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To use ORSSerialPort with Arduino, follow these steps:

1. First, download and install the ORSSerialPort library on your Mac. You can download the library from the official GitHub page.

2. Connect your Arduino board to your Mac using a USB cable.

3. Open the Arduino IDE and select the board and port from the Tools menu.

4. Open Xcode and create a new project. Choose "Application" from the template selection screen.

5. Add the ORSSerialPort library to your project by going to the "Build Phases" tab and clicking the "+" button to add a new "Link Binary with Libraries" build phase. Select the ORSSerialPort.framework from the list of available libraries.

6. Add the necessary code to your Xcode project to communicate with the Arduino board. Here is a sample code snippet that demonstrates how to connect to the Arduino board and send data to it:

import Cocoa
import ORSSerial

class ViewController: NSViewController, ORSSerialPortDelegate {

    var serialPort : ORSSerialPort?

    override func viewDidLoad() {
        super.viewDidLoad()

        // Find the serial port that the Arduino is connected to
        let availablePorts = ORSSerialPortManager.shared().availablePorts
        for port in availablePorts {
            if port.name.contains("usbserial") {
                serialPort = port
                serialPort?.baudRate = 9600
                serialPort?.delegate = self
            }
        }
        if (serialPort == nil) {
            print("Could not find the serial port!")
            return
        }

        // Open the serial port
        serialPort!.open()
    }

    // Send data to the Arduino when the user clicks the "Send" button
    @IBAction func sendButtonClicked(sender: NSButton) {
        let data = "Hello Arduino!".data(using: String.Encoding.utf8)!
        serialPort!.send(data)
    }

    // Receive data from the Arduino
    func serialPort(_ serialPort: ORSSerialPort, didReceive data: Data) {
        print("Received: \(data)")
    }

    // Handle errors that occur in the serial port connection
    func serialPort(_ serialPort: ORSSerialPort, didEncounterError error: Error) {
        print("Error: \(error.localizedDescription)")
    }
}

This code connects to the first available serial port that contains the string "usbserial" in its name. You may need to modify this code if your Arduino is connected to a different serial port.

1. Compile and run your Xcode project. If everything is set up correctly, you should be able to send commands to the Arduino from your Mac and receive data back from it.