why it is called null modem cable?

karthiprime · Dec 20, 2012

Hi all,
I understood what Null modem is by googling, but wondering why it is called so....

Thanks

karthiprime · Dec 20, 2012

Still looking for the answer...

Thanks

alexan_e · Dec 20, 2012

https://en.wikipedia.org/wiki/Null_modem

Null modem is a communication method to connect two DTEs (computer, terminal, printer etc.) directly using an RS-232 serial cable. The name stems from the historical use of the RS-232 cable to connect two teleprinter devices to modems in order to communicate with one another; null modem communication was possible by instead using RS-232 to connect the teleprinters directly to one another.

why it is called null modem cable?

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