Reading Registers (Function Code $03 / $04) - Algodue ELETTRONICA UPM209 Manual Del Usuario

• in RTU mode: 29 registers
• in ASCII mode: 13 registers
• in TCP mode: 1 register
NOTE. The register values are in hex format ($).
NOTE. The following registers describe all parameters for any instrument configuration. Refer
to the instrument model before sending reading/writing commands: some register parameters
may not be available.
TABLE HEADER
Parameter
Register description
F. code (Hex)
Sign
INTEGER
IEEE
Register (Hex)
Words
M.U.
Data meaning
Programmable data

4.1 READING REGISTERS (FUNCTION CODE $03 / $04)

REAL TIME VALUES
V1 • Phase 1-N voltage
V2 • Phase 2-N voltage
V3 • Phase 3-N voltage
V12 • Line 12 voltage
V23 • Line 23 voltage
MODBUS RTU/ASCII, TCP
MEANING
Measuring parameter to be read
Description of the register to be read / written
Function code in hex format. It identifies the command type (reading / writing)
If this column is checked, the read register value can have positive or negative sign.
The value conversion changes according to the instrument model.
SIGN BIT
Convert a signed register value as shown
in the following instructions:
The Most Significant Bit (MSB) indica-
tes the sign as follows: 0=positive (+),
1=negative (-).
N :
egative value example
MSB
$8020 = 1000000000100000 = -32
HEX BIN
Details for INTEGER type registers
Details for IEEE standard type registers
Register address in hex format
Number of word to be read / written for the register (length)
Measuring unit of parameter
Description of data received by a response of a reading command
Description of data which can be sent for a writing command
03 / 04
03 / 04
03 / 04
03 / 04
03 / 04
2'S COMPLEMENT
The negative values are represented with
2's complement.
DEC
0000 2
0002 2
0004 2
0006 2
0008 2
mV 1000 2
mV 1002 2
mV 1004 2
mV 1006 2
mV 1008 2
V
V
V
V
V
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