Modbus TCP and UDP library for PHP., originally from code.google.com/p/phpmodbus
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php-modbus/tests/ModbusMaster/Fc1ReadCoilsTest.php

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<?php
namespace Tests\ModbusMaster;
use PHPModbus\ModbusMaster;
class Fc1ReadCoilsTest extends MockServerTestCase
{
public function testFc1Read1Coil()
{
$mockResponse = '89130000000400010101'; // respond with 1 byte (00000001 bits set) [1]
$clientData = static::executeWithMockServer($mockResponse, function ($port) {
$modbus = new ModbusMaster('127.0.0.1', 'TCP');
$modbus->port = $port;
$this->assertEquals([1], $modbus->readCoils(0, 256, 1));
});
$packetWithoutTransactionId = substr($clientData[0], 4);
$this->assertEquals('00000006000101000001', $packetWithoutTransactionId);
}
public function testFc1Read3Coils()
{
$mockResponse = '31be0000000400010103'; // respond with 1 byte (00000011 bits set) [1, 1, 0]
$clientData = static::executeWithMockServer($mockResponse, function ($port) {
$modbus = new ModbusMaster('127.0.0.1', 'TCP');
$modbus->port = $port;
$this->assertEquals([1, 1, 0], $modbus->fc1(0, 256, 3));
});
$packetWithoutTransactionId = substr($clientData[0], 4);
$this->assertEquals('00000006000101000003', $packetWithoutTransactionId);
}
}