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How many levels of handshake do you need in serial communication of a null modem?

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watertreader

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Hi,

Just a query. For Serial communication in a null modem configuration, how many level of handshake do you actually need?

Is it as follows:
For transmission side, you are supposed to send a DTR signal and wait for an DSR response. Then do you actually need to use the RTS and CTS pair if no modem is involved?


Thanks for your help!
 

Re: Serial Communication

Hi,

So only a RTS/CTS flow control is neccessary? I mean, we do not actually need to implement the DTR/DSR flow control?

THanks for your help!
 

Re: Serial Communication

watertreader said:
Hi,

Just a query. For Serial communication in a null modem configuration, how many level of handshake do you actually need?

Is it as follows:
For transmission side, you are supposed to send a DTR signal and wait for an DSR response. Then do you actually need to use the RTS and CTS pair if no modem is involved?


Thanks for your help!
Click to expand...

Here the pin connection in male/female RS232 9pin Dsub is shown .....
 

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