ETRA SOM/ETRA Evaluation Kit/Interfaces and Connectors/UARTs

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History
Issue Date Notes

2021/01/14

First Release
2023/08/30 UARTs Linux device updated info


UARTs interface[edit | edit source]

Description[edit | edit source]

The UART interfaces are available on the Evaluation Kit at the connectors J9 and J10.

J9 and J10 are 3 pin terminal blocks 5.0mm pitch respectively for USART3 and UART8. Can be independently used as RS232 or RS485 based on Part Number composition.


UARTs connector

Signals[edit | edit source]

The following table describes the interface signals:

J9[edit | edit source]

Pin# SOM Pin# RS232 RS485 Pin Notes
1 J18.89 USART3_TX RS485_A
2 J18.91 USART3_RX RS485_B
3 - Ground Ground

J10[edit | edit source]

Pin# SOM Pin# RS232 RS485 Pin Notes
1 J18.191 UART8_TX RS485_A
2 J18.193 UART8_RX RS485_B
3 - Ground Ground

Device mapping[edit | edit source]

USART3 is mapped to /dev/ttySTM1 device in Linux.

UART8 is mapped to /dev/ttySTM2 device in Linux.

Device usage[edit | edit source]

Fix the signal cables to the terminal with a small flat screwdriver.