ETRA SOM/ETRA Evaluation Kit/Interfaces and Connectors/UARTs
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| History | |||
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| Issue Date | Notes | ||
| First Release | |||
| 2023/08/30 | UARTs Linux device updated info | ||
Contents
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.
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.
