
Because of this we need to use a male to male gender changer combined with a female to male null modem cable. Male to male null modem cables are really hard to find. These instructions are for the more popular DCE adapter but the tradeoff is that we need use a RS232 gender changer with it. Ready made DTE adapters do exist but the prices are a lot higher and the availability is bad. Because of this they have a female DB9 connector.Īs we want to control a another device with the microcontroller the ESP32 need to act as the data terminal equipment (DTE). Most of these adapters are also designed for DCE use meaning they are normally used together with device that is being controlled. Many of them are built using a chinese clone of the MAX3232 chip. Online DemoĬheap TTL to RS232 adapters are widely available for a few dollars. A big thank you for DCX Link for creating the video.
