Silviu,

As far as I understand each device has the lines
RTS as output
CTS as input

The RTS line is connected to the CTS line of the other device.

The RTS line is set:
- LOW when the device cannot receive data (for whatever reason, most likely buffer full condition).
- HIGH when the device can receive data.

if CTS line is read:
- LOW then data must not be transmitted
- HIGH then data can be transmitted


However, the http://gladstone.uoregon.edu/~tsinger/...RS232.html document you referenced to describes things different.

I now refer to RTS/CTS in the HANDSHAKING section.

The explaination differs from what I understand, so my interpretation is probably wrong, but when the practical diagram is explained I find this: "This situation is not clear ...".

I don't get it

Kind regards,

Joachim.

PS: I indeed intend to implement flow control between a modem and a computer.

Where can I find more information about the RS-232d standard?