USB to RS232 on Androis tablet LOGICOM E912

[bisra]

I connected to my E912 tablet Logicom a Prolific USB to RS232 Circuit, id = 06b vendor, product id = 2303.
The circuit is not detected by the Linux kernel.
lsusb gives:
Bus 001 Device 022: ID 067b:2303.


The Prolific application "SimpleTest.apk" works on my phone but not on Logicom tablet.
Tablet:
Kernel version:3.3.0
n° build:E91220130704
Android version:4.1.1
weidi@brn-weidi#3
I would like to communicate using RS232 with this tablet. Do you have a solution for this?

 

[Spider]

Moved to Android Tablet Q&A.

 

[Traveller]

How old is your computer for it to still have RS-232 ports on it? USB, as I'm sure you likely know, has displaced RS-232 in most applications for two main reasons: faster speed and lower power requirements. I assume the peripheral you're attempting to use steps down the transmission speed and adjusts the power requirements to something the RS-232 port can handle?

 

[bisra]

I need to connect this tablet to an industrial machine that has only one RS232 port with Modbus protocol.
I found a ModBus Library Android which will allow me to make a panel with the tablet.

 

[Traveller]

It's good you found a library. But unless you can change the speed of the USB port and change the USB bus power requirements so the USB port can properly communicate with the RS-232 port, you're likely to be SOL.