it depends on the device. if it is an Human Interface Devices,
https://docs.microsoft.com/en-us/windows-hardware/drivers/hid/introduction-to-hid-concepts https://developer.apple.com/documentation/kernel/iohiddevice?language=objc you normally interact via an installed device driver. if not (Arduino or something crude), you might be able to use libusb https://libusb.info c.f. https://github.com/miyako/4d-plugin-usb RS232C to USB converter is kind of a dying technology and it wouldn't be my first choice. c.f. https://github.com/miyako/4d-plugin-serial --- my point is, better not generalise the task as "2-way USB communication" you should find relevant technical information if you can be more specific about the device, platform, interface etc. 2019/06/25 7:52、David Loeppky via 4D_Tech <[email protected]<mailto:[email protected]>>のメール: Does anyone have experience with this? Ideally, some help in finding some technical documentation on how to do this would be ideal. ********************************************************************** 4D Internet Users Group (4D iNUG) Archive: http://lists.4d.com/archives.html Options: https://lists.4d.com/mailman/options/4d_tech Unsub: mailto:[email protected] **********************************************************************
