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Loopback test rs2328/21/2023 You did connect two outputs together (two pins were “supplying voltage”), and you should be willing to consider the possibility that both were not at the same voltage level. Your device apparently broke, so can’t you see how unlikely it is that you were using it in an ideal way? Instead of stubbornly clinging to the position that you did nothing wrong when even your friend says your approach was poor, you should be trying to understand what might have gone wrong, which would entail asking someone whose opinion your respect (it doesn’t seem like we fall under that category) what kind of things could damage a device. No, you and he were discussing an idealized scenario, and given the description of what you did, it is almost certainly not applicable to your situation. Source: ġ GND GND Black Device ground supply pin.Ģ CTS# Input Brown Clear to Send Control input / Handshake signal.Ĥ TXD Output Orange Transmit Asynchronous Data output.ĥ RXD Input Yellow Receive Asynchronous Data input.Ħ RTS# Output Green Request To Send Control Output / Handshake signal. What does the 23201a need besides VCC, GND, RX and TX?įor reference, below is the standard FTDI pinout. I unplug the 23201a from the breadboard and loop from Orange to Yellow and I get echoes. I tried switching Orange to RX, Yellow to TX. I looped back pin 23 on the DB-9 and tried Yellow to RX, Orange to TX. In description that follows, colors are FTDI standard abbreviations are on the 23201a. What I have is an FTDI cable to a small breadboard. So my terminal program works fine for this test and my FTDI cable sends and receives data just fine (I use it often for programming it works). It fails when Rx and Tx looped back on the DB-9 but works if I remove the 23201a and just connect Rx to Tx to loop back FTDI. And just as a quick sanity test before hooking up an external source, I tried a loopback test by connecting Rx to Tx, typing characters in a terminal program and looking for echoes. But before doing that, I want to make sure I have the serial interface correct, so I am hooking it up to my FTDI cable. What I want to do is read the output of a depth sounder, which is 4800 baud RS-232 data.
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