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64 lines
1.7 KiB
64 lines
1.7 KiB
<?php
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/**
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* Phpmodbus Copyright (c) 2004, 2013 Jan Krakora
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*
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* This source file is subject to the "PhpModbus license" that is bundled
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* with this package in the file license.txt.
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*
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* @copyright Copyright (c) 2004, 2013 Jan Krakora
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* @license PhpModbus license
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* @category Phpmodbus
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* @tutorial Phpmodbus.pkg
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* @package Phpmodbus
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* @version $id$
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*/
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namespace PHPModbus\Packet;
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use PHPModbus\IecType;
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class ReadInputDiscretesPacket
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{
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/**
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* FC2 packet builder - read coils
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*
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* @param int $unitId
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* @param int $reference
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* @param int $quantity
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* @return string
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*/
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public static function build($unitId, $reference, $quantity)
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{
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$dataLen = 0;
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// build data section
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$buffer1 = '';
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// build body
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$buffer2 = '';
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$buffer2 .= IecType::iecBYTE(2); // FC 2 = 2(0x02)
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// build body - read section
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$buffer2 .= IecType::iecINT($reference); // refnumber = 12288
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$buffer2 .= IecType::iecINT($quantity); // quantity
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$dataLen += 5;
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// build header
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$buffer3 = '';
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$buffer3 .= IecType::iecINT(mt_rand(0, 65000)); // transaction ID
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$buffer3 .= IecType::iecINT(0); // protocol ID
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$buffer3 .= IecType::iecINT($dataLen + 1); // lenght
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$buffer3 .= IecType::iecBYTE($unitId); //unit ID
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return $buffer3 . $buffer2 . $buffer1;
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}
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/**
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* FC 2 response parser, alias to FC 1 parser i.e. readCoilsParser.
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*
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* @param string $packet
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* @param int $quantity
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* @return bool[]
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* @throws \Exception
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*/
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public static function parse($packet, $quantity)
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{
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return ReadCoilsPacket::parse($packet, $quantity);
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}
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} |