AOM-3841 UART RS232（DEBUG、COM1、COM2、M.2 E1）
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UART
User Debian/Linux UART/serial port access is through the tty-devices. The ttydevices have different names depending on UART drivers for different boards.
| Device Node | COM Port Name |
| /dev/ttyFIQ0 | Debug |
| /dev/ttyS2 | COM2(RS232 2-wire) |
| /dev/ttyS4 | COM1(RS232 4-wire) |
| /dev/ttyS10 | M.2_E1(UART) |
DEBUG Port Connection
1.Connect the debug port cable on AOM-DB3500.
2.Connect it to your PC with a USB to COM Cable.
| DEBUG Pin Connector | |
| Pin | Signal |
| 1 | NC |
| 2 | RX_DEBUG |
| 3 | TX_DEBUG |
| 4 | NC |
| 5 | GND |
| 6 | NC |
| 7 | RTS# |
| 8 | CTS# |
| 9 | NC |