VESDA ECO Installation Instructions
RS485 Interface Connection
ECO gas detectors are equipped to provide serial communication to Xtralis configuration
and monitoring software or for interface to 3rd party higher level systems.
The serial interface (Modbus RTU) provides multi-drop serial communication capability to
a number of ECO gas detectors via a screened twisted pair cable. When used to interface
with Xtralis VSC or Xtralis VSM4 monitoring software, a maximum of 32 devices can be
attached to the bus.
For interfacing ECO to 3rd party higher level systems, please refer to the separate ECO
Modbus interface guide with regard to register mapping, data types and data limits.
The Modbus RTU interface on the ECO detector is implemented using the EIA-485
standard for the physical interface. This is a two-wire differential, half duplex connection
providing excellent noise immunity over cable lengths up to 1200 m and at high data
transmission rates. The ECO has been designed to meet the requirements of the “Modbus
over Serial Line, V1 2002” specification when using an RS485 interface.
By default, the Modbus protocol settings for an RS485 interface are:
•
Baudrate 19200
•
Parity Even
•
Stop Bits 1
These are the default settings programmed into the ECO at shipping. ECO detector is
provided with a 120Ω termination resistor fitted to the PCB assembly along with a jumper
connection next to SKT2, which permits the user to connect the 120Ω termination to the
bus. The jumper is fitted as supplied and should be removed from all units except for the
last one in the line.
Note:
Different methods of termination must not be mixed on the same bus.
Communication
USB:
The USB port is used for initial configuration and local maintenance or servicing
of the detector using a PC installed with Xtralis VSC software. Install Xtralis VSC prior
to connecting the detector to the computer to ensures that the required USB drivers are
present.
Power Up
Connect 24 VDC power to the PWR IN terminal.
On power up:
•
The Power LED illuminates and the detector runs a series of self-diagnostic tests.
•
If there is a fault, the Fault LED illuminates. To identify the fault, check the Active Event
List for the detector using Xtralis VSC.
Configuration
For initial configuration, use a USB connection and the Xtralis VSC software.
•
After installing ECO gas detector, make sure VESDA is working properly.
• Normalize the airflow. This takes approximately 6 minutes, after which the flow reading
should be close to 100.
•
Reset the detector. It should now be running without faults.
Commissioning
• Carry out a gas test to confirm that the gas levels match the site’s requirements and
test the relays. Refer to the VESDA ECO Product Guide for further information.
Wiring:
Power, Relays, RS485 Modbus, 4-20 mA analog outputs
Warning:
Always disconnect detector power before plugging/unplugging electrical, relay
or network connections. Failure to do so may cause data corruption and/or
component failure.
The electrical functions of the terminals are as follows:
SKT1
Pin 1
Relay 1, Contact A
SKT1
Pin 2
Relay 1, Contact B
SKT1
Pin 3
Relay 2, Contact A
SKT1
Pin 4
Relay 2, Contact B
SKT1
Pin 5
Relay 3, Contact A
SKT1
Pin 6
Relay 3, Contact B
SKT1
Pin 7
Relay 4, Contact A
SKT1
Pin 8
Relay 4, Contact B
Note:
The function of relays 1–4 can be programmed using the Xtralis VSC software.
Refer to VESDA ECO Product Guide for further details.
SKT2
Pin 1
RS485 Signal A ( Modbus D0 )
SKT2
Pin 2
RS485 Signal B ( Modbus D1 )
SKT2
Pin 3
Power Supply Input (Nom24V)
SKT2
Pin 4
Power Supply return
SKT2
Pin 5
Cable Screen Termination
SKT2
Pin 6
Digital Input Remote Alarm Reset
SKT2
Pin 7
4-20mA Current source output A
SKT2
Pin 8
4-20mA Current source output B
The specific details of the connection to each function is detailed in the VESDA ECO
Product Guide (document number 17878).
Power and Relay Wiring
Power:
Connect a 24 VDC power supply which is compliant with local fire protection codes
and standards to the PWR IN.
Relays:
The relays interface to the Fire Alarm Control Panel (FACP) to communicate
faults, and gas alarms states. Relay contacts are rated 1 A @ 30 VDC, resistive. Connect
as required by the system design. Use electrical wire sizes from 0.2 mm² to 1.5 mm²
(24 -16 AWG).
Warning:
Ensure that all wiring complies with manufacturer’s instructions and local and
national fire detection code requirements. Refer to Codes and Standards
Information for Air Sampling Smoke Detection section of the detector product
guide for further information on wiring compliance.
Caution:
DO NOT LOOP WIRE UNDER TERMINALS WHEN WIRING DETECTORS.
BREAK WIRE RUNS TO PROVIDE SYSTEM SUPERVISION OF CONNECTIVITY.
4-20mA Analogue output
Each ECO gas detector is provided with two analogue 4-20mA current source outputs (one
per gas sensor). Each analogue output is scaled to reflect the default gas detection range
of the gas sensor it is associated with.
The two current source outputs (A and B) on -ECO are designed to be wired to industry
standard 4-20mA current monitoring devices. Refer to the manufacturer’s instructions for
making connections to the current loop monitor.
