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Does a USB to RS-232 Converter work both ways?

2018-10-26 FAQ Document No.1-00000587

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232USB9M/ 232USB9M-LS/ SSU2-100-EMB/ US9ML2-2/ US9ML2-4/ USO9ML2/ USO9ML2-2/ USO9ML2-LS/ USO9ML2DR-LS

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Solution:

  • Does a USB to RS-232 Converter work both ways?

    USB to serial converters will only work if the USB device is the PC. There is no device that will allow you to do the opposite. Q: Does a USB to RS-232 Converter work both ways? A: The RS-232 connections provide standard inputs and outputs that match a regular 9 pin or 25 pin serial port. A USB converter must connect to a USB Host port. The USB connector (Type A Male) only fits upstream device connectors (Type A Female) such as a Host port. USB Device (slave) devices which don't have a cable attached have a downstream (Type B Female) connector. Q: My computer has only a 9 pin serial port but my new device (Printer, Camera, etc.) has only USB Connections. Do you have a converter that can be used to connect them? A: You need a USB Host Connection to support the USB device. A USB Host Connection cannot be supported by RS-232 Serial port connections since the USB host port requires a microprocessor and software to drive it. In theory, a USB Serial Server is possible, but not practical since special drivers would still be needed on the computer for each device.

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