/**
* 6.3.1 Variable 'Fixed' Data Header
*
* $data[7 - 18]
* |=============================================================================|
* | Ident. Nr. | Manufr. | Version | Medium | Access No. | Status | Signature |
* | 4 Byte (BCD) | 2 Byte | 1 Byte | 1 Byte | 1 Byte | 1 Byte | 2 Byte |
* |=============================================================================|
*
* Ident.Nr [7-10] \x86\x78\x01\x10
* Manufr. [11-12] \x77\x04
* Version [13] \x14
* Medium [14] \x07
* Access No. [15] \xad
* Status [16] \x00
* Signature [17-18] \x00\x00
*/
private function getSlaveInformation()
{
/**
* Identity Number
* Byte [7-10]
* Translate 4 Byte BCD.
* http://en.wikipedia.org/wiki/Binary-coded_decimal
*/
$this->varheader['Id'] .= (($this->dataarray[10] & 0xf0) >> 4) . ($this->dataarray[10] & 0xf);
$this->varheader['Id'] .= (($this->dataarray[9] & 0xf0) >> 4) . ($this->dataarray[9] & 0xf);
$this->varheader['Id'] .= (($this->dataarray[8] & 0xf0) >> 4) . ($this->dataarray[8] & 0xf);
$this->varheader['Id'] .= (($this->dataarray[7] & 0xf0) >> 4) . ($this->dataarray[7] & 0xf);
/**
* Manufacturer
* Byte [11-12]
* Ascii encoding using IEC 61107.
* http://en.wikipedia.org/wiki/Smart_meter
*/
$manByte1PlusByte2 = $this->dataarray[11] + ($this->dataarray[12] << 8);
$this->varheader['Manufacturer'] = chr(($manByte1PlusByte2 >> 10 & 0x1f) + 64) . chr(($manByte1PlusByte2 >> 5 & 0x1f) + 64) . chr(($manByte1PlusByte2 & 0x1f) + 64);
/**
* Version
* Byte [13]
*/
$this->varheader['Version'] = $this->dataarray[13];
/**
* Medium
* Byte [14]
*/
$this->varheader['Medium'] = mbus_utils::getMedium(dechex($this->dataarray[14]));
/**
* Access No.
* Byte [15]
*/
$this->varheader['AccessNumber'] = $this->dataarray[15];
/**
* Status
* Byte [16]
*/
$this->varheader['Status'] = $this->dataarray[16];
/**
* Signature - Reserved For Future
* Byte [17]
*/
$this->varheader['Signature'] = $this->dataarray[17];
return true;
}
