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2.0M DB 9F To DB 9F NULL MODEM Cable


2.0M DB 9F To DB 9F NULL MODEM Cable

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2.0M DB 9F To DB 9F NULL MODEM Cable

True Null Modem Cable
A fully functional Null Modem cable (Model B in the figure) allows for hardware flow control and for each computer to detect whether the connection is active. In this cable, complementary circuits are crossed over end-to-end rather than jumpered within each connector: RD and TD, RTS and CTS, DTR and CD, etc, so (for example) the software on one end of the connection can "hang up the phone" by turning off the DTR signal and the software on the other end will see the CD signal go down, even though there are no phones or modems.