Toshiba BMS-IFMB1280U-E Installation Manual page 7

Modbus interface
Termination resistance setting
• TU2C-LINK / TCC-LINK termination resistance setting ............<For TCC-LINK>
Refer to the manual of each model for the termination resistance setting method.
Termination resistance
Shield grounding process
• Central control wiring shielded wire ...........................................When using the central remote controller with one unit,
REQUIREMENT REQUIREMENT
• 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.
U3 U4 U3 U4
LINK (Uh) LINK (Uh)
Termination resistance
ON
Leave just 1 line of the termination resistance in the
interface board of the outdoor unit (centre unit) ON, and
turn all the others OFF. (Refer to the wiring diagram
attached to the outdoor unit for the position of SW.)
<For TU2C-LINK>
For the central control wiring (Uh line), set the termination
resistance that is farthest away on the wiring between this
central controller and the other unit (VRF light commercial,
air to air heat exchanger, general purpose control
interface, air to water heat pump) to ON.
U3 U4
LINK (Uh)
Termination resistance
OFF
open the shielded wire of the central control wiring and
perform insulation processing.
When using the central remote 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
central remote controller to perform insulation processing.
Perform the central control wiring shield grounding on the
air conditioner side.
Installation Manual
U3 U4
LINK (Uh)
ON
6-EN