This article describes the Moxa 5110 and 5150 RS-232 serial to Ethernet adapters, and their use with the TTS-1nc. This device allows the user to separate the devices beyond the normal limits of serial cabling. Not all Moxa models supports RS-232, be sure to specify the correct version.
The 5110 is a dedicated RS-232 device.
The Moxa 5150 can be used for RS-485 or RS-232 devices. Be sure the jumper is in the correct mode.