When do i need a null modem




















Notice that Pin 2 on one side connects to Pin 3 on the other side:. The next picture below is pinout diagram which shows the incorrect cable to be used which is a "straight through" serial cable. Notice that Pin 2 connects to Pin 2 on the other side, making this a straight through cable:. To connect to the serial console, use the following hyperterminal settings which is mentioned in the KB, What hyperterminal settings to use to connect to the serial console. The settings mentioned in that KB are listed below:.

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Payment Terms. Similarly, the receiving device's transmission line is routed to the communicating device's receiving line. The effect of the terminal crossover is to simulate a DCE device at either end of the cable. Null Modem Cable with Handshaking Route. Simple Straight Through Cable Route.

Additional Information To tell if your NI serial cable is null modem or straight though, search for its part number in NI Serial Hardware Specifications and Features and note the cable type in the description. Alternatively, you can use a handheld DMM to test continuity on the individual pins of your serial cable. If every pin is electrically connected to the corresponding pin on the other end, i.



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