The converter is based on the popular MAX3232 chip, which connects the RS232 and UART serial interface with the TTL voltage standard. The module has a D-SUB connector and a goldpin header connector with 2.54 pitch is soldered on the board. Technical data A 4-pin pin connector for connection to a digital system 9-pin female D-SUB9, e.g. for connection to a personal computer chip used: MAX3232 supply voltage range: 3-5.5V LED indicating power maximum data transmission rate: 250kbit / s Application examples: communication with alarm control panels, GSM modules, telephones, etc. enabling communication via RS232 / TTL serial link reading data from the above-mentioned devices or other. communication with DVD, routers communication with 8051, AVR, STM32 microcontrollers, others powered from 5V or 3.3V via serial port RS232 connector: DB9 female The MAX 3232 chip used Supply voltage: 3.3 - 5V TX RX voltage: 3.3 - 5V Derived signals: RX, TX, GND, Vcc LED indicating power Compatible with ARDUINO modules https://elecena.pl/product/22610327/rs232-ttl-max3232-d-sub-to-ttl-uart-converter-db9-socket 2023-02-22 https://elecena.pl/product/22610327/rs232-ttl-max3232-d-sub-to-ttl-uart-converter-db9-socket 2023-12-05 https://elecena.pl/product/22610327/rs232-ttl-max3232-d-sub-to-ttl-uart-converter-db9-socket 2025-10-25 https://elecena.pl/product/22610327/rs232-ttl-max3232-d-sub-to-ttl-uart-converter-db9-socket 2025-10-29