UART-RS232 Transceiver
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Specifications
- Product Name: COM-TTL-RS232
- Interface: UART – RS232 Transceiver
- Power Supply: +5V
- Compatibility: Arduino, Raspberry Pi
Product Usage Instructions
1. Device Overview
When connecting to other devices, pay attention to the actual
signal direction and do not cross RX and TX connections.
2. Use with an Arduino
Connect the module to your Arduino as shown in the schematic and
table.
- VCC to 5V pin
- TXD to Pin 1 (TX)
- RXD to Pin 0 (RX)
- GND to GND pin
Transfer the provided code example to your Arduino for
communication.
3. Use with a Raspberry Pi
Enable the serial interface on your Raspberry Pi by following
the provided steps.
- VCC to 3.3V pin
- TXD to GPIO 14
- RXD to GPIO 15
- GND to GND pin
Install python-serial and download the prepared code example for
Raspberry Pi.
Frequently Asked Questions (FAQ)
1. What should I do if I encounter unexpected problems during
use?
If you encounter any unexpected problems, please contact us for
assistance.
2. Can I use this product with other microcontrollers?
The product is compatible with Arduino and Raspberry Pi, but
compatibility with other microcontrollers may vary. Check the
specifications before use.
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UART – RS232 TRANSCEIVER
COM-TTL-RS232
1. GENERAL INFORMATION Dear customer, thank you for choosing our product. In the following, we will show you what to do during commissioning and Use must be observed. Should you encounter any unexpected problems during use, please do not hesitate to contact us.
2. DEVICE OVERVIEW
i Please note that the labeling of the RX and TX as well as RXD and TXD connections on the module does not describe the function of the module itself, but that of the respective counterpart to be connected. Therefore, when connecting to other devices, pay attention to the actual signal direction and do not cross RX and TX as would otherwise be the case.
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1 4 5
2 6 7
3
10
NUMBER 1 2
3
4 5
6
7 8 9 10
Function
Ground connection RS232 signal RS232 send connection of the module, connect your
RS232 receive line here RS232 receive connection of the module, connect your
RS232 send line here Ground connection to your controller
TTL transmit line of the module, connect the TTL receive line of your controller here
TTL receive line of the module, connect the TTL transmit line of your controller here
Power supply +
Status LED TTL receive line of the module
Status LED TTL transmit line of the module
Power LED
3. USE WITH AN ARDUINO
PIN
Arduino
VCC
5 V
TXD
Pin 1
RXD
Pin 0
GND
GND
Connect your module to your Arduino as shown in the schematic and the table. You can then transfer the following code example to your Arduino.
String testString; //Declaring a variable void setup() {
Serial.begin(9600); // Activating serial communication } void loop() {
Serial.println(“Please enter Test-String: “); while (Serial.available() == 0) {} // Wait for input testString = Serial.readString(); //Reading out the input Serial.println(“The Test-String received is: ” + testString); Serial.println(“——————————————“); delay(2000); }
Alternatively, you can download the sample code here.
4. USE WITH A RASPBERRY PI
i This guide was written under Raspberry Pi OS
Bookworm for the Raspberry Pi 4 and 5.
No
check was carried out with newer operating systems or hardware.
PIN
Raspberry Pi
VCC
3.3 V
TXD
GPIO 14
RXD
GPIO 15
GND
GND
Installation:
First you need to enable the serial Interface on your Raspberry Pi. To open the configuration, enter the following command: sudo raspi-config Select 3 Interface Options I5 Serial, disable the serial login shell and enable the serial hardware.
Now install python-serial with the following command:
sudo apt-get install python3-serial
Now enter the following command to download the prepared code example:
wget https://joy-it.net/files/files/Produkte/COM-TTL-RS232/COM-TTL-RS232_RPI.zip
Use the following command to unzip and remove the .zip directory:
unzip COM-TTL-RS232.zip && rm COM-TTL-RS232_RPI.zip
You can now start the code example with this command:
python3 COM-TTL-RS232_RPI.py
Alternatively, you can also transfer the sample code manually to your Raspberry Pi.
import serial import time
# Opening the serial port for Pi4 #port = serial.Serial(“/dev/ttyS0”, baudrate=9600, timeout=3.0)
# Opening the serial port for Pi5 port = serial.Serial(“/dev/ttyAMA0”, baudrate=9600, timeout=3.0)
print (“Starting test…”) port.write(bytes(“Please enter Test-String: n”,’ascii’)) # Message is sent while True:
testString = port.readline() # Something is read out testString = testString.decode(‘utf-8′) # Convert to string
if testString != “”: # Output to console print(“The Test-String received is: ” ,testString) print(“———————————————-“) time.sleep(2) port.write(bytes(“Please enter Test-String: n”,’ascii’))
The code example is configured for the Raspberry Pi 5. If you’re using a Raspberry Pi 4, comment out the port settings for Pi 5 and enable the corresponding port settings for Pi 4. Please refer to the comments in the code for guidance.
5. OTHER INFORMATION
Our information and take-back obligations under
the German Electrical and Electronic Equipment Act
(ElektroG)
Symbol on electrical and electronic equipment:
2
This crossed-out garbage can means that electrical and electronic appliances do not belong in household waste. You must hand in the old appliances at a collection point. Before handing them in, you must separate used batteries and accumulators that are not enclosed by the old appliance.
Return options: As an end user, you can hand in your old appliance (which essentially fulfills the same function as the new appliance purchased from us) for disposal free of charge when purchasing a new appliance. Small appliances with no external dimensions greater than 25 cm can be disposed of in normal household quantities regardless of whether you have purchased a new appliance.
Possibility of return at our company location during opening hours: SIMAC Electronics GmbH, Pascalstr. 8, D-47506 Neukirchen-Vluyn
Return option in your area: We will send you a parcel stamp with which you can return the device to us free of charge. To do so, please contact us by e-mail at Service@joy-it.net or by telephone.
Packaging information: Please pack your old appliance securely for transportation. If you do not have suitable packaging material or do not wish to use your own, please contact us and we will send you suitable packaging.
6. SUPPORT
We are also there for you after your purchase. If you still have any questions or problems arise, we are also available by e-mail, telephone and ticket support system.
E-Mail: service@joy-it.net Ticket-System: https://support.joy-it.net Phone: +49 (0)2845 9360 – 50
For further information, please visit our website: www.joy-it.net
Published: 2025.05.20
www.joy-it.net SIMAC Electronics GmbH Pascalstr. 8, 47506 Neukirchen-Vluyn
Documents / Resources
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JOY-it UART-RS232 Transceiver [pdf] Instruction Manual COM-TTL-RS232, UART-RS232 Transceiver, UART-RS232, Transceiver |