Managing the driver enable signal for RS-485 and IO-link communications with the STM32's USART

RS-485 and IO-Link are half-duplex communication protocols that offer easy ways of implementing the physical layer in industrial networks.

The STM32F10x, which comes with up to 5 UART interfaces and features fast DMA transfer and low interrupt latency, meets the RS-485 and IO-Link timing specifications. This application note aims at providing timing measurements of the DE signal (Driver Enable) switching by using two different methods for managing this signal in RS-485 and IO-Link master transmission.

The application note is organized into three parts: it first explains why the timing of the DE signal is critical; it then describes the two methods used to manage the DE signal; and finally, it gives different measurements of the DE signal switching time.

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