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Central Control Device (Touch Screen Controller) Installation Manual
Termination resistance setting
•RS-485 termination resistance setting ...................Set at both ends of the RS-485 communication line. Set one end at the main
unit and the other end at the interface. The termination resistance of the main
unit is already set as a factory default. Refer to the interface installation
manual to set the termination resistance of the interface.
• LINK termination resistance setting.......................For the central control wiring (Uh line), set the two terminating resistors at
both ends of the wiring between this Unit and the air conditioner to ON
"Close" as much as possible.
Shield grounding process
•RS-485 cable wire shielded wire ......................... Connect to the FG terminal block.
• Central control wiring shielded wire .......................When using the system controller with one unit, open the shielded wire of the
central control wiring and perform insulation processing.
When using the system controller with multiple units, connect the shield of
the central control wiring to the closed end and open the shield at the final
end of the system controller to perform insulation processing.
Perform the central control wiring shield grounding on the air conditioner
side.
• Be sure to install a circuit breaker or all-pole isolating switch (with a contact breaking distance of at least 3 mm) on the
primary side of the power supply.
• Fasten the screws to the terminal block with torque of 0.5 N•m.
Central control wiring stripping length RS-485 cable wire stripping length Digital I/O cable stripping length
Attach a round crimp terminal to each wire of the power line and
signal line.
Loosen the screws with a screwdriver, insert the digital I/O cable,
and tighten the screws securely.
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