Hi,
I’m in the process of coding an app using RS232 on a BL2600 – I’m trying to figure out the RTS/CTS behaviour on the board, and can’t find any information anywhere else.
What I want to know is which of the two behaviours the board will use when doing 5-wire RS232 communictation (pulled from: RS-232 - Wikipedia):
The standard RS-232 use of the RTS and CTS lines is asymmetrical. The DTE asserts RTS to indicate a desire to transmit to the DCE. The DCE asserts CTS in response to grant permission. This allows for half-duplex modems that disable their transmitters when not required, and must transmit a synchronization preamble to the receiver when they are re-enabled. There is no way for the DTE to indicate that it is unable to accept data from the DCE.
A non-standard symmetrical alternative is widely used: CTS indicates permission from the DCE for the DTE to transmit, and RTS indicates permission from the DTE for the DCE to transmit. The “request to transmit” is implicit and continuous. Thus, with this alternative usage, one can think of RTS asserted (logic 0) meaning “ready to receive characters” from the DTE, rather than a “request to transmit” to the DCE.
Is it the first, or the second method that will be used, or is it possible to switch between the two?
Thanks,
–Chris