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Isolated Converters: RS-232/422/485 Wide temperature and power ranges make B&B SmartWorx isolated converters ideal for your harsh duty applications. Automatic Send Data Control, Modbus compatible. The RS-232 side has both a terminal block connector and a DB9 female connector; the RS-485 side has a terminal block. Requires external power supply not included.

Non Isolated Converters: RS-232/422/485 These RS-232 to RS-485 converters are perfect for applications that don’t require isolation or port-powered capability. All models include Automatic Send Data Control, eliminating the need for software modification.
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BBSmartworx ADAM-4520-EE ADAM-4520-EE

B+B SmartWorx Advantech ADAM-4500 Series RS232 to RS422/485 converter w/ iso. Rev. EE

ESP Price: $99.00
BBSmartworx ADAM-4520I-AE ADAM-4520I-AE

B+B SmartWorx Advantech ADAM-4500 Series RS232 to RS422/485 converter w/ iso (extended temperature)

ESP Price: $146.00
BBSmartworx ADAM-4521-AE ADAM-4521-AE

B+B SmartWorx Advantech ADAM-4500 Series Addressable RS422/485 to RS232 Converter

ESP Price: $217.00