EasyGrid User Guide MAN-00084 R 11.0
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FISO recommends shielded, twisted pair wiring, 24 AWG with 120Ω line impedance to connect the RS-
485 interface to the network.
FISO also recommends biasing the RS-485 BUS using pull-down and pull-up 1 KΩ resistors. Biasing the
RS-485 BUS line will prevent unknown voltage on these lines (RS-485 BUS floating). Leaving the RS-485
BUS floating may result in NORTECH conditioner communication failure.
You must identify the host device on the RS-485 network and then proceed with its 485 BUS line biasing,
as shown above.
Two termination resistors must be installed and have the same characteristic impedance value as the
twisted wire used on the 485 network. RS485 network termination resistors typical values are
respectively 120Ω and ½ Watt.
In Nortech mode, it is possible to connect up to 32 units together. When all units are connected on the
same RS-485 bus, this allows a user to execute the software configuration from a single USB port.
In MODBUS mode, it is possible to connect up to 247 units.
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