badai Posted July 4, 2006 Report Share Posted July 4, 2006 I have serial cable consist of 4 ports(on pcb).........one of them cannot work(physical problem). My expectation is because of the IC on that port. So, how i can know this is because of IC problem? Is it enough to test it using multimeter and compare with other IC from different port??? Any idea Quote Link to comment Share on other sites More sharing options...
MP Posted July 5, 2006 Report Share Posted July 5, 2006 You have data bits on this line, which are just pulses. Use a scope or other device that will allow you to watch the pulse stream and compare with the other ports. By working your way through the circuit, you will be able to find the place where the signal stops.MP Quote Link to comment Share on other sites More sharing options...
prateeksikka Posted July 11, 2006 Report Share Posted July 11, 2006 i feel that u dont even need a scope!!.u can perform continuity test using a multimeter only... Quote Link to comment Share on other sites More sharing options...
MP Posted July 12, 2006 Report Share Posted July 12, 2006 You cannot measure continuity through the RS232 driver circuit. You will need to follow the pulse stream and see where it ends.MP Quote Link to comment Share on other sites More sharing options...
Theatronics Posted July 12, 2006 Report Share Posted July 12, 2006 When you say the port is on a PCB and connected to a 'Chip'Is this perhaps a UART or a Driver chip? For smaller projects I like the MAX232.I have had a lot of luck with an inexpensive logic probe.It shows 2 LEDs (Red=High, Green=Low) It is easy to followa serial signal through a circuit just with that tool.I the device connects to a terminal of any kind, is it possiable to remove the driver chip/Uart from a socket and jumper the TX and RX signalsto create a Loopback test. This will confirm that the problem is NOT in the circuitry leading up to the IC.Send more details, This should be easy to hunt down. ;)-Mike Quote Link to comment Share on other sites More sharing options...
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