Distech Controls RS485 UUKL Manuale di installazione - Pagina 4

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Distech Controls RS485 UUKL Manuale di installazione

RS485 Bias Switches

Each RS485 port has an adjacent 3-position biasing switch.

Figure 6: RS485 UUKL module bias switches

Settings of each RS485 bias switch are as follows:

•

BIA - (Default, middle) RS485 biasing and termination: 2.7K bias

resistors with no termination resistor

•

END - RS485 biasing and a termination: 562 Ohm bias resistors and

150 Ohm termination resistor

•

MID - RS485 biasing or termination: 47.5K bias resistors with no

termination resistor

Often, adding RS-485 biasing can improve communications by

eliminating indeterminate idle states.

Typical scenarios for the best RS485 bias switch position are as follows:

•

BIA - (Default, middle) Often best if the RS485 trunk needs biasing,

but when the EC-BOS-8 UUKL is not installed at the end of the trunk.

•

END - Often best if the EC-BOS-8 UUKL is installed at the end of an

RS485 trunk of devices that is not already biased.

•

MID - Often best if the EC-BOS-8 UUKL is put in the middle of an

already-biased RS485 trunk.

If desired, you can change the position of an RS485 port's bias switch

while the EC-BOS-8 UUKL is running.

Each RS485 port also has two LEDs. See "LEDs".

Images are simulated. While all efforts have been made to verify the accuracy of information in this manual, Distech Controls is not responsible for damages or claims arising

from the use of this manual. Persons using this manual are assumed to be trained HVAC specialist / installers and are responsible for using the correct wiring procedures and

maintaining safe working conditions with fail-safe environments. Distech Controls reserves the right to change, delete or add to the information in this manual at any time

Distech Controls, the Distech Controls logo, Open-to-Wireless, EC-Net, Innovative Solutions for Greener Buildings, ECO-Vue, and Allure are trademarks of Distech Controls

Inc. BACnet is a registered trademark of ASHRAE. Echelon, LON, LonTalk, L

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LEDs

Five LEDs are on the front of the Dual RS485 UUKL option module.

LED pairs TX and RX operate as follows:

•

These LEDs are also visible when the front access door is opened.