[Oberon] Hardware flow control on RiskFive.

peter at easthope.ca peter at easthope.ca
Thu Oct 18 16:53:16 CEST 2018

Hello Wojciech,

In http://riskfive.com/ under "RS-232 interface" is, "Hardware flow 
control is used (CTS connected directly to RTS)."

If CTS is shorted to RTS, rather than connected to the remote 
equipment, how can hardware flow control operate?
Ref. https://en.wikipedia.org/wiki/RS-232#RTS,_CTS,_and_RTR

Symmetrical hardware flow control could be provided by using RJ14 on a 
6P4C connector.  For example, transmit and receive on contacts 2 and 
3; RTR and CTS on contacts 4 and 5.
Ref. https://en.wikipedia.org/wiki/Modular_connector#6P6C

If the chip on the board already supports TIA-232-E, then genuine flow 
control could be provided using a 6P4C or 6P6C socket and adding a 
couple of short lines on the board.  The cost difference (6P2C vs. 
6P4C) is very small.

Regards,              ... Lyall E.

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