Rs232 Serial Switch

8 way RS232/serial control relay module board/computer control switch MCU/PLC
US $20.00
DTU H101 RS232 switched WIFI serial port server
US $48.88
4xPrinter DB9 Pin Serial RS232 Switch Box Manual 4Port Data Sharing Switcher
US $31.43
serial Ethernet Switch Ethernet module |RS232/485/422 Ethernet ZLAN5103
US $55.10
[SA] PCMCIA turn RS232 notebook serial card HY CP03 original authentic
US $125.25