Hi,
I have three devices with only UART in all three devices
what signal levels? V_ih, V_il
I need to communicate with all three devices at the same time using one USB
this means you want to send all three devices the same input data.
USB_out = device1_in = device2_in = device3_in?
can I use this device for my application ?
I see a good chance...
If yes, then how do I interface AD,BD,CD,DD Bus0 to Bus 7 to my device which has got only tx rx, Do I need to any interface IC?
What is "AB, BD, CD, DD" what is "Bus0 to Bus7"?
Also I know RS232 is multi drop. Can I use RS232 for this sort of communication ?
RS232 is not multidrop. RS232 tells the voltage levels for UART communication, usually peer to peer.
You may use UART as multi drop bus, but it needs extra hardware (optocouplers) and it needs a dedicated protocol (device adressing)
Only you know whether this requirements can be fulfilled by your devices...
Why not:
Use FT4232.
FTDI_UART1_Tx = device1_Rx = device2_Rx = device3_Rx
Device1_Tx = FTDI_UART1_Rx
Device2_Tx = FTDI_UART2_Rx
Device3_Tx = FTDI_UART3_Rx
Provided all voltage levels are compatible.
Klaus