Campbell Scientific SDM-CAN Datalogger to CANbus Interface - Manual (Page 13)

SDM-CAN Datalogger-to-CANbus Interface
Please see Section 3, Programming CR10X, CR7 and CR23X Dataloggers to
use the SDM-CAN, before using address F (33 base 4) as this address is often
used as a ‘group trigger’ to synchronize measurements by several SDM
devices.
The switch is positioned on the right-hand side of the case, so you may have to
remove the mounting bracket to gain access to this switch.
TABLE 2-1. Switch Position and Addresses
Switch Setting Base 4 Address
0 00
1 01
2 02
3 03
4 10
5 11
6 12
7 13
8 20
9 21
A 22
B 23
C 30
D 31
E 32
F 33
2.2 Internal Jumper Settings
The SDM-CAN interface is fitted with a number of jumpers which configure
the connection to the CAN network.
Prior to setting these jumpers you need to give some consideration on how best
to connect the SDM-CAN interface to the network:
1) Decide whether the CAN network is already terminated, or if the SDM-
CAN needs to provide termination. In most instances the network will
already be terminated and so the default setting is no termination.
2) Decide whether to operate the SDM-CAN in a mode where it is isolated
from the CAN network. This is the ‘safest’ mode of operation as it
minimizes the risk of corrupting the CAN data by the formation of
grounds loops which could inject noise onto the CAN-Bus. The default
setting is to run in isolated mode.
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