Lumel ND25 User Manual

Reading Parameter data through User Assignable Registers:
In assigning query Voltage 2 & Power Factor 1 parameters were assigned to 0x251C & 0x251D (TABLE
15) which will point to user assignable 3x registers 0x400 and 0x402 (TABLE 14). So to read Voltage2 and
Power Factor1 data reading query should be as below.
Query:
Device Address
Function Code
Start Address High
Start Address Low
Number of Registers Hi
01 (Hex)
04 (Hex)
04(Hex)
00 (Hex)
00 (Hex)
Start Address High : Most significant 8 bits of
starting address of Userassignable register.
Start Address low :Least significant 8 bits of
starting address of User assignable register.
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.
**Note : Two consecutive 16 bit register
represent one parameter. Since two
parameters are requested four registers are
required
Number of Registers Lo
CRC Low
CRC High
04 (Hex)**
F0 (Hex)
71 (Hex)
00 (Hex)
00 (Hex)
79 (Hex)
3F (Hex)
3F (Hex)
01 (Hex)
04 (Hex)
08 (Hex)
43 (Hex)
5B (Hex)
4E (Hex)
04 (Hex)
80 (Hex)
Data Register-4 Low Byte
Device Address
Function Code
Byte count
CRC High
CRC Low
Data Register-3 Low Byte
Data Register-4 High Byte
Data Register-3 High Byte
}
Voltage
2 Data
Power
Factor 1
Data
Data Register-2 Low Byte
Data Register-1 Low Byte
Data Register-2 High Byte
Data Register-1High Byte
}
Response : (Volt2 = 219.30 / Power Factor1 = 1.0)
45

Lumel ND25 Specifications

General

Brand	Lumel
Model	ND25
Category	Measuring Instruments
Language	English