UNICA SBC/Interfaces and Connectors/UARTs
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Contents
UARTs interface[edit | edit source]
Description[edit | edit source]
J24 connector The UARTs interfaces available on the UNICA SBC are mapped to the following connectors:
J24 is a Phoenix Contact 1707450 MCV 1,5/ 5-G-3,81 3.81mm connector. On this connector, a multiprotocol UART interface can be made available.
- standard mounting provides a 4-wires RS232 serial interface
- optional mounting provides an RS422/RS485 serial interface
Signals[edit | edit source]
The following tables describe the interfaces signals:
J66[edit | edit source]
| Pin# | Pin name | Pin function | Pin Notes |
|---|---|---|---|
| 1 | SMP_P1 | RS232_TX or RS422_485_A | optional RS422/RS485 |
| 2 | SMP_P2 | RS232_RX or RS422_485_Y | optional RS422/RS485 |
| 3 | SMP_P3 | RS232_RTS or RS422_485_B | optional RS422/RS485 |
| 4 | SMP_P4 | RS232_CTS or RS422_485_Z | optional RS422/RS485 |
| 5 | GND | DGND | connected to DGND |
For RS485 half-duplex mode, outputs are RS485_Y and RS485_Z: see THVD1424RGTR datasheet for the RS422 and RS485 transceiver.
Device mapping[edit | edit source]
UARTs are mapped to /dev/ttyxxx device in Linux depending on SoC peripherals and drivers: for example, NXP SoCs map UART devices as /dev/ttymxc<x>
Device usage[edit | edit source]
The RS232 and RS485 use the standard protocols.
