![background image](http://html1.mh-extra.com/html/campbell/sdm-sio2r/sdm-sio2r_product-manual_3760120020.webp)
(p. 17) shows all the power pass-through connections on the SDM-SIO2R. Note that
there are two power pass-through connectors. One for Sensor 1 and one for Sensor 2.
Table 6-4: SDM-SIO2R power pass-through terminal labels and functions
Power pass-through
V-
V+
G
12V
1
2
3
4
Table 6-5: SDM-SIO2R functional description of input connections
Pin
Case text
Connection to
Description
1
V+
Power supplies
Power supply 0-30V AC/DC
2
V-
Power supply return 0-30V AC/DC
3
12V
Power 12V (powers internal electronics
and LEDs)
4
G
Power supply ground
5
C1
Data logger
SDM_Data
6
C2
SDM_Clock
7
C3
SDM_DataEnable
SDM-SIO2R Serial Input/Output Module with Switched Sensor Power
17