Winco RDP-110 - Manual (Page 20)

4-2 RDP-110 Installation 9318100990 Rev E
CONNECTIONS
CAUTION
Be sure the controller battery input polarity is wired correctly. Reverse polarity battery
power will not allow the unit to be DC powered. Incorrect wiring may result in damage to
the remote display.
NOTE
Be sure the remote display panel is hard-wired to earth ground with no smaller than 16
AWG copper wire attached to the chassis terminal on the rear of the remote display. An
additional ground connection is on the conduit box.
Except as noted above, connections should be made with minimum wire size of 20 AWG. Be sure to use
the correct input power for the power supply. Figure 4-2 is a typical connection diagram.
Each RDP-110 internally terminates the RS-485 connection with a 100-ohm resistance. Connecting
multiple remote display panels may require modification of this terminating impedance. The internal
terminating resistance can be eliminated by removing R65 from the printed circuit board. R65 is located in
the lower left corner near the RS-485 terminal strip. Consult the EIA-RS-485 standard for a complete
discussion.
Figure 4-2. RDP-110 Typical Connection Diagram