.: EPETEKNIK SDN BHD :.
 TECHNICAL SPECIFICATIONS FOR RAINFALL EVENT LOGGER
 
         Technical Specification
 
 Processor And Memory
 CPU Dallas Microcontroller
 CPU Speed 11.0592 MHz (Max 33MHz)
 CPU Performance 2.7648MIPS on 11.0592MHz or 8.25 MIPS on 33MHz
 RAM 1KByte on-chip SRAM
256Byte non-volatile SRAM backup by on-board Lithium battery for10 years without external power
 EPROM 16KByte UVEPROM for storage of program memory
 EEPROM 512KByes EEPROM chip as ring type data storage memory
 Real Time Clock Non-volatile RTC (Calendar), backup by on-board lithium battery for 10 years operation without external power
RTC format: 1/256 sec, sec, min, hour, day, month, year
 Pulse / Event Input
 Type 4-pin screw-free terminal for easy configuration between voltage input with Opto-isolation or accept contact closure
 Voltage Input Range 5V - 13V DC (external supply or dry-cell battery supply)
 Surge Protection 27V Metal Oxide Varistor (MOV)
 Counter/Accumulator 1 channels, maximum response 1 KHz (able to use hardware filter to limit pulse rate of 1 pulse / second)
 Communication
 Serial Port One RS232C serial port
 Port information Internal to MCU. For laptop programming / interrogation / logged data retriever
 Interface RS232C with RXD, TXD, DTR and RTS
 RS-232 connector type DE-9 female with retention screws (DCE)
 Data length 7 or 8 data bits
 Data Parity None
 Baud Rate 50,300,600,1200,2400,4800,9600,19200 baud programmable
 Retrieving speed 50 seconds to download 6,500mm of rainfall based on baud rate of 19200BPS
 Gauge/Instrument Interface
 Raingauge Tipping bucket rain-gauge
 Transducer Reed switch contact closure
 Range 0 – 99999mm
 Resolution 0.5mm (optional 1 mm, 0.1mm or 0.2mm)
 Accuracy 0.5mm
 Interface opto-isolated pulse input / accumulator
 Other feature Settable accumulative rainfall counter in event logger
 Software Parameters And Operation
 Serial Number 8 digit number stored in EEPROM
 Rainfall Counter settable rainfall counter from portable retriever (normally initialized to zero after every retrieving)
 Previous retrieve Store and display Previous retrieve date/time on portable
 date/time retriever for information on previous retrieve date/time
 Start Logging Activation of start logging using "TEST
 Four set of Poll ID Four set of pointer with separate poll ID (settable in portable retriever) allow same set of logged data to be retrieved by 4 different set of retriever / or 4 times
 Date and Time Settable data and time follows portable retriever date/time
 Data Storage Event data stored in EEPROM in the format of date /time accurate to every seconds using 5 bytes for each tips
 Set factory default Set to factory default by using DIP switch during power ON / battery insertion without disturbing date/time and serial number
 Stop Mode After switch the "RUN/STOP" switch to Stop Mode, no data is logged into the logger memory, allow testing pulse input of logger and tipping bucket by observing the Red
LED which blink once when every tips received
 Run Mode After switch the "RUN/STOP" switch to Run Mode, all data is logged into the logger memory and every tips received with blink the Green LED once
 Automatic Testing Perform automatic self-test after power ON/ battery insertion and blink both LED alternative for 10 seconds to indicate any internal error
 Check Battery Voltage Automatic checking for battery low at all time and indicate battery low by blinking both LED simultaneously for 10 seconds an hour and also blinking both LED simultaneously for 10 seconds after power ON / battery insertion
Note: the 4x 1.5V (6V) AA Battery still able to operate logger for another 1 month after battery low indicator start indication (logger operating voltage 3.5V-5V)
 Supervisory Circuitry / Fail Save Features
 Internal watchdog timer An COP watchdog timer system on-chip of MCU
 Power Supply
 Supply 6V DC from 4 no of 1.5V AA size dry-cell battery (2000mAH), supply input range from 3.5V to 16.5V
 Regulator on-board low dropout 5V regulator
 Over-voltage protection 27V varistor on unregulated supply voltage 6.7V zener diode on regulated 5V supply
 Internal battery backup CR2032, 3V 220mAH Lithium battery to backup Real Time Clock and MCU internal RAM when external dry-cell battery is removed or replaced Not consumed when dry-cell battery is connected, able to operate minimum2 years without dry-cell supply
 Power consumption 99.999967% of the time, the logger is operating in sleep mode which consume 60micro-AH allow un-interrupted operation for more then 2 years using from 4 x 1.5V AA size dry-cell battery (logger active for 12m seconds when read and store rainfall event in memory)
 Status Indication
 Battery Low Warning Both Green and Red Indicator blinking for 5 seconds every hour or after battery is inserted
 Pulse input status Blink Red indicator once when logger in Stop Mode and blink Green indicator once when logger in Run Mode
 Set Factory Default Both Green and Red Indicator blinking simultaneously for 5 seconds after set factory default / data memory cleared
 Self Test Error Both Green and Red Indicator On simultaneously for  5seconds if detected internal error

             

 
 
Home |  Site Map  |  E-mail
Copyright © 2003 Epeteknik Sdn Bhd