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How to Perform a Serial Loopback Test - National Instruments
A loopback test can verify the operation of serial communication by sending and receiving data from the same serial port. It can show problems in the serial port, the cable, or the software generating the messages without having to connect to third party hardware. Loopback tests can be used for RS-232, RS-422, and RS-485 serial communication.
RS-232 LED link Tester DB-9 Male to DB-9 Female
Or you can get a short serial cable on eBay for less than $2. Look for: RS232 DB9 9 Pin Male to Female Serial Port seen is the lug screw issue preventing you from plugging it into a piece of gear such as a TV RS232 port to determine serial TX pinout. This is easily resolved by swapping 9 Pin Serial "Tester" - RS-232 LED link Tester DB-991%(36)Brand: Cablemax
Amazon: CableMax RS-232 LED Link Tester DB-9 Male to
CableMax RS-232 LED Link Tester DB-9 Male to DB-9 Female The LEDs give you a very clear indication of what's going on inside your serial cable. Only caveat is that this is designed to be a pass-through device (one side is male, one female) but 4.5/5(64)
RS-232 Connections That WORK! - Serial, Ethernet & USB
Use Rule of Thumb - If the device plugs into the computer serial port and works normally, If the device connects to the computer port using a "null modem" crossover cable, it is wired as DTE. Use RS-232 Line Tester - A quick and easy way to determine the DTE/DCE
PC Cable Tester - All-in-One Universal Cable Tester
PC Cable Tester Pro & ATA - All-in-One Universal Cable Tester are the advanced version of the original PC Cable Tester - All-in-One Universal Cable Tester. The Pro version provide with the USB and 1394 Firewire cable test, the ATA version supports a serial ATA attachment. PC Cable Tester ATA - All-in-One Universal Cable Tester is capable of testing nearly every PC cable on the market.
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