Flow control on Arduino USB serial link without an FTDI chip

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i intend use arduino micro interface serial device bus acts intelligent mediator between computer , bus. various devices attached bus, therefore arduino employs collision detection - collision avoidance scheme before writes serial device bus. bus connected 2 io pins controlled modified softwareserial library.  cdca scheme means pc must
(a) wait sending data until arduino sees free time slot on bus ,
(b) wait next command until last transmission has been processed , response 1 of bus devices has been received.

this no problem arduino on rs-232 connection rts/cts or on implementations separate ftdi chip has rts/cts pins (does chip translate signals on these pins xon/xoff flow control?).

but usb serial interface on arduinos usb controller part of microprocessor arduino micro 32u4? possible implement equivalent rts/cts flow control usb serial link, , how control signals? 

the other alternative have serial usb interface pc external ftdi breakout board connected arduino serial interface tx/rx pins , add'l i/o pins designated rts/cts control pins. 

i can't understand description of problem suggestion in final paragraph seems sensible.

why have several devices on same serial connection?

why not use mega 4 hardwareserial ports?

do devices need use serial connection - maybe use spi or i2c - both of can handle multiple slaves.

if need have several devices on 1 serial connection treating 1 device (perhaps arduino) master , arrange others keep quiet until receive suitable message arduino (conceptually similar xon / xoff different flavour each device.

can make pencil diagram showing parts of system , interconnections , post photo of it

...r


Arduino Forum > Using Arduino > Interfacing w/ Software on the Computer > Flow control on Arduino USB serial link without an FTDI chip


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