User Guide for RLE Technologies models including: BMS-LD3Z, Three Zones of Integrated Leak Detection, BMS-LD3Z Three Zones of Integrated Leak Detection

BMS-LD3Z Quick Start Guide -

DIP Switch 1 DIP Switch 2 24VDC Power Input Front Panel LED Push Button RS-485 Wiring Connection BMS-LD3Z Physical Diagram Zone 1 Leak Detection Leader Cable

Quick Start Guide

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BMS-LD3Z QuickStartGuide05-21
BMS-LD3Z Quick Start Guide
Thank you for purchasing a BMS-LD3Z three zone leak detection monitoring device designed to integrate directly into a building management system (BMS). This guide outlines basic BMS-LD3Z installation and configuration. Before you install a BMS-LD3Z, check RLE's website to ensure you are using the most recent version of our documentation. If you need further assistance, please contact RLE Technologies at
© Raymond & Lae Engineering, Inc. 2011. All rights reserved. RLE® is a registered trademark and SeahawkTM, FalconTM, and RaptorTM are trademarks of Raymond & Lae Engineering, Inc. The products sold by RLE Technologies, 104 Racquette Drive, Fort Collins, CO 80524 are subject to the limited warranty, limited liability, and other terms and conditions of sale set forth at
Installation Supplies
Included with the BMS-LD3Z BMS-LD3Z device Available from RLE, sold separately 24VDC power adapter Leak detection cable, LC-KITs, and spot detectors as necessary for your application Additional Supplies 18AWG shielded twisted pair stranded copper wire - no more than 2000ft (610m) (Modbus RTU or BACnet MS/TP communication via RS-485 port)
Mount the Device
The BMS-LD3Z is designed to be installed in a panel, on a DIN rail, or mounted on a wall. · If you're installing it on a DIN rail, use the DIN rail clip and secure the unit
appropriately for your application. · If you're mounting the unit on a wall, use a screwdriver to loosen the three
screws and remove the DIN rail clip from the back of the unit. Then use the keyhole slots and secure the unit to the wall.
Power the Unit
The BMS-LD3Z is designed to accept hardwired 24VDC power through the power terminal block (TB2). If hardwired power is not available, purchase and install RLE's PSWA-DC-24 power supply.

Leak Detection Sensing Cable

Since leak detection sensing cable cannot connect directly to a controller, a

leader cable is used to connect each separate zone of leak detection cable to the

BMS-LD3Z. For each zone of leak detection:

1. Insert the stripped wires of the leader cable into the

appropriate slots in the terminal block - from left to right:

white, black, green, red. Tighten the screws to secure the


2. Unscrew the EOL from the end of the leader cable.

3. Attach the length of sensing cable to the leader cable.

4. Route the sensing cable according to your cable layout

Leak Detection Leader


Cable Terminal Block

5. Secure the EOL to the unoccupied end of the sensing cable. Connection Wiring

6. Repeat steps 1-6 for each zone of leak detection.


Set the DIP Switches
The BMS-LD3Z has two sets of DIP switches. Push the numbered switch to the
right to turn it on; push the switch to the left to turn it off. DIP switch 1 is used for system and communications configuration. DIP switch 2 is used to set the unit's device address.

DIP Switch 1, switches 1 through 8

SW1 and SW2 - Set the baud rate for the EIA-485 Port - 8 bit, no parity, 1 stop bit.

1 = Off

2 = Off

9600 baud

1 = On

2 = Off

19200 baud

1 = Off

2 = On

38400 baud

1 = On

2 = On

76800 baud

SW3 - Modbus RTU or BACnet MS/TP Selection

3 = Off

Communication via BACnet MS/TP

3 = On

Communication via Modbus RTU

SW4 - Modifiable BACnet Instance (For advanced users only)

4 = Off

BACnet instance set via DIP switch SW2 (default)

4 = On

BACnet instance set from the command line. Refer to the BMS BACnet Instance Modification Technical Guide for complete instructions.

SW5 - Zone 1 Leak Detection - Enable or disable leak detection for Zone 1.

5 = Off

Leak detection is enabled. (Default)

5 = On

Leak detection is disabled.

SW6 - Zone 2 Leak Detection - Enable or disable leak detection for Zone 2.

6 = Off

Leak detection is enabled. (Default)

6 = On

Leak detection is disabled.

SW7 - Zone 3 Leak Detection - Enable or disable leak detection for Zone 3.

7 = Off

Leak detection is enabled. (Default)

7 = On

Leak detection is disabled.

SW8 - Leak Alarm Delay - The amount of time that elapses between the time a leak is detected and when that leak is annunciated.

8 = Off

10 seconds (Default)

8 = On

120 seconds

Use DIP switch 2 to set the address of the device. This should be a number between 1 and 254. Adjust the individual switches until their sum equals the device address. Switch values are as follows:
DIP Switch 2, switches 1 through 8
SW1 through SW8 - Set the device address for the BMS-LD3Z

Connect the BMS-LD3Z to the Network
The BMS-LD3Z needs network connectivity to communicate with a Modbus RTU or BACnet MS/TP system, such as a BMS. Use a 2-wire RS-485 cable to connect the BMS-LD3Z to the network through the wiring connection at TB1. RLE recommends an 18AWG shielded twisted pair stranded copper wire for the connection, using
no more than 2000 feet (609.6m) of wire at this specification. If longer runs are needed, please contact RLE.

CLI After the BMS-LD3Z is connected to the terminal (115200 bps, 8 bit, no parity 1 stop bit) you'll see a menu that can be used to help understand the BMS-LD3Z's settings and functionality. Commands available from this menu are:

Command Action


List all sensors


Show current system settings (set by dip switches)


Show BACnet device ID in use

sbid reboot

Configure custom BACnet device ID Reboot unit


Print main menu

Modbus Communications
The BMS-LD3Z uses its RS-485 port to communicate via Modbus. The BMS-LD3Z is
configured to act as a Modbus Server device on a common network and is a Server only device ­ it will never initiate a communications sequence.

Read Registers To read the BMS-LD3Z's parameter values, the Client must send a Read Registers request packet (function code 03 or function code 04).

Register 30001

Name Status

Bit Level Status - as follows: 0x01 (1) = Zone 1: Leak Detected 0x02 (2) = Zone 2: Leak Detected 0x04 (4) = Zone 3: Leak Detected 0x100 (256) = Zone 1: Fault Detected 0x200 (512) = Zone 2: Fault Detected 0x400 (1024) = Zone 3: Fault Detected

Units None

Range 0-65535

30002 30003 30004 30010 40009

Leak Current Zone 1 Leakage current on cable

Leak Current Zone 2 Leakage current on cable

Leak Current Zone 3 Leakage current on cable


Firmware version

Number of Zones (3)

Amps Amps Amps xx.xx X 100

0-65535 0-65535 0-65535 0-65535

BACnet Communications
BACnet auto-discovery can be used to find all BACnet data points available for the 1-wire sensors. BACnet MS/TP objects are as follows:






Zone X Enabled


Zone X Leak Detected


Zone X Leakage Current


Zone X Cable Break

Directions for modifying the BACnet instance, intended for advanced users, can be found in the BACnet Instance Modification Technical Guide.

System Reference
Front Panel LED
The lower right corner of the BMS-LD3Z houses an LED that uses different colors and blink patterns to convey device status and information.

Blink Pattern

Status Description

Green / Off - Every 2 seconds

Device operations are normal

Cyan / Off - Up to once every 10 seconds

The BMS-LD3Z is being polled by the Modbus RTU or BACnet MS/TP system

Leak Detection Zone Status LEDs The LEDs next to the three leak detection leader cable connectors across the top of the device light to indicate the leak zone's status:

Blink Pattern

Status Description

Solid Green

No leak or cable break detected

Solid Yellow

A cable break is detected in this zone

Solid Red

A leak is detected in this zone


Zone is disabled.

Front Panel Push Button A white button in the lower right corner of the BMS-LD3Z can be used to perform a factory reset of the device:



Press and hold for 20 seconds, then release the button (Red LED will turn ON after 10 seconds and then turn OFF after an additional 10 seconds)

Perform a full factory reset of the unit. Any stored BACnet settings will be deleted.

BMS-LD3Z Physical Diagram
Zone 3 Leak Detection Leader Cable

Zone 3 Status

Zone 2 Leak Detection Leader Cable

Zone 2 Status

Zone 1 Leak Detection Leader Cable

Zone 1 Status

RS-485 Wiring Connection

Push Button

Front Panel LED

DIP Switch 1 DIP Switch 2
24VDC Power Input



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