The New Monitor and Control Module for GMRT Antennas
Contents
1. Nf National Centre for Radio Astrophysics Tata Institute of Fundamental Research Pune University Campus Pune INDIA NCRA e TIFR DO Technical Report On The New Monitor and Control Module for GMRT Antennas By Charu Kanade Naresh Sisodiya GMRT TIFR Khodad Email cpk naresh gmrt ncra tifr res in Under The Guidance Of R Balasubramaniam Group Coordinator Operations Group GMRT TIFR Khodad GMRT TIFR 30 11 2012 Acknowledgement We would like to avail this opportunity to express our heart felt gratitude towards our reporting officer Shri R Balasubramaniam Group coordinator Operations group GMRT for his constant guidance and encouragement Being a key person in bringing up Operations group activities he had a very clear idea of the objectives to be attained and guided us with his rich practical experience He has not only guided us through the project but also bring best out of us while designing New MCM Card He has always welcome new ideas new approaches to design efficient hardware and software He has encouraged us to develop software from the scratch rather than using any proprietary operating System for controlling new MCM Card The motive was to have entire control in our hand and making New MCM software very secure while putting it into network We are also thankful to Ms Nimisha Kanthariya and Mr S Nayak for their support and guidence Moreover we are thankful to Shri Raj Uprade for his2. New MCM hardware has been built around powerful rabbit core module RCM 4300 which has Rabbit 4000 processor on board New MCM has been designed using Altium Designer 6 7 software The PCB is double layered which includes four 16X1 multiplexing Signal conditioning to convert 5V to 0 5V RS 485 Serial Communication 2 SPI ports and 32 bits Data latching Most of the components are SMD to make New MCM very compact sae Ethernet Link 10 100 Mbps Serial Link Up to 115 2Kbps SPI Link Up to 200Kbps Above figure shows block diagram of Hardware architecture of the New MCM Block diagram has been described below RCM 4300 Core Module The RCM4300 series of RabbitCore modules is one of the next generation of core modules that take advantage of new Rabbit 4000 features such as hardware DMA clock speeds of up to 60 MHz I O lines shared with up to six serial ports and four levels of alternate pin functions that include variable phase PWM auxiliary I O quadrature decoder and input capture Coupled with more than 500 new opcode instructions that help to reduce code size and improve processing speed this equates to a core module that is fast efficient and the ideal solution for a wide range of embedded applications The RCM4300 also features an integrated 10 100Base T Ethernet port an optional A D converter and removable hot swappable memory cards The RCM4300 s mass storage capabilities make them suited
3. 26 Channel swap monitor 1 X 2 0 to 3 4 Volts 27 Monitor VCC CH 1 28 Monitor VCC CH 1 29 Monitor Vref 1 7 Volts CH 1 30 RF Power monitor CH 1 31 40 Band selector bit monitor 2 x 5 0 to 3 4 Volts CH 2 41 48 Solar Attenuator bit monitor 2 x 4 0 to 3 4 Volts CH 2 49 50 Channel swap monitor 1 X 2 0 to 3 4 Volts 51 Monitor VCC CH 2 52 Monitor VCC CH 2 53 Monitor Vref 1 7 Volts CH 2 54 RF Power Monitor CH 2 55 Common box temperature monitor Front End Controlling Control for Front End Boxes 130 260 MHz 250 500 MHz and 550 900 MHz 8 bits are designated as D7 to DO D7 D6 D5 D0 Parameters D7 D6 DS D4 D3 D2 D1 DO Extra High Cal Noise 0 1 1 0 Hi Cal Noise o 1 o 1 Medium Cal Noise 1 o 1 o Lo Cal Noise 1 0 o 1 RF ON RF Off 1 Filter 1 Select o o o Filter 2 Select 0 o 1 Filter 3 Select 0 1 0 Filter 4 Select 0 1 1 Filter by pass mode 1 x x Control for L band Front End Noise Cal is the same as other front ends Parameters D7 Filter select for 1060 band 1 Filter select for 1170 band 1 Filter select for 1280 band 1 Filter select for 1390 band 0 Filter select for bypass mode Control for Common Box Parameters D9 D8 50 MHz Band Selection 150 MHz Band Selection 233 MHz Band Selection 327 MHz Band Selection 610 MHz Band Selection L Band Selection O dB solar attenuator 14 dB solar attenuator 30 dB solar attenuator 44 dB solar attenuato
4. advice on New MCM Software development We also express our gratitude towards Shri C Sathees and Shri Mahadeo Misal for their invaluable help in building prototype boards and testing of New MCM card We would like to say sincere thanks to RFI group for measuring radiation from the prototype MCM card and the final version of MCM card We are also thankful to GMRT Front End group IF LO group for their support while testing New MCM with their system While working on New MCM card development project scientific technical and non technical staff has helped us in many ways We take this opportunity to convey our thanks to them Index Introduction New MCM Hardware Architecture New MCM software architecture Advantages of New MCM over old MCM List of inputs received from other groups for configuring the New MCM New MCM testing software MTest Reference Introduction New Monitoring and Controlling Module New MCM is the general purpose card designed using RCM4300 core module as processing unit It has a motherboard on which hardware for Multiplexing Signal conditioning Digital data latching and serial communication is placed On top of the motherboard RCM4300 as daughter board is placed New MCM will be directly interfaced with other systems of GMRT like Front End Fiber Optics Analog Back End Sentinel etc New MCM will monitor as well as control the various parameters of such systems It will also gener
5. using dynamic C which supports co operative multitasking It uses the infinite while loop approach instead of using the OS Moreover the New MCM software has been designed carefully so it can include all necessary features and exhibit good performance Serial Link Up to 115 2Kbps Ethernet Link 10 LOOMbps Software architecture of New MCM supports the Communication over the Ethernet as well as Serial link 64 channel monitoring 32 bit controlling up to 1Gb data storage using FAT 16 file system Furthermore it will have Real Time Clock and Web server running inside e Main Application or Master loop takes care of entire new MCM software it handles all the parallel tasks to be done by New MCM like to establish connection with remote device listen for command over either Ethernet or serial link to do background monitoring to serve web pages etc e Client Server running inside new MCM establishes socket connection with Server Client running on remote PC on particular port address e System specific input output modules looks at received command It looks for the System name like IE LO FE Sentinel etc Operation to be performed like Set Monitor Raw data Summery Parameters to be set like Attenuation Bandwidth LO frequency Filter selection etc Arguments to the parameters e Monitoring system parameters actually performs the monitoring task by running the ADC operations First raw data is generate
6. NITORING CHANNELS 01 973 02 974 03 976 04 975 05 973 06 972 07 974 08 972 09 972 10 975 11 976 12 970 13 972 14 975 15 972 16 970 0 14 0 13 0 12 0 13 0 14 0 14 0 13 0 14 0 14 0 13 0 12 0 15 0 14 0 13 0 14 0 15 17 969 18 976 19 971 20 970 21 970 22 974 23 976 24 971 25 974 26 968 27 976 28 969 29 976 30 971 31 978 32 978 0 16 0 12 0 14 0 15 0 15 0 13 0 12 0 14 0 13 0 16 0 12 0 16 0 12 0 14 0 11 0 11 33 974 34 976 35 975 36 973 37 973 38 976 39 976 40 976 41 973 42 977 43 972 44 973 45 976 46 971 47 972 48 976 0 13 0 12 0 13 0 14 0 14 0 12 0 12 0 12 0 14 0 12 0 14 0 14 0 12 0 14 0 14 0 12 49 972 50 974 51 968 52 972 53 974 54 975 55 972 56 972 57 977 58 976 59 973 60 976 61 973 62 976 63 979 64 970 0 14 0 13 0 16 0 14 0 13 0 13 0 14 0 14 0 12 0 12 0 14 0 12 0 14 0 12 0 11 0 12 SYSTEM STATUS ANALOG BACK END STATUS Spectrum Spreader Normal 0 50MHz Normal gt 50MHz2 Attenuation Frequency Doubler On Filter Frequency Divider 1 MCM Frequency Source RTC LO Frequency 600 MHz 600 MHz SET New MCM Following is the snapshot of control window New MCM Test SET 32 Digital Output SS SET LO Frequency Choose LO1 Choose LO2 Submit RFI Test Spectrum Spreader Choose SS Frequency Doubler Frequency Divider Submit Reference Documents e Rabbit 4000 Microprocessor User s Manual e RCM 4300 User s Manual e Dynamic C User s Manual e Dynamic C Function Reference Manual e Dynamic C TCP IP
7. User s Manual Volume 1 e RabbitWeb Dynamic C TCP IP User s Manual Volume 2 e Dynamic C FAT File System e GMRT MONITOR AND CONTROL MODULE SOFTWARE Mukund Gadgil 1992 Books e Programming in ANSI C E Balagurusamy Embedded Ethernet and Internet Complete Jan Axelson e Unix Network Programming Richard Stevens Web Sites e www digi com products wireless wired embedded solutions e www ti com lit an sboa092a sboa092a pdf e http beej us quide bgnet output html multipage index html e www w3schools com
8. ate the alarm in the erroneous condition and it will take immediate precautionary action As compared to existing MCM this New MCM is more powerful in terms of computing power operating frequency memory and the other features Moreover it is more intelligent in terms of its software capabilities and command structure As New MCM is more powerful than previous one most of the higher level intelligence has been shifted from Online and ABCCOM software to New MCM card In this document we have explained Hardware and Software architecture of New MCM Also comparison between New MCM and existing MCM is made to show how New MCM supersedes the existing one Motivation for changing the old MCM It has been 15 years since last MCM was designed during that technology has been advanced dramatically Now a days we have more powerful processors in terms of bits as well as operating frequency To keep pace with new technology and next generation Online system we need more powerful hardware at every stage Also we wanted to provide more functionalities in terms of processing power communication channels monitoring channels controlling channels intelligent command structure data storage etc In short we wanted to make it more and more powerful to support requirement of Online as well as other GMRT subsystems with which New MCM will be interfaced Criteria for designing New MCM Card The design criteria for New MCM is as follows e Softwa
9. coder PWM outputs and pulse capture and measurement capabilities It also features a battery backed real time clock glue less memory and I O interfacing and ultra low power modes Four levels of interrupt priority allow fast response to real time events Its compact instruction set and high clock speeds give the Rabbit 4000 exceptionally fast math logic and I O performance Analog Multiplexer The 64 input monitoring signals are handled by FOUR 16 to 1 Analog multiplexers Outputs of the FOUR multiplexer are connected to four input pins of 8 channel ADC Level Shifter Circuit The input voltage range of ADC used on RCM 4300 is from 0 V to 2V The Level shifter circuit maps input signal voltage range of 5 V to 0 to 2 V 32 bit Output Port The 32 output lines of Output Port are TTL compatible for interacting with GMRT subsystems All output lines are latched before appearing on output Connector Ethernet Interface New MCM has got an integrated 10 100 Based T Ethernet Port Serial Interface To support existing GMRT subsystems the Serial Interface at baud rate of 9600 bps It supports RS485 in Half Duplex multi drop mode differential transmission line SPI Bus The New MCM card supports SPI Bus to interface with FSW based new LO system The SPI Bus speed is 200 Kbps Two SPI ports are provided on the MCM card New MCM Software Architecture New MCM software has been developed from the scratch
10. d by scanning all 64 monitoring channels Summery is prepared based on gathered raw data Raw count 0 is generated for 5V 1000 for OV and 2000 for 5V e Set system parameters generates 32 bit patterns for setting the system specific parameters Unlike old MCM New MCM has inbuilt logic that reads the intelligent command and internally generates 32 bit pattern rather then receiving it from higher level application e Data storage modules stores monitoring data as well as keeps the log of command received and executed by MCM FAT 16 file system is used to manage stored data in directories and files e New MCM supports HTTP protocol so we can run web server on it This can be useful to host web pages for monitoring and controlling of GMRT subsystems We can put web pages that show current status of New MCM like RTC time 64 channel raw data local system summery etc Moreover we can use such web pages for system debugging The web pages provides very good user interface to set system parameters For security reasons setting of parameter will support lab testing only We have used HTML CSS JavaScript XML and AJAX for web development e RTC module reads as well as sets real time clock of New MCM RTC is used for synchronizing MCM with higher level application e TCP IP stack is provided by Dynamic C New MCM software calls library function of the TCP IP stack for establishing socket communication between the New MCM and the higher level appl
11. ication at 10 100 Mbps Ethernet link e Serial communication Module is used to do communication over serial link at 9600bps It supports communication of New MCM with existing system over RS 485 serial communication link Moreover Command structure for communication between MCM and higher level application is designed intelligently so that it can carry all the necessary information in one go and with minimum command length Command are pure ASCII characters bound in command structure Advantages of New MCM over existing MCM New MCM Existing MCM Processor Rabbit 4000 8051 based 80535 Operating Frequency 60MHz 3 6MHz SRAM 1Mb 512 512 RAM 256 bytes Memory Flash 1Mb ROM 64 Kb MicroSD up to 1Gb ADC 11 bits 8 channels 8 bits 8 channels Real Time Clock Yes No Baray Bache Yes 3 3V on board No battery Monitoring Channels 64 64 Control Bits 32 16 Serial RS485 Communication 9 8Kbps Channels Ethernet 10 100Mbps Serial RS485 9 8Kbps 2 SPI ports Programming Method Serial programming EPROM burning ee Dynamic C Assembly Language Command Structure _ ASCII based Protocol based MCM Address setting Hardware Software IP based Hardware only Access from Online Direct or via ABC Via ABC only Application Configurable for RFI Yes using Spectrum No reduction spreader Clock divider List of inputs received from GMRT groups fo
12. r Termination Channel Un Swap Channel Swap 1 occ Ff eHe Orr D7 Key OC Ke e Fr OF D6 or oro Ke KF OF CO he o rroooo D3 oo rfr CO CO D2 re ocococso D1 ooroc c o oo oc ro New MCM Testing Software MTest To test various feature of new MCM we have developed New MCM Testing Software called MTest Using this software we can test Ethernet communication LO setting through SPI bus setting 32 control bits and 64 monitoring channels Mtest has been written in Dynamic C and it can be loaded to New MCM via serial programming cable MTest is web based test software so user need only browser to test New MCM functionalities New MCM can be put into network or it can be connected directly to PC Each MCM has its own IP address so to test New MCM user has to type IP address of MCM into address bar of the web browser to initiate testing By default MCM serves Monitoring page which shows all 64 monitoring channels raw data amp voltage information system status and LO frequency By clicking SET New MCM button user can navigate to setting page At setting page user can set 32 digital bits LO frequency through SPI bus and RFI testing parameters As per users like SigCon Front End Optical Fiber requirement this software will be modified in the next version Following is the snapshot of monitoring window New MCM Monitoring Window MCM IP 192 168 4 10 Antenna C00 64 MO
13. r configuring the MCM Input required from GMRT subsystems includes e Number of monitoring channels e Mapping of monitoring points with 64 MCM channels e Number of control channels e Bit pattern to set system parameters e Complete information about all parameters of particular system to be monitored and or controlled e Special command priority e Number and types of argument to that Parameter e Other Information if any Inputs Received from Analog Back End group i Al Alarm arameter Step size Data type arm Priority Name Boolean Int Float to be raised Information Max Notify Critical Ch1 LO 110MHz 1700MHz 500KHz _ ee Ch2 LO 110MHz 1700M Hz SOOKHz Chi veasw 0 aca Ch2 veasw 0 Boolean itor chi Conversion a Monitor Unit and Range To Monitor Ch2 Conversion a ee a Oe ee O Chi euftesw o a Boolean Na Na COT N E A SY AEST TS Chi symisiggen 0 1 Boolean na na Ch2 sysesen 0 3 Boolean na ma Chisme o 7 a meger na m Ch2emer 0o 7 1 integer na ma cmr o a 1 meger na mMm aer J o 3 1 eee NA NA Analog Back End Control bits oe ae PaaS A ATTENUATION ATTENUATION S Synthesizer Si Signal generator A Antenna N Noise source D Direct M Mixer 1 2 Channel select Inputs Received from Optical Fiber group Unit and Range of Argumen
14. re development using higher level language Ethernet Support e Serial as well as SPI interface support e Low EMI from card e On board data storage e 64 analog monitoring channels e Monitoring signal range 5V e 32 TTL compatible output channels Criteria for using RCM 4300 and Rabbit 4000 processor Nowadays Embedded Development Kits includes all the tools necessary to complete embedded network design including a world class IDE Graphical Debugger Real Time Operating System and TCP IP Stack Every kit includes Integrated peripherals include 10 100 Ethernet SPI Bus and or CAN Bus A D inputs PWM outputs USB and more The available options for Embedded Development Kits were from companies like Rabbit Semi conductor NetBurner PIC etc As far as hardware features and price is concerned most of them are equal The Rabbit Core Module 4300 has few advantages over others e Dynamic C IDE for software development that supports co operative multitasking with C language e On board Ethernet Hardware Inbuilt EMI reduction hardware and software control called as the Spectrum Spreader which reduces EMI by 10cB e More General purpose I O pins are available for design to the user e The GPIO pins have up to FOUR multi function feature e Rabbit semiconductor offers variety of products and long term support The rabbit processor series Rabbit 2000 3000 4000 5000 are still in use New MCM Hardware Architecture
15. t Command Error Default Argument Data type priority messages value or state Parameter Operation P Name ana Step size Boolean Int Information Float Critical Chi 1dB 50dB Integer a Control RF bering EEE 2 1dB 50dB 1dB Integer setting Attenuation 2 Unit and Alarm Parameter oe Data type Alarm 4 Range Step size Boolean Priority Remarks Name Int Float to be raised Information Min Notify Critical OTX unit 1 Laser Bias 1A Critical Laser Bias 1A Monitor Laser Bias 1B SM 1 mV p Laser Bias 1B lt 2 3V Optical transmitter Optical 4 Units aaora O S amv fot Optical 5V imvV Monitor 1B ofw wm roe o f RF amplifier 5V amv Bias 1 To be repeated for 4 Nos of OTX namely OTX1 OTX2 OTX3 and OTX4 Inputs Received from Front End group The MCM card sitting in the common box should have 64 monitoring channels The RF Control and Monitoring RFCM card located in the front end boxes which talk to the MCM through MCM Interface card located in the common box will have 32 monitoring channels per frequency band At present we need only 16 bits to fully control our system However it may be worth allocating 32 bits for future upgrade MCM Channels for Front End Monitoring 01 06 Serialized outputs from six front end boxes 07 16 Band selector bit monitor 2 x 5 0 to 3 4 Volts CH 1 17 24 Solar Attenuator bit monitor 2 x 4 0 to 3 4 Volts CH 1 25
16. to running the optional Dynamic C FAT file system module where data are stored and handled using the same directory file structure commonly used on PCs A removable microSD Card can be hot swapped to transfer data quickly and easily using a standardized file system Description of Rabbit 4000 processor The Rabbit Semiconductor has designed the Rabbit 2000 the Rabbit 3000 the Rabbit 4000 and the Rabbit 5000 microprocessors for use in small and medium scale single board computers over period of time The Rabbit 2000 the Rabbit 3000 do not support Ethernet port and SPI Bus The Rabbit 5000 supports 10 100Base T and 802 11b g Wi Fi network interfaces and CPU clock frequency of 100 MHz But Wi Fi network interface makes it unsuitable for use in New MCM card The Rabbit 4000 is a 8 bit high performance microprocessor with low electromagnetic interference EMI and is designed specifically for embedded control communications and Ethernet connectivity Extensive integrated features and glue less architecture facilitate rapid hardware design while a C friendly instruction set promotes efficient development of even the most complex applications The Rabbit 4000 is fast running at up to 60 MHz with compact code and support for up to 16 MB of memory Operating with a 1 8 V core and 3 3 or 1 8 V I O the Rabbit 4000 boasts an internal 10Base T Ethernet interface eight channels of DMA six serial ports with IrDA 40 digital I O quadrature de
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