Campbell Scientific SDM-CD8S 8 Channel Solid State DC Control Module - Manual (Page 10)

SDM-CD8S 8 Channel Solid State DC Control Module
EXTERNAL
8 TO 26 VDC
+ —
SDM-CD8S DATALOGGER
GND
C1
C2
C3
Connection to External Supply
SDM-CD8S DATALOGGER
12 V
C1
C2
C3
GND
Connection to Datalogger Supply
FIGURE 2. Connection block diagrams
TABLE 1. Datalogger to SDM-CD8S Connections
SDM-CD8S Datalogger Function
PWR 12 V on datalogger or
8 to 26 V external supply Power
Logic Gnd Gnd Common ground
C1 C1 (Control Port 1) Data
C2 C2 (Control Port 2) Clock
C3 C3 (Control Port 3) Enable
4.1.2 Controlled Device Connections
In most applications, the SDM-CD8S acts as a switch (controllable break) in
the ground return of the circuit powering the controlled device. Figure 3
shows an example.
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