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Forum Index : Microcontroller and PC projects : Quick handshaking question - CTS & RTS...

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Grogster

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Joined: 31/12/2012
Location: New Zealand
Posts: 9492

Posted: 09:12pm 11 Aug 2014

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Hi folks.

Normally, I don't use the handshaking lines, and just use TXD and RXD in my 232 corrector designs, but this time, I need the handshaking lines, to make use of the automatic handshaking feature of the MaxiMite COM1 port.

Are the CTS and RTS lines straight through, or do they cross over like the TXD and RXD does?

IE, is this correct:

TXD-RXD
RXD-TXD
CTS-CTS
RTS-RTS

...or is THIS correct:

TXD-RXD
RXD-TXD
CTS-RTS
RTS-CTS

I have a feeling that the first one is the correct one, as although the data is bi-directional, the handshaking lines are just high/low lines, rather then having a specific "Direction".

Do I have this right or wrong?

Thanks.

Smoke makes things work. When the smoke gets out, it stops!

atmega8

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Joined: 19/11/2013
Location: Germany
Posts: 723

Posted: 09:37pm 11 Aug 2014

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RTS WAITS FOR THE ANSWER OF CTS...AND SO ON.
SO RTS HAS TO BE CONNECTED TO THE CTS OF THE COMMUNICATION PATTNER.

Grogster

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Joined: 31/12/2012
Location: New Zealand
Posts: 9492

Posted: 10:37pm 11 Aug 2014

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Thanks.

Smoke makes things work. When the smoke gets out, it stops!

atmega8

Guru

Joined: 19/11/2013
Location: Germany
Posts: 723

Posted: 12:25am 12 Aug 2014

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Furthermore is RTS an Output and CTS an Input ( from the view of a PC).

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