HXAD RS232 TO RS485 Passive Interface Adapter Converter

HXAD RS232 TO RS485 Passive Interface Adapter Converter Documentation

Overview

The HXAD RS232 TO RS485 Passive Interface Adapter Converter is a compact, cost-effective solution for converting RS232 signals to RS485 signals. This adapter is designed to transmit data over long distances, making it an ideal choice for industrial automation, building automation, and other IoT applications.

Features

Passive conversion, no external power supply required
 Bi-directional conversion, supports full-duplex communication
 Supports data rates up to 115.2 kbps
 Compact design, easy to integrate into existing systems
 Screw terminal connections for easy installation

Pinout

The HXAD RS232 TO RS485 Passive Interface Adapter Converter has a 9-pin D-Subminiature connector for RS232 input and a 4-position screw terminal for RS485 output. The pinout is as follows:

RS232 Input (9-pin D-Subminiature):

Pin 1: RX (Receive)
 Pin 2: TX (Transmit)
 Pin 3: RTS (Request to Send)
 Pin 4: CTS (Clear to Send)
 Pin 5: GND (Ground)
 Pin 6: DSR (Data Set Ready)
 Pin 7: DTR (Data Terminal Ready)
 Pin 8: RI (Ring Indicator)
 Pin 9: NC (Not Connected)

RS485 Output (4-position screw terminal):

Terminal 1: A+ (Non-Inverting Output)
 Terminal 2: B- (Inverting Output)
 Terminal 3: GND (Ground)
 Terminal 4: NC (Not Connected)

Code Examples

### Example 1: Arduino RS232 to RS485 Serial Communication

In this example, we will demonstrate how to use the HXAD RS232 TO RS485 Passive Interface Adapter Converter to communicate between an Arduino board and an RS485 device.

Hardware Requirements

Arduino Uno board
 HXAD RS232 TO RS485 Passive Interface Adapter Converter
 RS485 device (e.g., temperature sensor or actuator)

Software Requirements

Arduino IDE

Code
```c
#include <SoftwareSerial.h>

// Define the serial pins for the RS232 connection
#define TX_PIN 1
#define RX_PIN 0

SoftwareSerial rs232Serial(TX_PIN, RX_PIN);

void setup() {
  // Initialize the serial connection
  rs232Serial.begin(9600);
}

void loop() {
  // Send a string to the RS485 device
  rs232Serial.println("Hello, RS485!");
  
  // Wait for a response from the RS485 device
  while (rs232Serial.available() == 0);
  String response = rs232Serial.readStringUntil('
');
  Serial.println(response);
  delay(1000);
}
```
In this example, we use the SoftwareSerial library to establish a serial connection between the Arduino board and the HXAD RS232 TO RS485 Passive Interface Adapter Converter. We then send a string to the RS485 device and wait for a response.

### Example 2: Python RS232 to RS485 Serial Communication using PySerial

In this example, we will demonstrate how to use the HXAD RS232 TO RS485 Passive Interface Adapter Converter to communicate between a Python script and an RS485 device.

Hardware Requirements

Computer with RS232 port (e.g., USB-to-RS232 adapter)
 HXAD RS232 TO RS485 Passive Interface Adapter Converter
 RS485 device (e.g., temperature sensor or actuator)

Software Requirements

Python 3.x
 PySerial library

Code
```python
import serial

# Open the serial connection
ser = serial.Serial('COM1', 9600, timeout=1)

while True:
  # Send a string to the RS485 device
  ser.write(b'Hello, RS485!
')
  
  # Wait for a response from the RS485 device
  response = ser.readline()
  print(response.decode('utf-8'))
  time.sleep(1)
```
In this example, we use the PySerial library to establish a serial connection between the computer and the HXAD RS232 TO RS485 Passive Interface Adapter Converter. We then send a string to the RS485 device and wait for a response.

Note: The above examples assume that the RS485 device is properly configured and connected to the HXAD RS232 TO RS485 Passive Interface Adapter Converter. Please consult the documentation of your specific RS485 device for configuration and connection details.