Lumel ND25 Manuale utente

ND.25

POWER NETWORK METER

USER’S MANUAL

FOR INTERFACE

Section Contents

1. Introduction

2. Communication Parameter selection screen

2.1 Address Setting

2.2 RS 485 Baud rate

2.3 RS 485 Parity

2.4 Quit Communication Parameters

3. RS 485 ( ModBus ) Output

3.1 Accessing 3X and 4X registers for Reading Measured values

3.2 Accessing 4X register for Reading & Writing Settings

3.3 User Assignable Modbus Registers

4. Datalogging

4.1 Event Based Datalogging

4.2 Time Based Datalogging

4.3 Load Proﬁle Datalogging

5. Connection for RS 485

1

The Multifunction Energy Meter is a panel mounted 96 x 96mm DIN Quadratic Digital Panel Meter, which

measures important electrical parameters in 3 ph 4 wire / 3 wire / 1ph Network and replaces the multiple

analog panel meters. It measures electrical parameters like AC voltage, Current, Frequency, Power, Energy

(Active / Reactive / Apparent), phase angle, power factor,individual harmonics & many more. The instrument

integrates accurate measurement technology (All Voltages & current measurements are True RMS upto 31st

Harmonic) with LCD display with backlit.

It can be conﬁgured & Programmed at site for the following :PT Primary, PT Secondary, CT Primary, CT

Secondary , 3 Phase 3W, 3 Phase 4W, 1 Phase 2W system.

The front panel has three push buttons using which the user can scroll through different screens & conﬁgure

the product. The front panel also has Impulse red led, ﬂashing at rate proportional to measured power.

Up Key

Enter Key

Down Key

Energy/Counter Screen

Measurement Screen

Load Graphics

Phase Sequence

Indication

Impulse LED

1. Introduction

Operation via standard RS485 is also possible. Through this optional interface all the above mentioned

parameters can be conﬁgured and programmed. For modbus service, it is essential that device address, baud rate

and parity should be conﬁgured properly.

This document speciﬁes only the interface between a Master device and Meter for electrical variable through

MODBUS over RS485.

2

Press “ ” to enter into edit mode, prompt for ﬁrst digit. (Flashing digit

indicates cursor position).

Press the “ ” and “ ” keys to scroll the value of the ﬁrst digit. Press the

“ ” key to advance to next digit.

Similarly, enter second and third digits of address. After entering third digit,

pressing “ ” key conﬁrms the selection and shows “Address Setting”

screen (see Section 3.2.2.1).

2.1 Address Setting

This screen applies to the RS 485 output only. This screen allows the user

to set RS 485 address for the meter.

The allowable range of addresses is 1 to 247.

Press “ ” key to advance to “RS 485 Baud Rate” screen (see Section

2.2) or press the “ ” key to advance to the “Quit Communication

Parameters” screen (see Section 2.4).

2. Communication Parameter Selection Screen

2.2 RS 485 Baud Rate

k

This screen allows the user to set Baud Rate of RS 485 port. The values

displayed on screen are in kbaud.

Pressing “ ” key accepts the present value and advance to the “RS 485

Parity Selection” screen (see Section 2.3) and pressing the “ ” key

accepts the present value and advance to the “Address Setting”

screen(see Section 2.1).

Pressing the “ ” key advances to the “Baud Rate Edit” mode and “ ” &

“ ” keys scrolls the value through 4.8, 9.6, 19.2, 38.4 and 57.6 kbaud.

Pressing the “ ” key sets the value and shows the “RS 485 Baud Rate” screen (see Section 2.2).

While using USB port communication the Conﬁguration must be :

Device address: 001 Baud rate : 57600

Parity : None Stop bit: 1

3

2.3 RS 485 Parity

This screen allows the user to set Parity & number of stop bits of RS 485 port.

Pressing “ ” key accepts the present value and advances to “Quit

Communication Parameters” screen (see section 2.4).

Similarly, pressing “ ” key accepts the present value and advances to

“RS 485 Baud Rate” screen (see section 2.2).

Pressing the “ ” key advances to the “Parity & Stop bit Edit” mode &

keys “ ” and “ ” scrolls the value through:

no 1 : no parity with one stop bit no 2 : no parity with two stop bit

E : even parity with one stop bit odd : odd parity with one stop bit

Pressing “ ” key sets the value and advances to “RS 485 Parity Selection” screen (see Section 2.3).

2.4 Quit Communication Parameters

This screen allows user to exit from system “Communication

Parameter Selection” setup.

Pressing the “ ” key advances to “Communication Parameter Selection”

screen (see Section 2.1).

Similarly, pressing the “ ” key advances to “RS 485 Parity” screen (see

Section 2.3).

Pressing the “ ” key advances to “Communication Parameter Selection ”

screen (see Section 2).

3. RS 485 ( ModBus ) Output :

THE MULTIFUNCTION INSTRUMENT supports MODBUS (RS485) RTU protocol (2-wire ) .

Connection should be made using twisted pair shielded cable. All "A" and "B" connections are daisy chained

together. The screens should also be connected to the “Gnd” terminal. To avoid the possibility of loop currents,

an Earth connection should be made at one point on the network. Loop (ring) topology does not require any

termination load. Line topology may or may not require terminating loads depending on the type and length of

cable used. The impedance of the termination load should match the impedance of the cable and be at both

ends of the line. The cable should be terminated at each end with a 120 ohm (1/4 Watt min.) resistor.

RS 485 network supports maximum length of 1.2km. Including the Master, a maximum of 32 instruments can

be connected in RS485 network. The permissible address range for The Meter is between 1 and 247

for 32 instruments. Broadcast Mode (address 0) is not allowed.

The maximum latency time of a Meter is 300 ms i.e. this is the amount of time that can pass before the ﬁrst

response character is output.

4

After sending any query through software (of the Master), it must allow 300ms of time to elapse before assuming

that the Meter is not going to respond. If slave does not respond within 300 ms, Master can ignore the previous

query and can issue fresh query to the slave.

16 Presets Multiple Registers Set the content of read / write locations ( 4X )

04 Read input Registers Read content of read only location ( 3X )

Read Holding Registers Read content of read /write location ( 4X )

03

Communication Baud Rate is user selectable from the front panel between 4800,9600,19200,38400,57600 bps.

Function code :

8-bit binary, hexadecimal 0-9, A-F

2 hexadecimal characters contained in each 8-bit ﬁeld of the message

4 bytes (32 bits) per parameter.

Floating point format ( to IEEE 754)

Most signiﬁcant byte ﬁrst (Alternative least signiﬁcant byte ﬁrst)

Format of Data Bytes

2 byte Cyclical Redundancy Check (CRC)

Error Checking Bytes

1 start bit,

8 data bits, least signiﬁcant bit sent ﬁrst

1 bit for even/odd parity

1 stop bit if parity is used; 1 or 2 bits if no parity

Byte format

Each byte in RTU mode has following format:

01 Illegal function The function code is not supported by Meter

02 Illegal Data Address Attempt to access an invalid address or an

attempt to read or write part of a ﬂoating point value

03 Illegal DataValue Attempt to set a ﬂoating point variable to an invalid value

Exception Cases : An exception code will be generated when Meter receives ModBus query with valid parity

& error check but which contains some other error ( e.g. Attempt to set ﬂoating point variable to an invalid value)

The response generated will be “Function code” ORed with HEX (80H ). The exception codes are listed below

3.1 Accessing 3X and 4X register for reading measured values:

Two consecutive 16 bit registers represent one parameter. Refer TABLE 1 for the addresses of 3X and 4X

registers used for parameters measured by the instrument. Each parameter is held in the 3X as well as 4X

registers. Modbus Code 04 and 03 are used to access all parameters in 3X and 4X registers respectively.

Example :

To read parameter,

Voltage2 from 3X: Start address = 00 02 Number of registers = 02

Watt2 from 4X: Start address = 00 0E Number of registers = 02

5

Note : Number of registers = Number of parameters x 2

Each Query for reading the data must be restricted to 40 parameters or less. Exceeding the 40 parameter

limit will cause a ModBus exception code to be returned.

Device

Address

Function

Code

Start Address

High

Start Address

Low

Number of

Registers Hi

Number of

Registers Lo

CRC

Low

CRC

High

01 (Hex) 04 (Hex) 00 (Hex) 02(Hex) 00 (Hex) 02(Hex) 30 (Hex) 0A (Hex)

Query for 3X read:

3X Response: Voltage 2 (219.254V)

Device

Address

Function

Code

Byte

Count

Data Register1

High Byte

CRC

High

01 (Hex) 04 (Hex) 04 (Hex) 43 (Hex) 5B (Hex) 41 (Hex) 21 (Hex) 6F (Hex)

Data Register1

Low Byte

Data Register2

High Byte

Data Register2

Low Byte

9B (Hex)

CRC

Low

Byte Count : Total number of data bytes received.

Query for 4X read:

Device

Address

Function

Code

Start Address

High

Start Address

Low

Number of

Registers Hi

Number of

Registers Lo

CRC

Low

CRC

High

01 (Hex) 03 (Hex) 00 (Hex) 0E(Hex) 00 (Hex) 02(Hex) E0 (Hex) C9 (Hex)

4X Response: Watt2 (2000 W)

Device

Address

Function

Code

Byte

Count

Data Register1

High Byte

CRC

High

01 (Hex) 03 (Hex) 04 (Hex) 44 (Hex) FA (Hex) 00 (Hex) 00 (Hex) CE (Hex)

Data Register1

Low Byte

Data Register2

High Byte

Data Register2

Low Byte

F2 (Hex)

CRC

Low

Start Address High : Most signiﬁcant 8 bits of starting address of the parameter requested.

Start Address low : Least signiﬁcant 8 bits of starting address of the parameter requested.

Number of register Hi : Most signiﬁcant 8 bits of Number of registers requested.

Number of register Lo : Least signiﬁcant 8 bits of Number of registers requested.

Data register 1 High Byte : Most signiﬁcant 8 bits of Data register 1 of the parameter requested.

Data register 1 Low Byte : Least signiﬁcant 8 bits of Data register 1 of the parameter requested.

Data register 2 High Byte : Most signiﬁcant 8 bits of Data register 2 of the parameter requested.

Data register 2 Low Byte : Least signiﬁcant 8 bits of Data register 2 of the parameter requested.

(Note : Two consecutive 16 bit register represent one parameter.)

Byte count : No.of Bytes Demanded by user in querry.

6

TABLE 1 : 3 X and 4 X register addresses for measured parameters

Address

(3X)

Address

(4X)

Parameter

Number Parameter

Start Address Hex 3X Start Address Hex 4X

High Byte Low Byte High Byte Low Byte

30001

30003

30005

30007

30009

30011

30013

30015

30017

30019

30021

30023

30025

30027

30029

30031

30033

30035

30037

30039

30041

30043

30045

30047

30049

30051

30053

30055

30057

30059

40001

40003

40005

40007

40009

40011

40013

40015

40017

40019

40021

40023

40025

40027

40029

40031

40033

40035

40037

40039

40041

40043

40045

40047

40049

40051

40053

40055

40057

40059

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

V1

V2

V3

I1

I2

I3

W1

W2

W3

VA1

VA2

VA3

VAR1

VAR2

VAR3

PF1

PF2

PF3

Angle1

Angle2

Angle3

Volt Avg

Volt Sum

Current Avg

Current Sum

Watt Avg

Watt Sum

VA Avg

VA Sum

VAr Avg

00

02

04

06

08

0A

0C

0E

10

12

14

16

18

1A

1C

1E

20

22

24

26

28

2A

2C

2E

30

32

34

36

38

3A

00

02

04

06

08

0A

0C

0E

10

12

14

16

18

1A

1C

1E

20

22

24

26

28

2A

2C

2E

30

32

34

36

38

3A

7

TABLE 1 : Continued...

Address

(3X)

Address

(4X)

Parameter

Number Parameter

Start Address Hex 3X Start Address Hex 4X

High Byte Low Byte High Byte Low Byte

30061

30063

30065

30067

30069

30071

30073

30075

30077

30079

30081

30085

30087

30089

30091

30093

30095

30097

30099

30101

30103

30105

30107

30109

30111

30113

30115

30117

30119

30121

40061

40063

40065

40067

40069

40071

40073

40075

40077

40079

40081

40085

40087

40089

40091

40093

40095

40097

40099

40101

40103

40105

40107

40109

40111

40113

40115

40117

40119

40121

31

32

33

34

35

36

37

38

39

40

41

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

VAr Sum

PF Avg

PF Sum

Phase Angle Avg

Phase Angle Sum

Freq

Wh import

Wh export

VArh Capacitive

VArh Inductive

VAh

kW imp demand

max kW imp demand

kW exp demand

max kW exp demand

kVAr Cap. demand

max kVAr Cap. demand

kVAr Ind. demand

max kVAr Ind. demand

KVA demand

max KVA demand

current demand

max current demand

Wh import Overﬂow count

Wh Import

Wh export Overﬂow count

Wh export

VArh Cap. Overﬂow count

VArh Capacitive

VArh Ind. Overﬂow count

00

3C

3E

40

42

44

46

48

4A

4C

4E

50

54

56

58

5A

5C

5E

60

62

64

66

68

6A

6C

6E

70

72

74

76

78

00

3C

3E

40

42

44

46

48

4A

4C

4E

50

54

56

58

5A

5C

5E

60

62

64

66

68

6A

6C

6E

70

72

74

76

78

8

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