Entes MPR-63 Mains-analysis device, Mains analyser MPR-63 User Manual
Product codes
MPR-63
Single register writing command (06) is used to set the transformer ratios or clear any of min., max. or demand
values. Current transformer ratio can be entered between 1 and 5000 and voltage transformer ratio can be
entered between 1 and 4000. Only “0” (zero) value can be entered to the demand values.
For setting the CT ratio as 100;
For setting the CT ratio as 100;
01 Device address
06 Function
01 MSB address
00 LSB address
00 Data MSB
64 Data LSB
89 CRC MSB
DD CRC LSB
Multiple register writing command (10H) is used to change more than one register value. For setting the CT ratio
as 100 and voltage transformer ratio as 2;
RESPONSE
01 Device address
01 Device address
10 Function
10 Function
01 MSB address
01 Register address (high)
00 LSB address
00 Register address (low)
00 Register number MSB
00 Number of registers (high)
02 Register number LSB
02 Number of registers (low)
04 Byte number
40 CRC (high)
00 Data MSB
34 CRC (low)
64 Data LSB
00 Data MSB
C8 Data LSB
BE CRC MSB
76 CRC LSB
Register Readýng (03H) function is used to read measured parameters and transformer ratios. If a register is
tried to read except for values, device sends error message. .
Example : This message must be sent to the device for reading the phase-neutral voltage of Phase 1;
01 Device address
03 Function
00 MSB address
00 LSB address
00 Register numbers MSB
01 Register numbers LSB
84 CRC MSB
0A CRC LSB
03H
REGISTER READING
06H
SINGLE REGISTER WRITING
10H
MULTIPLE REGISTER WRITING
3.1 Modbus Functions:
14H
2BH
3. MODBUS RTU PROTOCOL
MODBUS RTU PROTOCOL
Standard message format of MODBUS RTU is as below :
Starting and finishing of T times, which are as much as 3.5 characters time, are time periods of data lines which
must be constant for evaluating by devices at the line if the message starts or finishes.
Address area, which is between 1 and 247, shows the serial address of device at the line.
Data area contains the data which is sent to device from slave to master or from master to slave.
CRC is a determination methode of error which is used at the MODBUS RTU Protocol and it has 2 bytes
T
ADDRESS
8 BITS
FUNCTION
8 BITS
DATA
N x 8 BITS
CRCH
CRCL
T
Parameters are transmitted as 16 bit hexadecimal.
For example:
230,6 V voltage value of the device is received as 2306 (0902H) and real value is obtained by multiplying
to its multiplier (x0,1) and VT ratio
1,907A current value is received as 1907 (0773H) and it is multiplyed by 0,001 and CT ratio
-0,78 P.F. value is received as FCF4H. (16 bit signed integer)
Energy values are sent as 2 words in 16 bit register table.
Energy value = (High x 10.000) + Low
Example :
Low
High
06237819 kWh = 1E8BH 026FH
10
LOG DATA RECORD READING
DEVICE INFORMATION READING