Wireless Addressable Software Based Control Command Center
A HARDWARE IBM/HP High End Rack Server  for 24 x7 application
2 Application For wireless FDA Plant Centralised Monitoring Station
3 Processor Intel® Xeon®  DUAL
4 Memory 8GB standard memory
5 Cache 2×6 MB
6 Hard Drive 250GBX2
7 Chipset Intel compatible Chipset
9 RAID controller RAID 1
10 Disk bays Hot Swap Up to 2 nos 3.5″ hot-swappable Serial Attached SAS
11 Network Interface integrated dual Gigabit Ethernet
12 Industry standard compliance Microsoft® Logo certifications Operating System : Windows Server 2011
13 Ports Front: 2 USB Rear: 4 USB, 2 Ethernet, 1 video, 1 serial
14 Power supply Redundant Hot Swappable with external additional power supply
15 Server power cords IEC power cord  with NEMA power cord
16 System fans 2 fan
17 Monitor ’32”x4 Video Wall.
18 UPS 5 KVA ,
19 Server Rack Standard
20 Printer Laser Jet, Make -HP
21 Operating System Microsoft Window 2003 OEM with 5 user
22 Ethernet Switch 8 port 10/100 MBPS
B Loop 255 Loop, each Loop = 255 Devices
C 255 Loop Wireless Addressable Long Range RF Transreceiver with MESH protocol Two Way Communication Specifications:

(3.0V, 25°C) Min Typ Max Unit
Operating Frequency 433.92 MHz
Frequency tolerance (12.5 kHz) +/-1,5 kHz
Frequency tolerance (50 kHz) +/-4.25 kHz
Number of 12.5 kHz channels 6
Number of 50 kHz channels 1
Number of 25 kHz channels 3
RF Data rate/modulation (12.5 kHz) 2.4/GFSK kbps
RF Data rate/modulation (12.5 kHz) 4.8/GMSK kbps
RF Data rate/modulation (50 kHz) 38.4/4GFSK kbps
RF Data rate/modulation (25 kHz) TBD kbps
UART baud rate 2400 230400 Baud
TX mode: Output Power (programmable) -27 dBm
2nd /3rd harmonic -54 dBm
Rx Mode: Sensitivity -105 -124 dBm
Blocking, +/- 1 MHz 30 74 dB
Blocking, +/- 2 MHz 35 79 dB
Blocking, +/- 10 MHz 60 81 dB
Adjacent Channel Rejection 52 dB
Alternate Channel Selectivity 57 dB
Power Supply: Supply Voltage (VCC) 2.5 3.8 V
Supply Voltage (VCC_PA) 2.5 5 V
Current Consumption, RX 22 mA
Current Consumption, TX, 27 dBm 280 -300 mA
Current Consumption, TX, 24 dBm 180- 200 mA
Current Consumption, TX, +14 dBm 43- 45mA
Current Consumption, Power Down 1 -2 μA
Temperature range: -40 +85 °C
TEST Certificate : ERTL-STQC

D Wireless Protocol MESH
IP Audio Decoder Applications:

  • Multi room IP Audio System Receiver
  • Internet Radio Receiver
  • Instore Audio Player
  • SIP and IP Paging Zone Device
  • Digital Announciator  Message Player, Message Repeater
  • Generic VoIP decoder for IP Paging and Announcement applications
  • Commercial Audio Streaming Applications

Features:

  • AACplus, MP3, Ogg Vorbis, G.711, PCM linear Decoding
  • IP Streaming via TCP, UDP, RTP, Multicast
  • Line Level Output (Stereo)
  • Relay Output (Ex110 & Ex120 only)
  • RS-232 Serial Port
  • Power Supply (9-30V, plug included)
  • IR receiver and Display built-in (Ex110 & Ex120 only)
  • MicroSD or USB Flash Interface

Technical Specifications:

Electrical

  • 9 to 30 VDC, 5 Watt max.
  • 2.1mm barrel connector

Ethernet

  • 10/100Mbps auto,
  • RJ-45 connector with integrated Link/Activity LED
  • Protocols: TCP/IP, UDP, RTP, SIP, DHCP,

Multicast capable

  • ES-100/spkr (Ethersound, output, no daisy-chain) support

Analog Output

  • Line level output, 40..60 Ohm output impedance on RCA and 1/8″ headphone jack. Output level software controllable
  • Full scale output voltage: 5.6 dBu, 4 Vpp
  • Frequency response (-3dB) 19Hz ..22kHz *
  • Dynamic range 87 dB
  • SNR/THD -87 dB, <0.05%

Audio formats

  • MP3 CBR/VBR, up to 320kbps, 8..48kHz sample freq.
  • AAC, AAC plus, AAC-HE (AAC plus V2)
  • WMA (up to version 9), Ogg Vorbis
  • PCM 16bit @8, 16, 22.05, 24, 32, 44.1, 48 kHz
  • G.711, uLaw, aLaw (sample rates same as PCM)

Discrete I/O

  • 1 NO relay contact, 24V 0.5A (110&120 models only)

RS-232 Interface

  • 300..230’400 Baud asynchronous, tunneling or local control

Display

  • Backlit LCD, 2×16 chars (110&120 models only)

IR Interface

  • IR via serial port, built-in IR receiver (110&120 models only)
  • IR remote control included with Exstreamer 110 & 120
Communication & announcer unit
  • Ethernet communications / sending control and audio packets, receiving status information
  • Digitalizing sound from the microphone
  • Switching on and off endpoints
  • Managing acknowledgements
  • Providing operator with information on operation status of devices in the system, on potential inaccessibility thereof
    • Physical design:  7-key desktop panel (PE)
    • Screen: 320×240 pixel, FSTN + LED background
    • Microphone: XLR electret-type flexible neck microphone
    • Power supply: 12 VDC / 500mA
    • Operating temperature range: between -10 C° and +50 C°
    • Communications interface:
      • 1 piece 10/100 Mbit/s standard Ethernet
      • 1 piece standard RS232 port
E Hooter 110dbx4
G Wireless Third Party Integration MVWS, Innergen, Ventilation, Air conditioning , HVWS, Suppression system etc
H Auto Dialer Tone based 20 nos Auto Dialer
I Transponder
  1. Dual band 900/1800 MHz
  2. Support Data, S.V.F.
  3. Max Power Output: 2W (900Mhz), 1W (1800Mhz)
  4. Group 3 FAX support (Class 1 and 2)
J Wireless Range  5km

 

A. Video Wall: 32”4×4

Poroposed LCD Video wall should be a matrix of  4×4 NSL  LCD or similar Display System having Four  Nominal WXGA+ Modules stacked in TWO  rows and TWO columns.

The Display controller to drive these NSL LCD Video wall should be  Modules is kept below the mechanical structure of the Display Wall and the connecting cables between the Display Controller & LCD Modules run internally. The proposed solution of LCD Video wall will behave as a Single Logical Display with the help of our Display Controller. Display Controller will be running on WINDOWS XP professional operating system and would be connected to the Operator Workstations in the Control Room thru the Ethernet (10/100/1000 Mbps).

One can always load / install various WIN based applications on the Display Controller and can run them from there to show the display of the same on the Large Screen Display.

Display Controller can also take various inputs e.g. DVI, RGB, s-video. There should be a provision for  2 nos of DVI input in the proposed solution  of streaming video inputs via quad streaming video input card.

One can also show the mirror images of the monitors of the WIN XP based OWS / PC connected with Display Controller over LAN. There should be provision of control room management software which will be seamlessly integrated with Wireless FDA  systems. It will enable to show detail content on the LCD display wall.

Using the Software, one can always pre configure various display layouts to be displayed any time with a simple mouse click. The applications defined in a particular layout are automatically opened, sized and positioned accordingly on the LCD Display as soon as that particular layout is launched. There should be a provision for a provision for 6 clients to be added which are available on the same network for displaying the video content on LCD video wall.  All clients should be  IP based and on the same network.

Using the Remote Pointer functionality of  software, the control of the keyboard and mouse of the Display Controller, can be taken over by any WINDOWS XP OWS’s keyboard and mouse if the same is connected with Display Controller over the LAN.

Features:

  • Narrow-bezel LCD NSL Or similar display with WXGA (1366×768) resolution.
  • Overall Gap between two LCD panels should be less than 7.3 to 10 mm .
  • Size of 4X4 matrix of LCD wall
  • Allows multiple sources in Native resolution without loss of pixel or scaling for control room applications.
  • Multiple sources (video, PC content or streaming video) can be presented and positioned anywhere across the entire LCD stack.
  • Accurate Color calibration for display consistency management to ensure correct white point and accurate grayscales.
  • Front access removal of any LCD without removal of other LCD’s.
  • A special cooling concept to avoid heat spill over between LCD’s
  • Low noise.
  • Can be serviced from the front and the back.
  • Require no back room space at all, so they are ideally suited for control rooms where space is limited.
  • No permanent burn in for use under 20 hours/day
  • Anti Image Retention

 

Technical Specifications: Size4x4 (1366 x 768) LCD displays of WXGA resolution ( The system should be further expandable to make larger displays of 8 X 8 LCD displays)

  • Brightness: 500 Cd/m2 or more
  • Dimming allows lower brightness: factor 3
  • Contrast: 3000:1
  • Overall Inter Screen Gap : Not more than 8 mm
  • Anti-glare front
  • White point: 10,000 K
  • Response time: 10 ms or less
  • 7 M colors
  • 20×7 operations
  • Viewing Angle: Better than 170 O Horizontal & Vertical.
  • AC Input Voltage : 100-240 V AC ; 50-60 Hz
  • Input Capabilities : VGA/DVI , Component , S-Video , Composite
  • Operating Temp. : 5 – 40 O C
  • Operating Humidity : 20 – 80 % RH non-condensing

B. Centralised Monitoring Station shall be intelligent, with its own memory with inbuilt in RF transreceiver module with MESH Protocol for communication with the all the Hooter Panel installed in MBPT and annex Building. The control panel as a built-in feature shall have 255 Loops Each loop shall be able to take at least 255 Local Monitoring Station& Hooter panel in the installed area.

The CMS shall have necessary loop modules, alarm o/p modules and control output for various control functions. The CMS  shall have facility to process the input signals and also have facility to control all the input data received from addressable type Local Monitoring station / Local Hooter  Panels from different areas in plant.

CMS shall have number of electronic filters to ignore false alarm and increase sensitivity to real fires from sensors. The electronic filters shall recognize the unwanted alarm from detectors due to electrical spikes.

The CMS  shall have separate suitable local 32×4” wall mounted Video Wall display preferably with touch screen and with enough area to indicate the address of each device and clear text about the location of alarm / trouble through Graphical layout of plant area /electrical layout on screen. The CMS panel shall be connected to a local graphics work station comprising of PC, Laser Printer, Keypad, Mouse, peripherals etc. Ethernet connectivity with plant LAN network

C. SOFTWARE:

1.0 The Display System shall be server Windows TM based application designed primarily for the monitoring of fire alarm systems installed in the Plant area . Providing the user with a means to view the entire system or campus enabling rapid recognition and identification of source and extent of each event, particularly during multiple alarm conditions. The presentation of alarm information shall be provided in a simple, standard text or graphical format, giving operators the right information on which to make appropriate decisions with MESH protocol in two way communication.

1.1 Software Control Panel Features:

a. Text and graphics versions
b. Prominent user controls with attractive appearance
c. Compatible with RF hardware addressable systems and network outstations.
d. Print graphical pages with automatic event logging.
e. Multi level password protection.
f. Unlimited number of graphical pages.
g. Language text translations
h. 255 Addressable Zones.
i. MESH protocol with two way communication

1.2   Networked system:

The Display System shall be designed specifically for connecting to the range of Local Monitoring Station/ Local Hooter Panel  providing full interrogation of sophisticated features. Powerful two way RF cards with MESH protocol located within control panel shall enable up to 255 addressable Zones to be supervised and each Local Monitoring Station/ Local Hooter Panel  enable up 255 nos to be supervised. This shall provide the operator with an instantaneous overview of all systems located with immediate access to detailed information as required. Alternatively, using network outstations incorporated within the system design, monitoring of third party equipment via discrete digital inputs shall be achieved.

1.3 Priority rating:

The Display System shall provide central control and monitoring for remote sector nodes using full-duplex transfer of information, status and commands over a networked system. The system shall allow each alarm device or input to be allocated a priority, which ensures that the operator is presented with the most urgent high priority alarms, followed by those of lesser importance. Monitoring of non-fire related events such as plant, security, and process are also to be catered for by the system.

1.4 Comprehensive Reporting:

A system event log shall be provided with the capability to provide comprehensive incident reports for future analysis. The export facility shall enable reports to be stored in pdf format

1.5 System Capacity:

a. 255 (nodes) addressable Wireless Local Monitoring Station/ Local Hooter Panel.
b. 255 (nodes) addressable long Range Transreceiver Mesh Protocol.
c. Different Alarm Output.
d. On event auto dial out facility – supporting two lines and up to 20 calls on Each line.
e. Ten priority queues.
f. Drop-down alarm display window on 04 different video wall .
g. GIS based Plant layout presentation with individual detailed plant location divided in to 4 screens
h. Active status reporting.
i. At a glance, site-wide system status monitoring.
j. Common messages – 600-character alarm intervention text per device.
k. Event – Logs.
l. System log.
m. Priority log.
n. Backup of logs.
o. Compile event report and register.
p. Action log.
q. Graphic location log
r. Alphanumeric Rolling Display
s.Automatic potential free Addressable trip relay with inbuilt receiver 5A NC Contact.

1.6 Print Functions:

a. Automatic for all priority events.
b. Restrict priority event facility.
Print graphic map pages

1.7 Installation, Testing, and Commissioning & Training: The total system shall be installed, tested and commissioned for effective functioning. Our staff shall be trained for smooth operations, trouble shooting and maintenance of the total system.

Certificate :ERTL -STQC

D. The CMS should offered shall have high degree of flexibility with the possibility of expanding to a bigger system with several control panels and control and information units. Programmable activation of control output relays for tripping ventilation system, AC system and closing of fire doors in the event of fire. Individually controlled, monitored alarm outputs for external hooters, lamps etc. Fire control panel shall have facility for test features.

The status check of each detector, interface units for alarm, prior warning, troubleshooting , disabling shall be possible from control panel.

The Power Supply to the control panel shall be 240 V, 50 Hz. Single phase, AC supply. All controllers, RF transmitters and power supplies should be duplicated for failsafe operation. The panel should have additional capacity to operate auxiliary equipment like fire dampers, ventilation and / or pressurizing fans, emergency light, smoke vents etc. if required.

E. Periodic Detector Test:

For detector testing from the panel which eliminates the need for testing the detectors in the field every now and then Trouble Remainder: To remind the operator of the maintenance required at the individual detectors. Upload /download to PC computer For programming the panel in the first power up Alarm Verification with Tally: To verify any alarm received by the fire alarm panel before the hooters are sounded.

Walk Test: The entire loop can be tested by a single person with the print out at the printer.

Smoke Detector maintenance Alert: Give an indication to the operator that the detector requires cleaning. The system shall provide all the controls and indicators used by the system operator and may also be used to program all system operational parameters.

F. Field programming:

The system shall be programmable, configurable and expandable in the field The field programmability is essentially required so as to make the necessary modifications in the system parameters as per the site conditions. The field programmability shall allow the client make changes in various system parameters as per their operation philosophy.

All programming shall be accomplished through PC / Laptop.

G. Point read with Handshaking mode:

The system shall be able to display the following points status diagnostic functions without the need of peripheral equipment. Each point shall be annunciated for the parameters listed.

A: Device status

B: Device type

C: Custom Device Label

D: Software Zone Label

E: Device Zone Assignments

F: Detector Sensitivity

G: All Program Parameters.

H: Handshaking Information from each Local Monitoring Station/ Local Hooter Panel installed in Plant area

I : Health condition monitoring in each 01 hrx24 hrs of Local Monitoring Station/ Local Hooter Panel/ detectors /MCP/LHS / third Party Integration devices installed in Plant area.

J:different Audio visual alarm with graphic presentation of Health condition monitoring of all the devices in Wireless FDA system install in Plant area in fixed intervals.

K : Low Bat , Mains Fail , Detector Tamper , Dust accumulation chk monitoring for all the devices installed in Plant area for Wireless FDA System using wireless two way communication MESH protocol.

M: Report generation for health condition monitoring with programmable sms facility to the concern responsible officials in the respective plant area .

N: Efficiency monitoring during actual alarm with RTC

O: MESH protocol monitoring with two way communication

H. System history Recording and reporting:

The CMS panel shall contain a history buffer that shall be capable of storing minimum 1000 system output/input/control activations. Each of these activations, shall be stored and time and date stamped with the actual time of the activation, until an operator requests that the contents be weather displayed or printed. The contents of the history buffer may be manually reviewed, one event at a time, and the actual number of activations may be displayed and or printed.

I. Automatic Maintenance Alert:

The fire alarm control panel shall automatically interrogate each addressable system detector and shall analyze the detector responses over a period of time.

J. Alarm – Hooters

The Hooter  shall be of rugged construction, have weather proof protection and suitable for outdoor mounting. It shall have adequate range to cover a radius up to 500mtr and shall be dual tone. The operator at the fire station / security control room shall have facility to energies the Hooter.

The Hooter shall be suitable for 12 VDC.

Strobe lights

The electronic strobe light being located at vital places shall have a high intensity flasher light for a visual alert from a distance.

Low battery alarm

Shall be displayed in Audio/Visual mode in the Fire Alarm Panel as per NFPA -72.

Wireless PA System

Salient features:

  • Micro-Controller based control panel – allowing the system to receive and process trigger/events.
  • Software based central monitoring system capable of monitoring multiple locations
  • Trigger events tracking and managements from single centrally located system.
  • The central monitoring system capable of monitoring multiple locations
  • Central monitoring system capable of transmitting the message for the occurred event immediately on the network, to the specified/concerned location
  • Multiple locations (trigger points) can be viewed & message can be transmitted simultaneously.
  • The events will be gathered in real time and communicated to central monitoring unit – to be seen and managed on a giant video wall.
  • Prominent user controls with attractive appearance
  • Compatible with RF hardware addressable systems and network outstations.
  • Print graphical pages with automatic event logging.
  • Multi level password protection.
  • Unlimited number of graphical pages.
  • Allows one to add, associate and manage audio receiving units of PA’S
  • Allows one to enter each audio receiving unit .
  • Allows one to associate an audio receiving unit with zone.
  • Configure pre-recorded messages for DIFFERENT EVENTS : Allows one to set up pre-recorded messages for each type of Event
  • Audio Driver Configuration: Allows one to setup/select device to sound input (recording).
  • Record messages and transmit/play in real time in selection locations/zones.
  • Scheduler: Allows one to setup a schedule to play pre-recorded messages at selected locations/zones.
  • Offline Units:  Offline unit list, so that the units can be checked and maintained.
  • Facility for live announcement through multiple IP paging stations with priority set.
  • Facility for pre-recorded announcement using master IP paging station,
  • Facility for background music using a music source
  • Remote health monitoring of power, audio-in, audio-out, overload etc.,

K.MESH Protocol

The CMS along with all  the Local Monitoring Stations/ Local Hooter Panels ,addressable detectors, other devices shall use MESH protocol.

Mesh conceptual description

Mesh is an all-embedded mesh/multi-hop network protocol which is fully embedded inside a family of RF modules with different RF frequency ranges. A network is defined to consist of a number of nodes where a node is one out of three types as described below. The wireless network of nodes can be connected to any type of sensors or actuators. The RF traffic is in a tree-type topology, where data transfer is up or down in the tree structure. The features fully contained in the embedded Mesh application firmware and which is dynamically and automatically handled after power up are:

  • Optimum network self forming
  • Self healing: The path with highest link quality and least number of hops to the recipient is chosen at any time. When optional paths are present, it is indicated with indicative blinks on a LED output. In a changing environment with changing link quality the network dynamically adapts to the optimum route

The features for wireless data transfer between any two nodes in the network are:

  • LBT (listen Before Talk)
  • Acknowledge
  • Retransmission(s) if required
  • AES128 encryption (optional)

Network Topology

The Mesh in its simplest topology consists of one Gateway and one Router. End nodes always must connect to a Router. There can be several Gateways within one network, they will then divide the work-load between them but there might be duplicate packages which must be handled at the end-server side.

Node description:

Gateway: Mandatory to form the network and as the name indicates, it takes the bidirectional application data to and from the wide area network or to a host processor which can be in the shape of a PC.

Router: Must be powered at all times as it takes the bidirectional data from any other device and in real-time either re-transmits and/or enter the application data on its UART.

End Device: Normally battery operated and normally in Sleep mode for increased battery lifetime. A host controller takes the End Device out of Sleep for transmitting data to the optimum Router location (automatically decided by Mesh).

Transparent mode and Packet mode

Default setting is transparent mode. In transparent mode, UART data entered into the Gateway will be received by all Routers in the network and will be made available at their UARTs without any changes. The addressing must then be in the application layer. In the other direction, with UART data from a Router to the Gateway, the data will only be received by the Gateway without any changes. In Packet mode, addressed data is possible as well as individual I/O control and monitoring of each Router. The link will then not be transparent but will contain extra bytes for command and control. The Gateway can then ask for I/O read-back as well, and receive packet-path information.

Getting Started

Form a network by configuring at least one of the modules as Gateway. Then secure that all Routers and End Devices have different Unique IDs but same System ID. This is mandatory for successful network self forming.

How to form the network

Power up the nodes in any random sequence. The LEDs start to blink in a predefined pattern.. Each node invites neighboring nodes to become members of the network and contains a short-list of possible routing paths. When one or more Gateway(s) come into vicinity, and only then, the complete network forms. No extra external processing effort in the terms of a network organizer controller (PC or large microprocessor) is required, each node actively and autonomous participate in the forming of the RF network.

How to transmit data

This refers to the most easy-to-use mode, the default mode named “transparent” for transparent bidirectional data transfer.
The module will transmit the data when

  • the max packet length is reached
  • the modem timeout limit is reached

The timeout limit is configurable in-circuit.

How to  receive data

Any received data packet with correct address and check sum will be sent on the TXD of any Router(s) pin using the same UART format as for transmit.

 Antenna

A simple quarter wavelength wire or a PCB track antenna which should transmit & cover the proper range with length corresponding to the quarter of a wavelength.

Mesh™ Embedded Protocol

The module offers a buffered, embedded mesh protocol. All data to be sent is stored in the module before transmitted by the RF circuitry. Likewise, when data is received, data is stored in the module before sent to the host. This allows the communication controller to add address information and to do error check of the data.

Transparent mode operation

Serial data entered on the Gateway serial port will be delivered transparently to all connected Router devices and transmitted on their respective serial ports. Serial data entered on a Router or End device serial port will be delivered transparently to the Gateway and transmitted on the serial port. Regardless of device type (Gateway, Router or End device), the serial port UART is ready to receive data when CTS is true. RF transmission will automatically be triggered on buffer full or character time-out on the serial port. The connected host must always verify CTS is true before sending any character, or characters may be lost.

RSSI-indication:

A LED connected to this pin will flash with one of the following frequencies/intervals based on RSSI level to the best Router or Gateway which Mesh select:

  1. 4 seconds (2 seconds “on”, 2 seconds “off”): No connections (“I am alive” indication only)
  2. 2 seconds: RSSI within sensitivity level + 10 dB
  3. 0.5 seconds: RSSI > Signal level above criteria 2 above

Network connection/Redundancy indicator:

A LED connected to this pin will flash with one of the following intervals based on network connections:

  1. No light: No connections
  2. 2s intervals (1 second “on”, 1 second “off”): 1 alternative route on same level in tree structure
  3. 1s interval (0.5s “on” and 0.5 sec “off”): 2 or more alternative routes on level above in tree structure

In general, the higher the frequency on the indicators, the lower the packet loss rate will be and the more robust the network will be against changing conditions in each hop. Both outputs from the module can as well be monitored by an external processor for other visualization of RSSI level and network connection quality.

RF Frequency, Output Power Levels and Data Rates

The following table shows the available RF channels and their corresponding frequencies,nominal output power levels and available data rates.

RF Channel Output Power Data Rate
1: 433.100 MHz
2: 433.200 MHz
3: 433.300 MHz
4: 433.400 MHz
5: 433.500 MHz
6: 433.600 MHz
7: 433.700 MHz
8: 433.800 MHz
9: 433.900 MHz
10: 434.000 MHz
11: 434.100 MHz
12: 434.200 MHz
13: 434.300 MHz
14: 434.400 MHz
15: 434.500 MHz
16: 434.600 MHz
17: 434.700 MHz
1: -20 dBm
2: -10 dBm
3: 0 dBm
4: 5 dBm
5: 10 dBm
1: 1.2 kbit/s
2: 4.8 kbit/s
3: 19.0 kbit/s
4: 32.768 kbit/s
5: 76.8 kbit/s
6: 100 kbit/s
7: For future use

RSSI Reading

The RF module provides a digital Received Signal Strength Indicator (RSSI) through the ‘S’ command when in Configuration mode, and included in received messages when the Gateway module is operating in Packet Mode. The module returns an 8 bit character (one byte) indicating the current input signal strength (followed immediately by a second character which is the prompt (‘>’) when in command mode). The signal strength is used by the Mesh protocol to indicate fading margin, and as a carrier sense signal to avoid collisions. The signal strength measure by the S command is the instantaneous value. The RSSI value included in a received package, is the signal strength at the originating module, when receiving data from the module that has been selected as the first receiver of packets form the originating module i.e. the first jump in the mesh network.

The RSSI value increases with increased input signal strength in 0.5 dB steps. Input signal strength is given by (typ.):

P = – RSSI / 2 [dBm]

The dynamic range of the RSSI (P) goes from the Sensitivity level up to typical -30 dBm (RSSI saturation level).

Temperature Reading

The module provides readings of a digital temperature monitoring sensor (TEMP) through the ‘U’ command. The module returns an 8 bit character (one byte) indicating the current temperature in degrees Celsius (°C) followed immediately by a second character which is the prompt (‘>’). The TEMP value increases with increased temperature in 1 °C steps and accuracy of +/- 2 °C.

Temperature is given by:

T = TEMP(dec) – 128 [°C] (example: TEMP=0x98 equals +24 °C)

Power Supply voltage Reading

The module provides readings of an internal power supply voltage monitoring sensor (VCC) through the ‘V’ command. The module returns an 8 bit character (one byte) indicating the current power supply voltage level followed immediately by a second character which is the prompt (‘>’). The command can be useful for battery power monitoring. The VCC value increases with increased power supply voltage in 30 mV steps. The power supply

voltage is given by:

V = VCC(dec)*0.030 [V] (example: VCC=0x68 equals 3.12 V)

Module Configuration

The configuration of the module may be changed in-circuit from the host during operation, at the time of installation of the equipment, at the manufacturing test, or even as a standalone module. The configuration is changed by sending commands on the UART interface after the module is set in configuration mode. Configuration mode is entered by asserting the CONFIG pin (set low).

In configuration mode, the module will respond to commands by sending a ‘>’ prompt on the TXD pin. This indicates that the module is ready to receive new commands. The CONFIG pin may then be de-asserted. Note that the CONFIG pin must be de-asserted before the Exit command (‘X’) is sent to the module in order to return to normal operation.

After a command has been executed, the module responds with the ‘>’ prompt character, indicating it is ready for a new command. New commands must not be entered before the ‘>’ prompt has been received. The time required to execute a command may vary depending on the command (see the Timing Information section). There is no ‘>’ prompt after the ‘X’ exit command.