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These converters allow your computer to communicate up to 4,000 feet by converting the RS-232 signal to RS-422.
If the peripheral to be connected has an RS-422 interface, only one converter is required. If both the data transmitting equipment and data receiving equipment use only RS-232, then two converters will be required, one at each end of the data line.
These models all have DB25 Female connectors on the RS-232 side and DB25 Male connectors on the RS-422 side. Models 422LCOR and 422CFCR require the 422PS external 12 VDC power supply. Model 422CEC requires the 422PS3 external 12 VDC power supply.
2, 4 and 8 channel RS-232 to RS-422 Converters
Model: Please see below