![Fanless Mini pc (Small computer) Echo 77F extended (wide) voltage, with 4x COM (Serial Port RS232)~ Multiple 2 x Gigabit LAN(Network)~ 6 x USB ~ CFast Slot. Fanless Mini pc (Small computer) Echo 77F extended (wide) voltage, with 4x COM (Serial Port RS232)~ Multiple 2 x Gigabit LAN(Network)~ 6 x USB ~ CFast Slot.](https://www.cappuccinopc.com/media/images/gallery/echo-77f/main1.jpg)
Fanless Mini pc (Small computer) Echo 77F extended (wide) voltage, with 4x COM (Serial Port RS232)~ Multiple 2 x Gigabit LAN(Network)~ 6 x USB ~ CFast Slot.
![voltage - How to implement Serial port RS-232 from 2.5V IO signal? - Electrical Engineering Stack Exchange voltage - How to implement Serial port RS-232 from 2.5V IO signal? - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/TvEVj.jpg)
voltage - How to implement Serial port RS-232 from 2.5V IO signal? - Electrical Engineering Stack Exchange
![does a serial port have enough power to drive a comparator circuit? - Electrical Engineering Stack Exchange does a serial port have enough power to drive a comparator circuit? - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/ihoGM.png)