3 ms·And this is why https://www.floppydisk.com/ https://www.floppydisk.com/ is still doing well.by meshaneian 4y agoAnd this is why https://www.floppydisk.com/ https://www.floppydisk.com/ is still doing well.doubleg72 4y agoNot to mention rs-232voytec 4y agoRS232 has adjustable frequency whereas USB can't be configured this way, making it useless for GPS devices used for time synchronization and such.