The 49TCS142ST converter has a multiple interface circuit capable of managing serial RS-232 or RS-422/485 interfaces and single-mode fibre (ST connector), with loop and point-to-point transmission. They are used to extend the serial transmission of the Logirack system up to 40 km. They can be configured to convert RS-232 signals or RS-422/485 signals, but not both at the same time. Power supply 12 to 48 VDC (power supply unit 49ABM124 optional), facility for DIN bar mounting.