© 2021 Carrier
13
WIRING
Terminals
The recommended cable (59-565) contains four wires: two power wires (18AWG) and two communication
wires (22AWG) in a twisted pair, plus a bare drain wire. This cable is available by the foot.
The figures below show the connectors for both power and communications.
NXTSD507HD
NXTSD512HD
The connector labeled 24V supplies the 24VDC power to the
unit. The connection is polarity sensitive and is designated on the
legend. It is recommended to use wire between 16AWG and
18AWG for this connection. The connector is a two-position
5.08mm pluggable terminal block with screw terminals.
The connectors labeled 1 through 4 are the RS-485 serial ports
used for Modbus RTU communication to the connected devices.
These connections are polarity sensitive and are designated on the
legend. It is recommended to use a twisted pair wire between
18AWG and 22AWG for this connection. These connectors are
three-position 5.08mm pluggable terminal blocks with screw
terminals.
The connections to the NXF4000 or PPC4000 are to the
connectors P2 for power and P12 for communications. Refer to
bulletin
NXF-4100
for further clarification on terminal ratings,
power supply considerations and any other issues that may not be
covered in this bulletin. Refer to the table below for the required
wiring connections between the connected controls and the
screen.
NXF4000/PPC4000 terminal blocks
