16)

SDM-CAN Datalogger-to-CANbus Interface
FIGURE 2-3. SDM-CAN Isolation disabled
2.3 Connection to the Datalogger and Power Supply
To allow communication between the SDM-CAN and a datalogger, firstly
connect it to the datalogger’s SDM port, and then connect to a 12V power
supply. Both the datalogger and the SDM-CAN 12V power supply must share
a common ground.
The SDM port is provided in different ways on different dataloggers:
CR10X and CR23X – use the C1, C2 and C3 control ports.
CR7 – a special SDM terminal block is provided as part of the SDM upgrade
kit. This terminal block is fitted on a small module adjacent to the 9 way
‘Serial I/O’ connector on the front of the 700 control module. The connections
are labeled C1, C2 and C3.
CR5000 – use the port connections labeled SDM-C1, SDM-C2 and SDM-C3.
CR9000 – connections are made via the 9 way, ‘CSI Serial I/O’ connector on
the 9080 PAM card. Pins 6, 7 and 8 are used as C3, C2 and C1 respectively.
Pin 2 is ground. Campbell Scientific offers connection modules for this port
which allow access to the SDM function as well as retaining normal function
of the serial port, please contact your local sales office for further details.
The SDM-CAN requires a nominal 12V power supply connection (7-26V)
rated at 150mA. Normally the datalogger supply can be used for this feed. A
connection to ground is also required. If the 12V supply is separate from the
datalogger, both the ground of the supply and datalogger must be connected
together.
The SDM and power connections are made to a black terminal block on the
left-hand side of the SDM-CAN interface. This terminal block has special
spring loaded terminals which are simple to use and highly resistant to
loosening in high vibration environments. To open the terminal simply insert
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