Advantech BB-232OPDRI Serial Repeater, RS-232, TB, Triple Isolated, 10-48VDC, DIN Rail Mount, UL C1/D2 $273.00 Select
Advantech BB-422PP9TB Serial Converter, RS-232 DB9 F to RS-422 TB, Port Powered, Converts RS-232 (DB9F) to RS-422 (DB9F), Bidirectional $89.00 Select