Loopback serial7/9/2023 This is never more important than when you're operating on power-input circuits. You should always use industry-standard safety procedures when working with any electrical equipment. These tips are intended to be used only on data ports, where the electrical flow is minimal. Warning: Exercise caution when working with electricity You'll simply need to shape the paper clip into an appropriate shape and insulate it from your hands with a napkin or some other insulator. You can connect virtually any 2 pins on a 50-pin Amphenol connector. You can use a screwdriver to short 2 female pin sockets on a DB9 serial port. It's very simple to use a screwdriver to short a pair of pins together to test your RTU's inputs during diagnostics.Ī paper clip takes more time than a screwdriver, but it has much more versatility because it can be bent. It has 50 pins, and each discrete alarm (contact closure) input is a pair of contact pins across from one another. The classic example of this kind of port in remote monitoring is the Amphenol connector. You can even achieve a slight diagonal if you need to connect 2 pins that are not directly across from one another. A slot/flat screwdriver head will usually be the right width to bridge pins. a paper clipĪ screwdriver is the right tool when you have an open connector with pins on 2 sides. To make sure, loop the far-end port's TX pin to its RX pin, make a Telnet connection to the far-end device and perform a loopback test there.Ī paper clip or screwdriver can be a great troubleshooting tool. If the cable is OK, the problem might be on the far-end port.You may need a null-modem adapter, which reverses the TX and RX signal. The near-end and far-end ports may have identical pinouts, so using a straight-through cable will result in one TX pin being connected to another TX pin. But before you replace the cable, double-check your pinouts.If the cable fails the loopback test, you might need to replace the cable.Make a Telnet or proxy connection to the near-end device and perform a loopback test.Unplug the cable at the far end and loop the TX pin to the RX pin.The next step is to test the problem port's cable.If the result of the loopback test is different, the port may be defective. If the result of the loopback test is exactly as described in Step 3, the port is physically OK.Without the loopback, you should not see the character echoed. ![]() Now remove the paper clip from the port and type a character. You should see the character echoed on the screen.
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