Figure 8. Circuit Board Connections
Ground Connection
The RDP-110C grounding point consists of a 10-32 threaded hole located on the back of the enclosure. The
ground connection should be made with wire no smaller than 16 AWG (1.5 mm
2
).
Connector Wiring
Note the following guidelines when wiring the circuit board connector:
• Connections should be made with wire no smaller than 20 AWG (0.5 mm
2
)
• Maximum conductor size for each terminal is 12 AWG (4 mm
2
)
• Strip the insulation from each wire to reveal 0.28 inches (7 millimeters) of exposed conductor
• Apply no more than 4.4 in-lb (0.5 N•m) of torque to each terminal screw
RS-485 Communication Connections
Twisted-pair conductors are recommended for the communication wiring between the DGC and RDP-110C.
Overly long wiring runs may impair communication between the DGC and RDP-110C. Do not exceed an RS-485
conductor length of 4,000 feet (1,219 meters).
RS-485 Terminating Resistor
The RS-485 communication connection is internally terminated with a 100 Ω resistor. Connecting multiple display
panels may necessitate removal of this terminating resistor (R65). R65 is located on the back side of the circuit
board so the circuit board must be separated from the front panel in order to remove the surface-mount resistor.
Remove the five nuts from the front panel studs to free the circuit board and gain access to R65. Figure 9
illustrates the location of R65 on the back side of the circuit board.
Consult standard TIA/EIA-485 for guidance on the electrical requirements of multipoint communication systems.
Figure 9. RS-485 Terminating Resistor Location
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