18-ch - Digital - Isolated I/O Modbus TCP Module 18-ch - Digital - Isolated I/O Modbus TCP Module $559.26
14-ch - Digital - Isolated I/O Modbus TCP Module with 2-ch Counter 14-ch - Digital - Isolated I/O Modbus TCP Module with 2-ch Counter $549.44
Lantronix - FRUSB1601 - Console Manager 16-Port USB I/O Module FRUSB1601 - Lantronix - Slc 8000 16device Port Usb I/O Module For Adv Con Mgr $2,348.91 $1,909.68