Detcon 840-RD - Manual (Page 9)

4.2.2 DC Power
For optional DC power input, connect 11.5-30 VDC to the terminals labeled J8 “DC IN” in Figure 3 &
Figure 4. This input can be used for primary power or back-up power in the event of a VAC power failure.
115VAC/220VAC
External
VDC
Input VDC ON/OFF
VIN
MOTHER BOARD POWER INPUT
External
VAC
Input
J8
+
-
J2
SW4
SW1
VAC ON/OFF
F2
BATTERY
RESTORE
VSS
VIN
SW3
BATTERY
ON/OFF
SWOV
BATT2
BATT1
DC POWER
SUPPLY
TO FROM
VSS
VIN
SW2
PS1
PS2
Figure 3 Power Input Schematic
4.2.3 Serial connection from the Model 840 Controller
The serial connection from the Model 840 Controller should be terminated at J10 the RS-485 input terminal
of the Model 840 Motherboard, see Figure 4. If applicable, the shield wire should be terminated at the RS-
485 connector labeled JP1 “SHLD TO GND on the motherboard PCB.
Model 840-RD Operator Manual Rev. 0 Page 5 of 14