Distech Controls RS485 UUKL User manual

Installation Guide
Dual RS485 UUKL Option Module
Figure 1: Dual RS485 UUKL Option module
Product Description
The RS485 UUKL is a dual port, electrically isolated adapter, with two 3-
position, removable screw-terminal connector plugs. Each port has an
RS485 bias switch to set or remove biasing. LEDs verify power and
termination from the EC-BOS-8 UUKL and indicate RS485 trunk
message traffic.
The Dual RS485 UUKL Option Module is to be used with the
EC-BOS-8 UUKL in the Distech Controls' UUKL smoke
control system.
For detailed requirements, specifications, and procedures for
installing and operating UL 864 Listed equipment, you must
refer to the Distech Controls UUKL Smoke Control System
Design Guide (UUKL Design Guide_UG_10_EN).
Failure to meet the requirements or follow the procedures in
the Distech Controls UUKL Smoke Control System Design
Guide can void the UL 864 Listing for smoke control
equipment.
Module Combinations
The EC-BOS-8 UUKL supports a maximum total of two Dual RS485
UUKL modules.
COM Port Assignments
The EC-BOS-8 UUKL has two onboard RS485 ports that always operate
as COM1 and COM2. Installed serial option modules continue COM port
numbering based on proximity to the EC-BOS-8 UUKL, where the option
module closest to the EC-BOS-8 UUKL base operates as the next
available serial COM port(s). For example, if attached directly to the EC-
BOS-8 UUKL, this dual RS-485 option module operates as COM3 (upper
port) and COM4 (lower port).
For related details, see “COM Port Usage,” page 3.
Related topics such as the mounting and wiring of the EC-BOS-8 UUKL
or other option modules, installation of EC-Net™4 software, and usage
of the various RS-485-based drivers are in other documents. See
“Related Documentation,” page 4.
Included in this Package
Included in this package you should find the following items:
•One Dual RS485 UUKL option module, with two 3-position terminal
plugs for wiring to an RS485 trunk, and a grounding wire with quick-
disconnect connector.
•This Dual RS485 UUKL Option Module Install Sheet
Materials and Tools Required
Suitable tools and fasteners for mounting the unit, attaching it to an
already mounted EC-BOS-8 UUKL. DIN-rail mounting of the EC-BOS-8
UUKL and all its option modules is recommended.
A small flat-blade screwdriver is required to make wiring connections to
RS485 trunks.

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Figure 2: Dual RS485 UUKL Option module
This document covers the mounting and wiring of a Dual RS485 UUKL
option module for an EC-BOS-8 UUKL.
1
RS485-A port COMn(next available). For example, COM3
2
RS485-B port COMn+1 (next + 1). For example, COM4
Precautions
General Precautions
The following are warnings relating to the installation of the EC-BOS-8
UUKL option module.
•Remove all power to the EC-BOS-8 UUKL before
attaching (plug in) or detaching (unplug) any option
module, to prevent possible equipment damage.
•Removal of the EC-BOS-8 UUKL’s cover is not
required. No configurable or user-serviceable items
(such as jumpers or a battery) are inside the option
module.
Static Discharge Precautions
Static charges produce voltages high enough to damage electronic
components. The microprocessors and associated circuitry within the
devices are sensitive to static discharge.
•Work in a static-free area.
•Discharge any static electricity you may have
accumulated. Discharge static electricity by touching a
known, securely grounded object.
Mounting
Mounting the EC-BOS-8 UUKL and all option modules on a 35mm wide
DIN rail is recommended. Mounting on a DIN rail ensures accurate
alignment of connectors between all modules. Tabs on the EC-BOS-8
UUKL or module can be used for panel mounting as an alternate to DIN
rail mounting.
•Remove all power to the EC-BOS-8 UUKL before
installing or removing option modules. See
“Precautions,” page 2.
Mounting on DIN Rail
Prerequisite: The EC-BOS-8 UUKL is securely mounted on a 35mm DIN
rail, with adequate room left to mount the module.
1. Pull the option module’s locking clip down.
2. Tilt the module to hook over the DIN rail.
3. Push down and in on the unit, fastening to the rail.
4. Slide the module firmly into the EC-BOS-8 UUKL’s connector (or
existing option module) to seat.
Repeat for other modules as needed (4 maximum).
5. Push up the locking clip on all modules.
6. Carefully secure both ends of the final assembly with DIN rail end-
clips provided by the DIN rail vendor.
To remove a unit from the DIN rail, pull down its locking clip.
Slide the unit away from other devices, then swing the
bottom out and lift away from the rail.

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COM Port Usage
The Dual RS485 UUKL option adds two COM ports on the installed EC-
BOS-8 UUKL. The EC-BOS-8 UUKL has two onboard RS485 ports. In an
EC-Net 4 station running on the EC-BOS-8 UUKL, these two ports
always operate as COM1 and COM2.
Installed serial RS485 option modules continue COM port numbering
based on proximity to the EC-BOS-8 UUKL, where the option module
closest to the EC-BOS-8 UUKL base operates as the next available serial
COM port(s).
For example, if attached directly to the EC-BOS-8 UUKL, this dual RS485
option module operates as COM3 and COM4. If another dual RS485
option module is attached to it, the second module operates as COM5
and COM6.
Figure 3 shows a possible combination with port assignments.
Figure 3: COM port numbering examples
Wiring: Earth Ground Wiring
Earth grounding provides protection from electrostatic discharge or other
forms of EMI.
Figure 4: Earth ground to option module (and EC-BOS-8 UUKL)
Prerequisite: Nearby earth grounding point.
1. Install the included earth ground wire to the option module’s earth
ground spade lug, and terminate the other end to a nearby earth
ground.
2. The earth ground spade lug of the EC-BOS-8 UUKL should also be
terminated to earth ground. This also applies to any other option
module with a ground spade lug.
RS485 Wiring
Each of the two RS485 ports is capable of up to 115,200 baud, and uses
a 3-position, removable, screw terminal connector.
Use shielded, twisted-pair, 18-22 AWG cabling to wire in a continuous
multidrop fashion to other RS485 UUKL devices: “minus to minus”, “plus
to plus”, and “shield to shield”.
Connect the shield wire to earth ground at one end only, for example at
the option module. Figure 5 shows an example of RS485 wiring.
Figure 5: RS485 wiring example
1
RS485-A port COMnwith a network of RS485 devices.
2
RS485-A port COMn+1 with a network of RS485 devices.
3
RS485 devices on the same network should use the same
protocol and baud rate. Up to 32 or more devices may be
supported, depending on device specifications.

©, Distech Controls Inc., 2010 to 2019. All rights reserved.
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
without notice.
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, LONMARK and LONWORKS are registered trademarks of Echelon Corporation registered in the
United States and other countries.
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RS485 UUKL_IG_10_EN
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”.
LEDs
Five LEDs are on the front of the Dual RS485 UUKL option module.
Figure 7: LEDs on Dual RS485 option.
1
COMn(e.g. COM3), TX (Transmit) and RX (Receive).
2
COMn+1 (e.g. COM4), TX (Transmit) and RX (Receive).
3
PWR —Green, remains lit while EC-BOS-8 UUKL is
powered.
LED pairs TX and RX operate as follows:
•TX (yellow) —Transmit, flashes when the EC-BOS-8 UUKL is
sending data to a device connected on the RS485 trunk.
•RX (green) —Receive, flashes when the EC-BOS-8 UUKL is
receiving data from a device on the RS485 trunk.
These LEDs are also visible when the front access door is opened.
Related Documentation
For more information on installing, configuring, and using the EC-BOS-8
UUKL with Dual RS485 option module, refer to the following documents:
•EC-BOS-8 UUKL Installation Guide
•EC-Net 4 Drivers Guide