Detailed Explanation of Serial Ports, COM Ports, TTL, RS-232, and RS-485 Differences
Point: 1. The serial port and COM port refer to physical interface types (hardware). TTL, RS-232, and RS-485 refer to signal level standards (electrical signals). 2. When connecting devices, generally only GND, RX, and TX are connected. The Vcc or +3.3V power line is usually not connected to avoid conflicts with the power supply of … Read more