Setra System Model SRMD - Manual (Page 3)

3.0 WIRING TO ThE DISPLAyS
Shown in Fig. 3 is a wiring diagram and picture of the back of the mounting
plate. Note that each display has a terminal strip. If you are using field sensors
that are not Setra’s SRH humidity/temperature sensors, then calibrate the display
according to Section 4 before completing the wiring shown here.
Fig. 3
Wiring:
+E - Excitation, 24 VAC
COM - 2 terminals connected together, wire
to 24 VAC and to common of the field sensor
+S - wire to the field sensor
Input Wiring