USB 2.0 to TTL RS485 Serial Converter Adapter FTDI Module (FT232FRL SN75176) Documentation

Component Description

USB 2.0 to TTL RS485 Serial Converter Adapter FTDI Module (FT232FRL + SN75176)

Overview

The USB 2.0 to TTL RS485 Serial Converter Adapter FTDI Module is a compact, high-performance module that enables bi-directional communication between a USB-enabled device and a TTL RS485 serial device. The module is based on the popular FTDI FT232FRL USB-to-TTL serial converter and the Texas Instruments SN75176 RS485 transceiver, making it an ideal solution for industrial automation, remote monitoring, and IoT applications.

Functionality

The module functions as a USB-to-TTL RS485 serial converter, allowing users to connect a TTL RS485 device to a USB-enabled host device, such as a computer or laptop. The module receives USB data from the host device and converts it to TTL RS485 signals, which are then transmitted to the TTL RS485 device. Conversely, the module converts received TTL RS485 signals from the device to USB data, which is then transmitted back to the host device.

Key Features

USB 2.0 Interface: The module features a USB 2.0 interface, providing a high-speed connection to the host device with data transfer rates up to 480 Mbps.
FTDI FT232FRL: The module is based on the FTDI FT232FRL, a popular and widely-used USB-to-TTL serial converter chip. This ensures compatibility with a wide range of operating systems, including Windows, macOS, and Linux.
SN75176 RS485 Transceiver: The module incorporates the Texas Instruments SN75176 RS485 transceiver, which provides a robust and reliable conversion of TTL signals to RS485 signals.
TTL RS485 Interface: The module features a 9-pin D-subminiature connector, providing a convenient interface for connecting to TTL RS485 devices.
Half-Duplex and Full-Duplex Operation: The module supports both half-duplex and full-duplex operation, allowing for flexible configuration to suit specific application requirements.
Auto-Direction Control: The module features auto-direction control, eliminating the need for external direction control signals.
LED Indicators: The module includes LED indicators for power, transmit, and receive signals, providing visual feedback for troubleshooting and debugging.
Compact Size: The module is compact and lightweight, making it suitable for use in a variety of applications where space is limited.
Operating Temperature Range: The module operates over a wide temperature range of -40C to +85C, ensuring reliable performance in harsh environments.
RoHS Compliant: The module is RoHS (Restriction of Hazardous Substances) compliant, ensuring environmental sustainability and regulatory compliance.

Applications

The USB 2.0 to TTL RS485 Serial Converter Adapter FTDI Module is suitable for a wide range of applications, including

Industrial automation and control systems

Remote monitoring and data acquisition systems

IoT devices and sensor networks

Building automation and control systems

Medical devices and equipment

Aerospace and defense applications

Technical Specifications

| Parameter | Value |

| --- | --- |

| USB Interface | USB 2.0 |

| Data Transfer Rate | Up to 480 Mbps |

| TTL RS485 Interface | 9-pin D-subminiature connector |

| Operating Temperature Range | -40C to +85C |

| Power Supply | 5V 10% |

| Current Consumption | Typical

100mA, Maximum: 150mA |

| Dimensions | 45mm x 25mm x 15mm |

| Weight | Approximately 20g |

Certifications and Compliance

RoHS (Restriction of Hazardous Substances) compliant

CE (Conformit Europene) certified

FCC (Federal Communications Commission) compliant

Pin Configuration

USB 2.0 to TTL RS485 Serial Converter Adapter FTDI Module (FT232FRL SN75176) Pinout Explanation
The USB 2.0 to TTL RS485 Serial Converter Adapter FTDI Module (FT232FRL SN75176) is a versatile and compact module that enables communication between a USB host device and RS485 devices. This module utilizes the FTDI FT232FRL chip and Texas Instruments SN75176 transceiver to provide a reliable and efficient serial communication interface. Below is a detailed explanation of the module's pins:
USB Interface Pins:
1. VCC (1): +5V power input from the USB host device. This pin should be connected to the 5V power supply of the USB host.
2. D- (2): USB data negative signal. This pin should be connected to the D- signal of the USB host device.
3. D+ (3): USB data positive signal. This pin should be connected to the D+ signal of the USB host device.
4. GND (4): Ground connection. This pin should be connected to the ground of the USB host device.
RS485 Interface Pins:
5. A (5): Non-inverting output of the RS485 transceiver (SN75176). This pin should be connected to the A line of the RS485 bus.
6. B (6): Inverting output of the RS485 transceiver (SN75176). This pin should be connected to the B line of the RS485 bus.
TTL Serial Interface Pins:
7. RX (7): Receive data input from the TTL serial interface. This pin should be connected to the transmit (TX) pin of the microcontroller or other TTL serial devices.
8. TX (8): Transmit data output from the TTL serial interface. This pin should be connected to the receive (RX) pin of the microcontroller or other TTL serial devices.
9. GND (9): Ground connection. This pin should be connected to the ground of the microcontroller or other TTL serial devices.
Additional Pins:
10. VCC_IO (10): +3.3V power output from the FT232FRL chip. This pin can be used as a power source for external devices, but ensure not to exceed the maximum current rating.
11. RTS (11): Request to Send output from the FT232FRL chip. This pin can be used to control the flow of data transmission.
12. CTS (12): Clear to Send input to the FT232FRL chip. This pin should be connected to the RTS pin of the receiving device.
Pin Connection Structure:
To connect the module to a USB host device and an RS485 device, follow these steps:
1. Connect the USB interface pins (VCC, D-, D+, and GND) to the corresponding pins on the USB host device.
2. Connect the RS485 interface pins (A and B) to the corresponding pins on the RS485 device.
3. Connect the TTL serial interface pins (RX and TX) to the corresponding pins on the microcontroller or other TTL serial devices. Ensure that the RX pin of the module is connected to the TX pin of the microcontroller, and the TX pin of the module is connected to the RX pin of the microcontroller.
4. Connect the ground pin (GND) of the module to the ground of the microcontroller or other TTL serial devices.
5. If necessary, connect the VCC_IO pin to an external power source or device, ensuring not to exceed the maximum current rating.
6. If required, connect the RTS and CTS pins to the corresponding pins on the receiving device to control the flow of data transmission.
Important Notes:
Ensure proper voltage levels and signal integrity when connecting the module to external devices.
Use appropriate pull-up or pull-down resistors, if necessary, to prevent voltage fluctuations and signal degradation.
Consult the datasheets of the FT232FRL and SN75176 chips for more detailed information on their operation and specifications.

Code Examples

USB 2.0 to TTL RS485 Serial Converter Adapter FTDI Module (FT232FRL SN75176) Documentation

Overview

The USB 2.0 to TTL RS485 Serial Converter Adapter FTDI Module (FT232FRL SN75176) is a versatile module that enables communication between a USB host and a TTL RS485 serial device. It is based on the FTDI FT232R USB-to-serial chip and the SN75176 RS485 transceiver. This module is suitable for a wide range of applications, including industrial automation, robotics, and IoT projects.

Features

USB 2.0 interface with data transfer rates up to 12 Mbps
 TTL RS485 serial interface with data transfer rates up to 10 Mbps
 FTDI FT232R USB-to-serial chip
 SN75176 RS485 transceiver
 3.3V and 5V compatible
 Supports Windows, macOS, and Linux operating systems
 Compact and rugged design

Pinout

The module has a 6-pin header with the following pinout:

| Pin | Function |
| --- | --- |
| 1 | VCC (3.3V or 5V) |
| 2 | GND |
| 3 | RXD (TTL RS485 receive data) |
| 4 | TXD (TTL RS485 transmit data) |
| 5 | RTS (Request to Send) |
| 6 | CTS (Clear to Send) |

Code Examples

### Example 1: Python Serial Communication using PySerial

This example demonstrates how to use the USB 2.0 to TTL RS485 Serial Converter Adapter FTDI Module with a Python script to communicate with a TTL RS485 device.

Hardware Requirements:

USB 2.0 to TTL RS485 Serial Converter Adapter FTDI Module (FT232FRL SN75176)
 TTL RS485 device (e.g., Arduino board with TTL RS485 shield)
 USB cable

Software Requirements:

Python 3.x
 PySerial library (install using `pip install pyserial`)

Code:
```python
import serial

# Open the serial port
ser = serial.Serial('FT232R', 9600, timeout=1)

# Send a string to the TTL RS485 device
ser.write(b'Hello, RS485!')

# Receive data from the TTL RS485 device
response = ser.readline()
print(response.decode())

# Close the serial port
ser.close()
```
### Example 2: C++ Serial Communication using FTDI D2XX Driver

This example demonstrates how to use the USB 2.0 to TTL RS485 Serial Converter Adapter FTDI Module with a C++ program to communicate with a TTL RS485 device using the FTDI D2XX driver.

Hardware Requirements:

USB 2.0 to TTL RS485 Serial Converter Adapter FTDI Module (FT232FRL SN75176)
 TTL RS485 device (e.g., Arduino board with TTL RS485 shield)
 USB cable

Software Requirements:

C++ compiler (e.g., GCC)
 FTDI D2XX driver (download from FTDI website)

Code:
```c
#include <iostream>
#include <string>
#include "ftd2xx.h"

int main() {
  // Open the FTDI device
  FT_HANDLE ftHandle;
  FT_Open(0, &ftHandle);

// Set the baud rate and data bits
  FT_SetBaudRate(ftHandle, 9600);
  FT_SetDataCharacteristics(ftHandle, FT_BITS_8, FT_STOP_BITS_1, FT_PARITY_NONE);

// Send a string to the TTL RS485 device
  char sendData[] = "Hello, RS485!";
  FT_Write(ftHandle, (LPVOID)sendData, sizeof(sendData), &bytesWritten);

// Receive data from the TTL RS485 device
  char receiveData[256];
  FT_Read(ftHandle, receiveData, 256, &bytesRead);
  std::cout << "Received: " << receiveData << std::endl;

// Close the FTDI device
  FT_Close(ftHandle);

return 0;
}
```
Note: These examples are for illustration purposes only and may require modifications to work with your specific TTL RS485 device and application.

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USB 2.0 to TTL RS485 Serial Converter Adapter FTDI Module (FT232FRL SN75176)

Component Description

Note

Pin Configuration

Code Examples