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Electronic Trivector Meter

ER300P-PRIDE

Class 0.2S

For

Neyveli Lignite Corporation

LARSEN & TOUBRO LIMITED, MYSORE WORKS

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2.1 Theory of Operation 2.1.1 Analog section 2.1.2 Digital processing section 2.1.3 Power supply section 2.2 Hardware 2.2.1 Compact 2.2.2 Efficient 2.2.3 Ruggedness and Safety 2.2.4 Features 2.2.5 Data Safety 2.3 Software 2.3.1 Definitions 2.3.2 Load survey records 2.3.3 Instantaneous Parameters. 2.3.4 Programmable features 2.3.4.1 External CT/PT ratios 2.3.4.2 RTC Setting 2.3.4.3 Communicating Parameter setting

2.3.4.4 Factory Configurable 2.3.4.5 Accuracy Method

2.3.5 Display Details 2.3.6 Communication 2.3.7 Internal Battery Option

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4. APPENDIX A

Fig 1. Parts/Dimensions Fig 2 3 Ph 4W connection diagram - with CT Fig 3 3 Ph 4W connection diagram - with CT & PT Fig 4 RS 485 connection diagram (top view) Fig 5 RS 485 connection diagram (front view) 5. APPENDIX B - Technical specifications 6. APPENDIX C - MODBUS details and memory map 7. APPENDIX D – List of errors

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failure and CT open are also indicated instantaneously. • 15 minutes Load Survey recorders for 40 days

1. Forward Wh 2. Reverse Wh 3. Forward VArh 4. Reverse VArh

and Tampers are recorded. • Meter configuration/data collection possible through

- RS485 port using MODBUS protocol. - Optically isolated serial interface using DCD.

• kWh & kVArh pulse output LEDs available on front

panel. • LCD Segments for indicating presence of voltages in

each phase separately is available. • LCD, with back lighting and of extended temperature, to

display various parameters. • Keys on the front panel to scroll through display

parameters. • Rugged polycarbonate casing makes it a good insulator

and so no external "EARTHING TERMINAL” is required. • Built in self-supervision.

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High precision current transformers and voltage transducers step down input currents and voltages, that are fed to an Analog to Digital converter 2.1.2. DIGITAL PROCESSING SECTION A powerful microprocessor controls the analog and digital sections. The digital samples are processed to obtain various metering data that is stored in non-volatile memory. A high precision real time clock controls all time keeping activities. External interface is through Display, Keyboard, RS485 Communication port and Optical Communication port.

2.1.3. POWER SUPPLY SECTION A switched mode power supply supplies power to the meter’s internal circuitry. 2.2 HARDWARE The hardware of the meter has been designed to make it light in weight, rugged, reliable and safe for the users. 2.2.1. Compact The meter is designed using Surface Mount Technology, which makes it light in weight and compact.

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meters that use LED displays. 2.2.3. Ruggedness and safety All components used in the meter are of extended temperature range, which makes the meter ideal for tropical climates. The meter’s top and bottom covers are made of polycarbonate, which is a good insulator. The meter is safe for the user. The meter’s casing and terminal block have been made of non-flammable plastic material. 2.2.4. Features

• LEDs - LEDs for Wh & VArh. PULSE outputs are available on front panel.

• Keys - In closed condition, two keys are provided on

the front panel, for scrolling through the display. • LCD - The meter uses an extended temperature LCD,

with back lighting, which displays various parameters.

• RS485 port – for communication using MODBUS protocol

• Optical port – for serial communication.

2.2.5. Data safety

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RTC with battery backup is used for time keeping. It has a calendar of 100years.

• Watch dog timer is used to monitor the processing

activities that ensures the reliable operation of the meter.

• Power down sensor senses power failure and shuts

down the system safely. • Data security lock is provided for storing metering

data. This makes the metering data immune to spurious signals on power lines.

• The meter is designed to conform to IEC standards for

EMI/EMC, which makes the system immune to Electromagnetic Interference.

• Periodic setup/program data check is carried out

and anomaly is indicated on error occurrence.

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Method of energy computation: All energies are of fundamental component only. Following method is adopted for forward/reverse energy calculations - Forward Wh: (W1 + W2) Reverse Wh: (W3 + W4) Forward VArh: (R1 + R4) Reverse VArh: (R2 + R3) Where W1, W2, W3 & W4 are the absolute active energies & R1, R2, R3 & R4 are the absolute reactive energies in the four quadrants.

Note: All energies are of fundamental component only.

0

W2 W1 R2 R1 270 90

W3 W4 R3 R4

180

• Average freq. –

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minutes time blocks will be contracted by ten seconds each. • Retard RTC command:

When Retard RTC command is given, six consequent 15 minutes time blocks shall be elongated by ten seconds each.

2.3.2. LOAD SURVEY RECORDERS All energies, voltages and currents are of fundamental component only. Load survey data at 15 minutes interval for 40days:

1. Forward Wh 2. Reverse Wh 3. Forward VArh 4. Reverse VArh

5. Average frequency 6. Average of 3 phase voltages 7. Tamper details

Resolution (without CT and PT ratios) Energy: 2 decimals (xxx.xx Wh/VArh)

Frequency: 3 decimals (xx.xxx Hz) Voltage: 2 decimals (xxx.xx V)

Tamper details: Voltage failure, CT open, CT or PT setting tampered, Meter malfunction, Power fail, Advance command, Retard command and RTC set command details are available.

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b Phase voltages. c> Phase currents. d> Active Power. e> Reactive Power. f> Apparent Power. g> Total Power Factor. h> Average Frequency. i> Tamper Status.

Format: Bit nos. 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 x x x x x x x x s r a x e t c v where v = voltage failure (immediate status) c = CT open (immediate status) t = CT or PT setting done (of running 15 mins block) e = Meter mal-function (of running 15 mins block) a = advance RTC (of running 15 mins block) r = retard RTC (of running 15 mins block) s = RTC set (of running 15 mins block) x = don’t care

(bit is set if event occurred) j> Time. k> Cumulative Energies. l> Anomaly string

2.3.4 PROGRAMMABLE FEATURES All the below given features are programmable through RS485 port & DCD 2.3.4.1. EXTERNAL CT/PT RATIOS The meter can be programmed for external CT/PT ratios.

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2.3.4.2. RTC SETTING RTC setting

For RS485, PC software can have password protection. Password protection on meter for DCD. No hardware protection.

a> SYNC RTC time setting (absolute RTC command) b> Advance RTC command

Contracts six consecutive 15 minutes. Time blocks by 10secs each.

c> Retard RTC command Expands six consecutive 15 minutes. time blocks by 10secs each.

Between advance/retard command there will be a lockout period of 7 days. If power fails before completion of all time blocks of advance/retard command, then on power on, the balance correction will be done in the following 15 minutes time blocks. Pending advance/retard commands are aborted by sync RTC command. 2.3.4.3 COMMUNICATING PARAMETERS SETTING Meter ID, baud and parity settings used by MODBUS communication only, can be changed through DCD, with password protection. (Default setting of MODBUS: Meter ID =01, baud = 9600, parity = none) DCD to meter optical head, communication parameters are fixed – i.e. 4800 baud, even parity, 7bit, 1start bit and 1 stop bit.

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Each meter is given a unique number at factory. 2.3.4.5. ACCURACY METHODS: • Pulse method - PULSES/Wh: 10 for 5A meter 50 for 1A meter

PULSES/VArh: 10 for 5A meter 50 for 1A meter • Accuracy check using DCD (MRI) - Energies are in Watt-hours.

2.3.5. DISPLAY DETAILS • LCD-The parameters calculated by the meter are displayed

on a LCD with back Lighting. • Scroll rate - The scroll rate of the display parameters in

the Auto scroll mode is 3 seconds. • Display modes-

a> Manual scrolling – Manual scrolling within a display mode is possible by using UP or DOWN keys.

b> Auto scrolling – The display on the meter changes as per the sequence given at scroll rate.

• Mode Switching – Switching between Manual and Auto

Scrolling Mode is possible by simultaneously pressing the UP and DOWN keys.

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iii. kW “ xx.xxxx ”

“Pr kW ” iv. kVAr “ xx.xxxx ”

“Pr kVAr ” v. kVA “ xx.xxxx ”

“Pr kVA ” vi. R phase Line voltage “ xxx.xx ”

“L1 V ” vii. Y phase Line voltage “ xxx.xx ”

“L2 V” viii. B phase Line voltage “ xxx.xx ”

“L3 V” ix. R Phase voltage “ xxx.xx ”

“U1 V” x. Y Phase voltage “ xxx.xx ”

“U2 V” xi. B Phase voltage “ xxx.xx ”

“U3 V” xii. R Phase currents “ xx.xxx ”

“A1 A” xiii. Y Phase currents “ xx.xxx ”

“A2 A” xiv. B Phase currents “ xx.xxx ”

“A3 A” xv. Power factor “ PF x.xxx ”

“Pr ” xvi. Frequency “ xx.xxxx Hz ”

(of running 15mins block)

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C kVArh xx. Cumulative reverse “-- ← ”

kVArh “ xxx.xxxx ” “C kVArh”

xxi. Final reading of forward Wh (00:00hr reading of present day)

“ → + ” “ xxxx.xxxx ” “P1 kWh”

xxii. Initial reading of forward Wh (00:00hr reading of previous day)

“→ + ” “ xxxx.xxxx ” “P2 kWh”

xxiii. Final reading of reverse Wh (00:00hr reading of present day)

“-- ← ” “ xxxx.xxxx ” “P1 kWh ”

xxiv. Initial reading of reverse Wh (00:00hr reading of previous day)

“-- ← ” “ xxxx.xxxx ” “P2 kWh”

xxv. Serial no. “NLC01 ” Cumulative Energy and Power format on display CT ratio * PT ratio Energy Power

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2.3.5 COMMUNICATION

• RS485 port with MODBUS Protocol. From this port Data (Load survey and instantaneous) can be collected, and Parameters can be configured. Refer to Annexure C for details.

• Optically Isolated serial interface port confirming to IEC 1107 Protocol. Through this port, Parameter setting/ Data collection (Only Load survey) is possible.

2.3.7 INTERNAL BATTERY OPTION In absence of power, the meter can be operated using the battery (NiCd) for viewing the display, collecting data.

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3.2 Re-packing If the meter has to be returned to the supplier, repack the unit in the packing in which it was supplied. 3.3 Optimum Field Conditions For the reliability and better life of the product the unit has to be operated at moderate temperatures and humidity. The meter is designed to work from -5 to 60 deg C and humidity of 95% RH non-condensing. 3.4 Storage In case if the meter is not installed after receiving, it has to be stored in a dry place in the original packing material. 3.5 Mounting The meter can be fixed on any flat, even surface or on a standard metering panel on three points, one on top used for hanging the meter and the other two at the bottom used to mount the meter. 3.6 Extra precautions

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Hence it DOES NOT HAVE ANY EARTH TERMINAL . For the WIRING connections the terminal block has been provided with 8 terminals. The WIRING connections are to be done as shown in the Appendix A. Terminal cover is to be used to protect the meter terminals from being tampered with. As soon as the connections are made the terminal block has to be covered and sealed by terminal cover. It can be fixed using two screws.

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kVArH

MYSORE, INDIALARSEN & TOUBRO LIMITED,Manufactured by

R Y B

Sl.No.

BATT RST

Pulse Rate

Freq.

Volt kWH

Property of

Class 0.5

3 phase

AV Curr

MF

/Unit

50Hz

wire system3

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3PHASE 4 WIRE

WIRE CONNECTION DIAGRAM WITH CT Fig. 2

RYB

a a a ab b b

B B BA A A

3PHASE 4 WIRE WIRE CONNECTION DIAGRAM WITH CT & PT

RYBN

k lK L

k lK L

k lK L

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RS 485 connection diagram (Top View) Fig 4

RS 485 connection diagram (Front View) Fig 5

Screws

Tx -

Tx + Gnd

1 2 3 4 5

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Current (In) 5A or 1A (to 150%) Power Factor 4 quadrant operation Frequency 50 Hz +10% Electromagnetic compatibility IEC 687 Case material Plastic moulded with transparent cover.

Protected to IEC 687

Insulation properties HV & insulation resistance as per IEC 687

Temperature -50c to 600c for operation

-200c to 700c for storage Humidity 95% RH non-condensing Dimension 320L x 175W x 110H Weight < 2.5Kgs

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1.1) Interface Standard: The configuration details to communicate with the meter are given below-

Standard RS485 (half duplex) Baud rate Selectable- 9600, 4800, 2400,1200,600

or 300 bps Parity Selectable- None, odd or even Start bit 1 Stop bit 1

1.2) Protocol: The RS485 interface uses MODBUS Protocol in RTU mode. Communicating with the meter involves sending commands to the meter for reading and writing the particular register. The meter can be addressed with specific user defined meter address (slave ID) from 1-255.

2. DETAILS OF MODBUS PROTOCOL In the explanation of protocol the examples used are specific to L&T meters. The details of the protocol are also limited to L&T meters. 2.1) Remote Terminal unit Framing: In RTU mode data is sent as 8-bit binary characters. In RTU mode, message characters must be transmitted in a continuous mode. The receiving device monitors the elapsed time between receipt of characters i.e. inter byte delay. If inter byte delay is three and one half the character time (for e.g. at 9600bps, the max. inter byte delay expected will be 1ms*3.5), the receiving device can timeout.

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8 BITS 8 BITS N * 8 BITS 16 BITS

2.2) Address field: The meter can be addressed with specific user defined address from 1-255. Each slave must be assigned a unique address and only the addressed slave responds to query that contains its address. When the slave responds, the slave address informs the master which slave is communicating. In broadcast message, an address of 0(zero) is used. All slaves interpret this as an instruction to read and take action on the message, but do not issue a response message. 2.3) Function field: The function code field tells the addressed slave what function is to be performed. The higher order bit in this field is set by the slave device to indicate that other than a normal response is being transmitted to the master device (See SECTION 3 for exception response). The following functions have been implemented in the meter.

CODE MEANING ACTION 03 Read Holding Registers Obtains current binary value

in one or more holding registers.

04 Read Input Registers Obtains the binary value of input registers in the slave.

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slave in response to a query. 2.5) Error Check Field: This allows the master and slave device to check a message for error transmission. The error check field uses a CRC-16 check in the RTU mode. 2.6) Data Addresses in Modbus Messages: All data addresses in Modbus messages are referenced to zero. The first occurrence of a data item is addressed as item number zero. For example:

• Holding registers 40001 is addressed as register 0000 in the data address field of the message. The function code field already specifies a “Holding Register” operation. Therefore the “4XXXX” reference is implicit.

• Holding register 40108 is addressed as register 006B hex (107 decimal).

3. EXCEPTION RESPONSES Exception response is a notification of an error. The exception response codes are listed in the table 3-1.When a slave detects one of these errors, it sends a response to the master consisting of slave address, function code, error code and error check field. To indicate that the response is a notification of an error, the high order bit of the function code is set to 1. Table 3-1

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addressed slave location. 03 ILLEGAL DATA

VALUE The value referenced in the data field is not allowable in the addressed slave location.

Example: Query Message

SLAVE ADDR

FUNC

H.O START ADDR

L.O. START ADDR

H.O NO. OF REG

L.O NO. OF REG

ERROR CHECK FIELD

ERROR CHECK FIELD

0A 01 00 24 00 02 FC BB

The query requests the status of input 0036 in slave no.10. Since the function is an invalid function for the L&T meters so the following error response will be generated. Response Message

SLAVE ADDR

FUNC EXCEPTION CODE

ERROR CHECK

ERROR CHECK

0A 81 01 F0 52

The function code field is the original function code with the high order bit set and exception code 01 indicates an illegal function field.

4. EXPLANATION OF VARIOUS FUNCTION The purpose of this section is to define the general format for the specific command available to programmers. The form of each

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The addressing allows up to Max.90 registers to be obtained at each request. Broadcast mode is not allowed. The below example reads registers of R phase voltage from slave number 24(decimal). Since CT Primary is stored in the address 40001 and 40002 so to read CT Primary voltage both addresses should be read simultaneously. Example: Query Message

SLAVE ADDR

FUNC

H.O START ADDR

L.O. START ADDR

H.O NO. OF REG

L.O NO. OF REG

ERROR CHECK FIELD

ERROR CHECK FIELD

18 03 00 00 00 02 C6 02

NOTE: If a particular parameter is stored in more than one address location. Then for reading that particular parameter all the address locations should be read simultaneously. Otherwise meter will not respond or the response will not be the correct value. For further details see memory map of parameters. Response: The addressed slave will respond with its address and the function code, followed by the information field. The information field contains 1 byte describing the quantity of data bytes to be returned. The contents of register requested (DATA) are two bytes each. The first byte includes the higher order bits and the second byte includes lower order bits. Response Message

SLAVE ADDR

FUNC

BYTE COUNT

DATA O/P

DATA O/P

DATA O/P

DATA O/P

ERROR CHECK

ERROR CHECK

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contents of holding register in the addressed slave. The addressing allows up to Max.90 registers to be obtained at each request. Broadcast mode is not allowed. The below example reads registers of Forward Active Cumulative energy from slave number 19(decimal). Since Forward Active Cumulative energy is stored in the address 30023 and 30024 so to read Forward Active Cumulative energy both addresses should be read simultaneously. Example: Query Message

SLAVE ADDR

FUNC H.O START ADDR

L.O. START ADDR

H.O NO. OF REG

L.O NO. OF REG

ERROR CHECK FIELD

ERROR CHECK FIELD

13 04 00 16 00 02 92 7D

NOTE: If a particular parameter is stored in more than one address location. Then for reading that particular parameter all the address locations should be read simultaneously. Otherwise meter will not respond or the response will not be the correct value. For further details see memory map of parameters. Response: The addressed slave will respond with its address and the function code, followed by the information field. The information field contains 1 byte describing the quantity of data bytes to be returned. The contents of register requested (DATA) are two bytes each. The first byte includes the higher order bits and the second byte includes lower order bits.

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will be 24038.So to get the Forward Active Cumulative energy this particular value should be multiplied with the specified multiplication factor (MF) which is 0.1 in this case (For further details see the memory map of the parameters). So 24038 x 0.1=2403.8Wh which is Forward Active Cumulative energy. 4.3) Preset Single Register (Function Code 06) CAUTION: Function (06) will overwrite controller memory. Function (06) allows the user to modify the contents of a holding register. The contents of only those holding registers can be modified which are editable only. The values are provided in binary, up to the maximum capacity of the controller (16-Bits in L&T meters) and unused higher bits must be set to zero. When used with slave address zero (Broadcast mode), all slave controllers will load the specified registers with the content specified. Example: This example will set the Baud Rate in slave number 17.The address of Baud Rate is 40010 and value to be programmed is 03.

Query Message SLAVE ADDR

FUNC H.O START ADDR

L.O. START ADDR

DATA VALUE H.O

DATA VALUE L.O

ERROR CHECK FIELD

ERROR CHECK FIELD

11 06 00 09 00 03 1B 59

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If the value is an illegal value then the response message will be an exception response (Error message). For the details of maximum and minimum values of any parameter refer to manual. NOTE: For programming RTC the values the data for setting the RTC should be BCD (Binary Coded Decimal). For Advance and Retard Command Example: For setting date 29 and day 5 at location 40013 the query message will be as follows Query Message

SLAVE ADDR

FUNC H.O START ADDR

L.O. START ADDR

DATA VALUE H.O

DATA VALUE L.O

ERROR CHECK FIELD

ERROR CHECK FIELD

11 06 00 0C 29 05 94 CA

4.4) Preset Multiple Registers (Function Code 16) CAUTION: Function (16) will overwrite controller memory. Function (16) allows the user to modify the contents of holding registers. The contents of only those holding registers can be modified, which are, write able only. The values are provided in binary up to the

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This example will set the PT primary and PT secondary value in slave number 17.The address of PT primary is 40005,PT secondary is 40007 and value to be programmed for PT primary and PT secondary is 50,000 and 1,000 respectively.

Query Message ADDR

FUNC

HOADDR

L.O.ADDR

QTY. H.O

QTY. L.O

BYTE SENT

H.O DATA

L.O DATA

11 10 00 04 00 04 08 00 00

H.O DATA

L.O DATA

H.O DATA

L.O DATA

H.O DATA

L.O DATA

ERR FIELD

ERR FIELD

C3 50 00 00 03 E8 86 38

The normal response to a preset multiple register request is to echo the address function code, starting address and number of registers to be loaded. Response Message

SLAVE ADDR

FUNC H.O START ADDR

L.O. START ADDR

QUANTITY H.O

QUANTITY L.O

ERROR CHECK FIELD

ERROR CHECK FIELD

11 10 00 04 00 04 82 9B

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Address Parameters Words MF Multipl

y PT ratio

Multiply CT ratio

INSTANTANEOUS PARAMETERS Read Only Parameters (Function Code 4)

30001 R Line Voltage (unsigned integer) 1 0.01 Yes No

30002 Y Line Voltage (unsigned integer) 1 0.01 Yes No 30003 B Line Voltage (unsigned integer) 1 0.01 Yes No 30004 R Phase Voltage (unsigned integer) 1 0.01 Yes No 30005 Y Phase Voltage (unsigned integer) 1 0.01 Yes No 30006 B Phase Voltage (unsigned integer) 1 0.01 Yes No 30007 R Phase Current (unsigned integer) 1 0.001 No Yes 30008 Y Phase Current (unsigned integer) 1 0.001 No Yes 30009 B Phase Current (unsigned integer) 1 0.001 No Yes 30010 Total Active Power (W) (Signed integer) 1 0.1 Yes Yes 30011 Total Reactive Power (VAr) (Signed integer) 1 0.1 Yes Yes 30012 Total Apparent Power (VA) (Signed integer) 1 0.1 Yes Yes

30013 Total Power Factor (Signed integer) (if value >100 then not valid) 1 0.01 No No

30014 Average Frequency (unsigned integer) 1 0.001 No No 30015 Tamper status (unsigned integer)

Format: Bit nos. 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 x x x x x x x x s r a x e t c v where v = voltage failure (immediate status) c = CT open (immediate status) t = CT or PT setting done (of running 15 mins block) e = Meter mal-function (of running 15 mins

1 1 No No

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30021 Current Time: Format: Hour, Minute (BCD, BCD) 1 1 No No

30022 Current Time: Format: Second, dummy (BCD, -) 1 1 No No

30023 Cumulative energy - forward Wh (unsigned long) 2 0.1 Yes Yes

30025 Cumulative energy - reverse Wh (unsigned long) 2 0.1 Yes Yes

30027 Cumulative energy - forward VArh (unsigned long) 2 0.1 Yes Yes

30029 Cumulative energy - reverse VArh (unsigned long) 2 0.1 Yes Yes

30031

Anomaly string Format: Ascii (ENRX) where E– flash code corruption, N - set-up corruption, R - RTC corruption, X-exception

2 1 No No

30033 00:00 hr forward Wh of present day- unsigned long 2 0.1 Yes Yes

30035 00:00 hr forward Wh of previous day –unsigned long 2 0.1 Yes Yes

30037 00:00 hr reverse Wh of present day- unsigned long 2 0.1 Yes Yes

30039 00:00 hr reverse Wh of previous day- unsigned long 2 0.1 Yes Yes

30041 CT Tapping - (01 – 1A tapping, 05 – 5A tapping) 1 1 No No

LOAD SURVEY PARAMETERS FOR LATEST 15 MINS BLOCK

Read Only Parameters (Function Code 4)

Address Parameters Words MF

Multiply PT ratio

MultiplyCT ratio

30081 Current Time: Format: Year Month (BCD, BCD) 1 1 No No

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Whe (Reverse Wh) unsigned integer 1 0.01 Yes Yes Rhi (Forward VAr) unsigned integer 1 0.01 Yes Yes Rhe (Reverse VAr) unsigned integer 1 0.01 Yes Yes Af (Average frequency) unsigned integer 1 0.001 No No

Av (Average Voltage) unsigned integer 1 0.01 Yes No Ta (Tamper bits) unsigned long

Bit nos. 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 x x x x x x x x s r a p e t c v where v = voltage failure c = CT open t = CT or PT setting done e = Meter mal-function p = power fail a = advance RTC r = retard RTC s = RTC set x = don’t care (bit is set if event occurred)

1 1 No No

LOAD SURVEY PARAMETERS FOR LATEST 00:00hr ENERGIES

Read Only Parameters (Function Code 4) 30092 Load survey – cumulative energies at latest

00:00hr Format: Whi Whe Rhi Rhe where -

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Whi (Forward Wh) unsigned long 2 0.1 Yes Yes Whe (Reverse Wh) unsigned long 2 0.1 Yes Yes Rhi (Forward VArh) unsigned long 2 0.1 Yes Yes Rhe (Reverse VArh) unsigned long 2 0.1 Yes Yes

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N 1 for latest but one 15 mins block. …… N=3839 for the oldest 15mins block (40 days back) 30201+N

Current Time: Format: Year Month (BCD, BCD) 1 1 No No

Current Time: Format: Date Day (BCD, BCD) 1 1 No No

Current Time: Format: Hour, Minute (BCD, BCD) 1 1 No No

Current Time: Format: Second, dummy (BCD, -) 1 1 No No

Load survey – latest complete 15 mins block 7

Format= Whi Whe Rhi Rhe Af Av Ta where-

Whi (Forward Wh) unsigned integer 1 0.01 Yes Yes Whe (Reverse Wh) unsigned integer 1 0.01 Yes Yes Rhi (Forward VAr) unsigned integer 1 0.01 Yes Yes Rhe (Reverse VAr) unsigned integer 1 0.01 Yes Yes Af (Average frequency) unsigned integer 1 0.001 No No

Av (Average Voltage) unsigned integer 1 0.01 Yes No Ta (Tamper bits) unsigned long

Bit nos. 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 x x x x x x x x s r a p e t c v where v = voltage failure c = CT open t = CT or PT setting done e = Meter mal-function p = power fail a = advance RTC r = retard RTC s = RTC set

1 1 No No

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(BCD, BCD) 1 1 No No

Current Time: Format: Date Day (BCD, BCD) 1 1 No No

Current Time: Format: Hour, Minute (BCD, BCD) 1 1 No No

Current Time: Format: Second, dummy (BCD, -) 1 1 No No

Load survey – cumulative energies at latest 00:00hr

Format: Whi Whe Rhi Rhe where - 8

Whi (Forward Wh) unsigned long 2 0.1 Yes Yes Whe (Reverse Wh) unsigned long 2 0.1 Yes Yes Rhi (Forward VArh) unsigned long 2 0.1 Yes Yes Rhe (Reverse VArh) unsigned long 2 0.1 Yes Yes 35041

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40001 CT Primary 2 1 No No 40003 CT Secondary 2 1 No No 40005 PT Primary 2 1 No No 40007 PT Secondary 2 1 No No

Read (Function code 3)&write parameters (Function code 6 / 16) Real time clock (RTC)

40009 Meter id (1 to 255) 1 1 No No

40010 Baud (unsigned integer)

1=300, 2=600, 3=1200, 4=2400, 5=4800, 6=9600

1 1 No No

40011 Parity (unsigned integer) 0=none, 1=odd, 2=even 1 1 No No

40012 Current Time: Format: Year Month (BCD, BCD) 1 1 No No

40013 Current Time: Format: Date Day (BCD, BCD) 1 1 No No

40014 Current Time: Format: Hour, Minute (BCD, BCD) 1 1 No No

40015 Current Time: Format: Second, dummy (BCD, -) 1 1 No No

40016

Advance command (Write – Executes Advance command, Format: 0006) (Read – Gets the no. Of 15mins blocks pending for RTC advancement, Format: 0006 to 0000)

1 1 No No

40017

Retard command (Write – Executes Retard command, Format: 0006) (Read – Gets the no. of 15min blocks pending for RTC retardation, Format: 0006 to 0000)

1 1 No No

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customer thereof gives satisfactory proof to L&T within the Warranty period. 1. L&T’s shall provide repairs and maintenance service for all equipment sold/or distributed by L&T, and products which cannot be repaired by L&T will be returned, subject to L&T's prior consent for free repairs. 2.Defective parts shall be serviced or replaced by L&T on one-way freight paid basis. This warranty does not cover any defect in the product caused by accident, misuse, neglect, alteration modification or substitution of any of the components or parts, or any attempt at internal adjustment by unauthorized service personnel. Under no circumstance shall L&T be liable for any consequential or resulting injury or for loss, damage of expense directly or indirectly from the use of this product. The foregoing warranty is in lieu of all other warranties, expressed or implied, and is the sole and exclusive remedy for any claim arising from any defect in L&T products. Disclaimer Sufficient care is taken to provide all information regarding the product but L & T does not claim any responsibility for the damages caused by using the product directly or indirectly.