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In that case it looks like usb.Open is returning usb.USB_NONE (0) which means that UsbSerial has not recognised the device. This is probably because it does not recognise at least one of the Driver, Product or Vendor Ids. It looks from your photo that it might be a CDC ACM type device so try this be
link: i have been used felUsbSerial and UsbSerial lab but they not working just giving me details without any proper connection. Send and Stop buttons are
link: Hi Guys Im using external GPS dongle connected to my tvbox device via USB port, it working perfectly with app called GPS Connector https://play.googl

The usb-serial-for-android project and therefore also this library is licensed under the GNU Lesser General Public License v3. http://www.gnu.org/licenses/lgpl.html|http://www.gnu.org/licenses/lgpl.html Copies of both the General Public License and Lesser General Public License are in the provide
link: Hi Agraham, I tried to use your library but I always get error when open(9600,1) serial comm. I jump to Java (Android Studio) and I'm already printi
link: I tried v2.4 of USBSerial. Port1 indicated a Qualcomm and port 2 indicated an FTD device. Debug messages stated error opening port 1 and 2. I ran the
link: Hi, I'm, trying to use usbserial with two USB ticket printers. Our app works perfectly with ethernet and bluetooth ticket printers but it is complete

You should Dim + Initialize usb1 and stream1 in open_port.
link: What would be the correct sequence for closing a serial port (in case the USB-Serial adapter is disconnected) and opening it again? like

Very unlikely unless your serial device is an Android Accessory - which it almost certainly is not. You should be able to use UsbSerial.DeviceInfo. Just call it without calling Open and before initialising anything in felUsbSerial as DeviceInfo is effectively a stand-alone method and does not rely o
link: I've removed usbserial.close from the code when the app is closed. Now the other USB application receive data, but mine (with felUSBSerial) not, even
link: If it works without the definition but fails with only the definition added then I am afraid that I cannot explain it. There must be a conflict betwee
link: I found the following comment in USBSerial.close: " There is a bug in the Android USB Accessory handling when trying to reconnect to a disconnected Ac

Dear All, I tried to read a QR Code reader device into my Orange Pi device and use the USBSERIAL2 V 2.4. It successfully Open, but there is an error like below log, Program i used : Sub btnOpen_Click If usb1.UsbPresent(1) = usb1.USB_NONE Then ' Ver_2.4 Log("Msgbox - no device")
link: Code with Msgbox = broken code. The error is not coming from AsyncStreams. First step is to run in debug mode and fine the correct line.
link: Hi Erel, Tks for your reply, i just tried to remove the msgbox, but the error still remain the same... Hmm... Tks

This library wraps the following open source project: https://github.com/felHR85/UsbSerial (MIT license). It is an alternative to the UsbSerial2 library. The following devices are supported: CP210x, CDC, FTDI, PL2303 and CH34x. Usage is simple. You find the UsbDevice with USB library and then ini
link: When I use the other lib with USBSERIAL instead of FELUSBSERIAL the communication is real time, but when I connect with usb.Open(9600) in the example
link: V1.10 is attached to the first post. It it based on the latest version of the open source project: https://github.com/felHR85/UsbSerial
link: You can either use UsbSerial library or this one.

Good morning, i am trying to compile the original UsbSerial library but i get this erro Starting step: Compiling Java code. javac 1.8.0_171 C:\Android\SLC\UsbSerial\src\anywheresoftware\b4a\objects\UsbSerial.java:185: error: method open in interface UsbSerialPort cannot be applied to given types;
link: here's the source for the latest version 2.5 with the fix for a required flag in PendingIntent. It compiles for me using SLC.
link: Completed successfully. *** Non dimenticare di aggiornare l'elenco delle librerie nell'IDE (fai clic con il pulsante destro del mouse e scegli Aggiorn

Hi, UsbSerial V2.4 works well with original Arduino but I have an error on open(9600 , 1) with a clone Arduino (ch340g chip). Can you help me ? Best regards
link: You can try felUsbSerial - Alternative Usb Serial library.

I create this code for open each port with: device_0 and device_1 as each UsbDevice usbserial_0 and usbserial_1 as each UsbSerial but I dont understand what is the event of each port Private manager As UsbManager Private device_0 As UsbDevice Private device_1 As UsbDevice
link: Don .... Thank's a lot... I have discovered the event!!!! usbserial_0.Initialize("serial_0", device_0, -1) 'Port 0' usbserial_1.Initialize("serial

I have another question regarding USBserial : If usb.Open( 9600,1) = usb.USB_DEVICE Then AStream.Initialize(usb.GetInputStream,usb.GetOutputStream,"") AStream.Write(Array As Byte (0x0f)) after that I can see in the debug watch window the entry "Astream / ain / buff
link: You cannot use AsyncStreams without the events. The NewData event will be raised whenever there is data available.
link: I don't understand why ? I can see the data at debug mode in the watch window : UsbSerial.driver.mReadBuffer ... When I can see it there why not in ma

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