Hi,
I have a RUT956 device and I have used the USB port to read data from a sensor sending ASCII strings via a RS232 to USB FTDI device.
So the setup is: RS232 sensor → FTDI chip → RUT956 USB port.
I have made some code in the Teltonika Busybox to interpret and send the data. This works great.
Then, I have replaced the FTDI chip with USB hub and to the hum I have connected a USB stick for storage expansion and the FTDI chip. This still seems to work fine.
I was wondering if I can plug more FTDI chips to the USB hub. Is there a limit, or I could potentially read data from 4-5 sensors via FTDI chips, connected to the hub?
Apologies for a delayed response. Theoretically, you can connect multiple FTDI chips to a USB hub, as USB 2.0 can support up to 127 devices. However, in practice, you’ll be limited by the bandwidth and power constraints of the USB host controller.
For your setup, most likely RUT956 should be able to handle 4-5 FTDI devices, provided that:
You use a good-quality, powered USB hub to avoid power limitations.
The sensors don’t transmit at extremely high baud rates (e.g., >115200).
The recommendation is to start with 2-3 devices first and monitor system stability before scaling up.