4351B Port [caption id="attachment_1950" align="aligncenter" width="600"] 4351B[/caption] Models 4351A, 4351B, 4352A, 4352B, 4353, 4354 Serial port 4, RS-232/RS-485 port, DB-9 connector Network port 2, 10/100BASET Ethernet port, RJ-45 connector (Models 4351A, 4351B, 4353) 2, Fiber mode Ethernet port, MT-RJ connector with 62.5/125 um cable (models 4352A, 4352B, 4354) Port isolation 500