CEL-MAR ADA-4040PC3, Руководство пользователя

Страница: 15 / 20

The registers with the measurement value are in the integer format of 32-bit sign (in C/C++ type int).
The actual measurement value is obtained from the read register using the following algorithms, using the appropriate factor value DW
(see table above)
Algorithm 1. Readout register is saved to regular type variable (float) and then divide it by the factor DW .
// Fragment of code in C language (VS6.0) presenting above algorithm
int
iMeasurementReg;
float fMeasurmentValue
......
fMeasurmentValue = (float)iMeasurementRegister;
fMeasurmentValue = fMeasurmentValue /
DW ;
Algorithm 2. Readout register is saved to regular type variable 32-bit (int) and then divide by the factor DW , received change of the
dividing it is a number of the hundredth parts of the measurement value.
// Fragment of code in C language (VS6.0) presenting above algorithm
int
iMeasurementReg;
div_t div_MeasurmentValue;
......
div_MeasurmentValue = div((int)iMeasurementRegister,
DW )
printf( "Total measurement value = %d\n, hundredth parts of the measurement value = %d\n",
div_MeasurmentValue.quot, div_MeasurmentValue.rem );
Query of register Eac
Byte no Designation Size Value [hex]
00 Inverter address 1 byte 11 [ 11 to F7]
01 Function code 1 byte 03 / 04
02 Registry address Hi 1 byte 00
03 Registry address Lo 1 byte 08
04 Registry number Hi 1 byte 00
05 Registry number Lo 1 byte 02
06 CRC-Lo 1 byte ---
07 CRC-Hi 1 byte ---
Example. Query of AC network energy meter Eac from registry address 40009 / address 30009
11-03-00-08-00-02-CRCLo-CRCHi
11-04-00-08-00-02-CRCLo-CRCHi
Response with register value Eac
Byte no Designation Size Value [hex]
00 Inverter address 1-byte 11 [ 11 to F7]
01 Function code 1-byte 03 / 04
02 Number of data bytes N-byte 04
03 Dane1-Hi 1-byte 00
04 Dane1-Lo 1-byte 00
05 Dane2-Hi 1-byte 0B
06 Dane2-Lo 1-byte 90
07 CRC-Lo 1-byte ---
08 CRC-Hi 1-byte ---
Example. Readout of AC network energy meter Eac from registry address 40009 / address 30009
11-03-04-00-00-0B-90-CRCLo-CRCHi
11-04-04-00-00-0B-90-CRCLo-CRCHi
In respond the value of AC network energy meter Eac is presented as 4-byte with values:
Eac = 0x00000B90 => 2960/100 => 29,60 kWh
Response - in case of error
Byte no Designation Size Value [hex]
00 Inverter address 1-byte 11 [ 11 do F7]
15
ADA-4040PC3