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<?php
declare(strict_types=1);
namespace ModbusTcpClient\Packet\ModbusFunction;
use ModbusTcpClient\Exception\InvalidArgumentException;
use ModbusTcpClient\Packet\ErrorResponse;
use ModbusTcpClient\Packet\ModbusApplicationHeader;
use ModbusTcpClient\Packet\ModbusPacket;
use ModbusTcpClient\Packet\ModbusRequest;
use ModbusTcpClient\Packet\ProtocolDataUnitRequest;
use ModbusTcpClient\Utils\Registers;
use ModbusTcpClient\Utils\Types;
/**
* Request for Write Multiple Registers (FC=16)
*
* Example packet: \x01\x38\x00\x00\x00\x0d\x11\x10\x04\x10\x00\x03\x06\x00\xC8\x00\x82\x87\x01
* \x01\x38 - transaction id
* \x00\x00 - protocol id
* \x00\x0d - number of bytes in the message (PDU = ProtocolDataUnit) to follow
* \x11 - unit id
* \x10 - function code
* \x04\x10 - start address
* \x00\x03 - count of register to write
* \x06 - registers byte count
* \x00\xC8\x00\x82\x87\x01 - registers data
*
*/
class WriteMultipleRegistersRequest extends ProtocolDataUnitRequest implements ModbusRequest
{
/**
* @var string[] registers (array of bytes)
*/
private array $registers;
private int $registersCount;
private int $registersBytesSize;
/**
* @param int $startAddress
* @param string[] $registers
* @param int $unitId
* @param int|null $transactionId
*/
public function __construct(int $startAddress, array $registers, int $unitId = 0, int $transactionId = null)
{
$this->registers = $registers;
$this->registersBytesSize = Registers::getRegisterArrayByteSize($this->registers);
$this->registersCount = $this->registersBytesSize / 2;
parent::__construct($startAddress, $unitId, $transactionId);
$this->validate();
}
public function validate(): void
{
parent::validate();
if ($this->registersCount === 0 || $this->registersCount > 124) {
// as request contain 1 byte field 'registersBytesSize' to indicate number of bytes to follow
// there is no way more than 124 words (124*2 bytes) can be written as this field would overflow
throw new InvalidArgumentException("registers count out of range (1-124): {$this->registersCount}", 3);
}
}
public function getFunctionCode(): int
{
return ModbusPacket::WRITE_MULTIPLE_REGISTERS;
}
public function __toString(): string
{
return parent::__toString()
. Types::toRegister($this->registersCount)
. Types::toByte($this->registersBytesSize)
. Registers::getRegisterArrayAsByteString($this->registers);
}
/**
* @return string[]
*/
public function getRegisters(): array
{
return $this->registers;
}
protected function getLengthInternal(): int
{
// (function code size (1) + startAddress size (2)) + registers count size (2) + register byte size (1) + number of bytes registers need for data
return parent::getLengthInternal() + (3 + $this->registersBytesSize);
}
/**
* Parses binary string to WriteMultipleRegistersRequest or return ErrorResponse on failure
*
* @param string $binaryString
* @return WriteMultipleRegistersRequest|ErrorResponse
*/
public static function parse(string $binaryString): ErrorResponse|WriteMultipleRegistersRequest
{
return self::parseStartAddressPacket(
$binaryString,
15,
ModbusPacket::WRITE_MULTIPLE_REGISTERS,
function (int $transactionId, int $unitId, int $startAddress) use ($binaryString) {
$quantity = Types::parseUInt16($binaryString[10] . $binaryString[11]);
$byteCount = Types::parseByte($binaryString[12]);
$registers = str_split(substr($binaryString, 13, $byteCount), 2);
if ($quantity !== count($registers)) {
return new ErrorResponse(
new ModbusApplicationHeader(2, $unitId, $transactionId),
ModbusPacket::WRITE_MULTIPLE_REGISTERS,
3 // Illegal data value
);
}
return new self($startAddress, $registers, $unitId, $transactionId);
}
);
}
}
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