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    购买 rs232 level shifter

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    $169.99
    ICP DAS Isolated RS-232 To RS485 Converter
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    Marshall Electronics VS-PTC-200 Compact PTZ Camera Controller PTZ Camera Controller With 4D Joystick, 1-Touch Controls, Full-Duplex RS-232/RS-422
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    Laurel Electronics LT2 DCA/DCV-To-4-20 Dcma & RS232/RS485 Transmitter
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    eBay.com
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    Ge Rs232 Total Lighting Control Ivory Remote Control Switch New-B
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    Amazon.com
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    Free shipping
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