Advantech BB-485USB9F-4W Serial Converter, USB 2.0 to RS-485 4-Wire DB9 Female Serial Connector, USB Cable Included $106.00 Select
Advantech BB-232OPDRI Serial Repeater, RS-232, TB, Triple Isolated, 10-48VDC, DIN Rail Mount, UL C1/D2 $273.00 Select
Advantech BB-485DRCI Serial Converter, Converts RS-232 to RS-422/485 Converter, Triple Isolated, C1D2, DIN Rail Mount, DB9F / TB, 10-48VDC External Power Supply Sold Separately $237.30 Select