![]() ![]() ![]() ![]() There would be a different set of pins for handshaking but doesn't matter with none. I was using a 9 to 25 modem cable but 2&3 fit for 9 pin cables too. RE: How yo check if Serial Port ( COM 1) working bronano (TechnicalUser) Give the wrong symptoms, get the wrong solutions. If you have access to a VOM it might be worth a few minutes to ohm out the end to end connections to insure you are dealing with a null cable with minimal handshaking available. Modem cable > 25p-25p gender changer > null adapter > 232 patchĢ&3 shorted on the patch adapter, no other wires inserted On the test setup it required 4&5 (25 pin connector) to work in hardware handshake but 2&3 worked without the 4/5 jumper while in Xon/Xoff or none. It is probable that you got no display on the screen when you shorted 2&3 because the flow control setting was set to hardware and you didn't have the handshake lines connected. Hyperterm takes keyboard input and puts it out to the com port and takes stuff off the com port and puts it on the display. When you run hyperterm the connected at the bottom left only indicates that there is a com port recognized, it has nothing to do with anything possibly connected on the other side of the chip.
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