SaMoCon.md

@@ -32,7 +32,16 @@ Connector Connector [NS25-W4P](https://www.tme.eu/cz/details/ns25-w4p/signalove-
 |    3  | VCC |
 |    4  | RxD |
 
-### RS-232
+### Serial line
+It's not the same as TTL console because of control signals. To use all the features of the serial line, USART peripheral must be used (not UART).
+
+Pins:
+- RXD0 (PB0)
+- TXD0 (PB1)
+- CTS0 (PB2)
+- RTS0 (PB3)
+
+#### RS-232
 Connector [NS25-W5P](https://www.tme.eu/cz/details/ns25-w5p/signalove-konektory-raster-2-54mm/ninigi/)
 
 |Pin on PCB | Signal | DB9 | PC Signal | DB25 | DB9 |
@@ -43,7 +52,7 @@ Connector [NS25-W5P](https://www.tme.eu/cz/details/ns25-w5p/signalove-konektory-
 | 4 | CTS | 7 | RTS | 4 | 7 |
 | 5 | GND | 5 | GND | 7 | 5 |
 
-### RS-485
+#### RS-485
 Connector [NS25-W2P](https://www.tme.eu/cz/details/ns25-w2p/signalove-konektory-raster-2-54mm/ninigi/)
 
 |Pin| Signal |