The S117P1 is a converter that realises a serial connection via RS232, RS485 or TTL, using a USB port on the PC. Through the drivers the operating system treats the serial interface like a standard serial port, allowing the use of the converter through any software that can communicate with the standard serial ports in the operating system (COM1, COM2, ecc.). RS232, RS485 and TTL ports are electrically isolated from the USB avoiding most of the problems of electrical noises.