Hello, I am not able to get NUT working with a APC SC1500. The ups has only a serial port and came with a 940-0272a serial to usb cable. The cable has a fake Prolific chip in it, so only works by downgrading the driver to version 3.2. I tested a 940-0024C cable without success as well. The ups works with powerchute and apcupsd with the 940-0272a cable. Have not tested it with the other one. OS: Windows Server 2012 R2 NUT-Version: Windows-v2.6.5-6 UPS: APC SC 1500VA Driver: apcsmart upsdrvctl.exe start outputs this errors: ---------------------------------------------------------------------------------------------------------------- Network UPS Tools - APC Smart protocol driver 3.1 (Windows-v2.6.5-5-7-g72f380c) APC command table version 3.1 w32_serial_open (COM4) setting initial state on COM4 000000A8 = w32_serial_open (COM4) Warning: no locking method is available: No error [Der Vorgang wurde erfolgreich beendet. ] vmin_ 0, vtime_ 0 action 0 vtime 0, vmin 1 ReadTotalTimeoutConstant -2, ReadIntervalTimeout -1, ReadTotalTimeoutMultiplier -1 vmin_ 1, vtime_ 0 action 0 vtime 0, vmin -1 ReadTotalTimeoutConstant -2, ReadIntervalTimeout -1, ReadTotalTimeoutMultiplier -1 vmin_ -1, vtime_ 0 COM4: device reports different attributes than requested Communications with UPS lost: serial port read error: 1381(smartmode): Input/output error Communications with UPS lost: serial port read error: 1392(smartmode): Input/output error Communications with UPS lost: serial port read error: 1381(smartmode): Input/output error Communications with UPS lost: serial port read error: 1392(smartmode): Input/output error Communications with UPS lost: serial port read error: 1381(smartmode): Input/output error Communications with UPS lost: serial port read error: 1392(smartmode): Input/output error Communications with UPS lost: serial port read error: 1381(smartmode): Input/output error Communications with UPS lost: serial port read error: 1392(smartmode): Input/output error Communications with UPS lost: serial port read error: 1381(smartmode): Input/output error Warning: excessive comm failures, limiting error reporting Communications with UPS lost: serial port read error: 1392(smartmode): Input/output error unable to detect an APC Smart protocol UPS on port COM4 check the cabling, port name or model name and try again Network UPS Tools - UPS driver controller Windows-v2.6.5-5-7-g72f380c Driver failed to start (exit status=1) ---------------------------------------------------------------------------------------------------------------- I thought about using apcupsd-ups driver, but that one is not included in the Windows installation of NUT. What am I missing here? Freundliche Gr??e / Kind regards Michael Apelt, IT-Manager, Berky GmbH Tel.: +49 5932 7254 10 E-Mail: Apelt at berky.de | Website: www.berky.de Wacholderweg 27 | 49733 Haren (Ems) | Germany Ust.-IdNr.: DE 117327794 | Steuernummer: 61/200/20636 Osnabr?ck HRB 212862 | Gesch?ftsf?hrer: Frank Suelmann, Felix Knoll