The connections for the serial loopback connector are given below in tabular form for a DB-9 D-type connector using the common pinout connections. Type a message using the computer’s keyboard. They can be made very easily either for DB9 or DB25 way connectors. These connections can be seen in blue on figures 5 and 6. Related Hardware USB 2. These loopback plugs are designed to work in conjunction with BurnInTest Professional allowing the quick diagnostic and troubleshooting of problems affecting serial and parallel ports. Back to Top 3.

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Very useful technical information. Any quick examples I can “borrow”? Tx characters from modem A to Modem B using hyper term.

Back to Top 4. These prices do not include shipping and do not include the BurnInTest Professional software.

This is excellent, well-presented and very helpful information for me! Who would have thought I’d finally get some use out of that Quarterdeck loopback plug set all these years later? These loopback plugs are designed to work in conjunction with BurnInTest Professional allowing the quick diagnostic and sr232 of problems affecting serial and parallel ports.

Pinout For Serial Ports and Loopback Test

The test loopback connector approach to testing has its loopbadk as it will not be able to detect speed mismatches or the like as the same issue is likely to be present on transmit and receive.


A couple of simple steps and I see all serial activity on my monitor.

I am not clearly know that rrs232 I use modem connect mode, what type of the loopback connector I need, or modem connect mode can not be tested by loopback? Note that not all serial devices, especially those with many connections on one card, allow hardware flow control on every serial output of the device.

Create a new connection with any name and icon.

Can any one put in some idea about why this happens. Supplier Directory For everything from distribution to test equipment, components and more, our directory covers it. By When I use modem connection mode? The one solution, which help me to make serial port test – http: This is exactly the article I was looking for.

The display window will then outline the write and read operations.

How do I create a loop back connector?

No cabling is required as these plugs are designed to connect directly to the back of a PC. Please contact for more ordering details. To perform this test, you need to temporarily connect the proper pins to allow signals to be sent and received on the same port.

Excellent looback for a starter. A loopback test can be used to troubleshoot serial communications. Exactly what I needed to sove a problem with a new Serial card. Wondering how the below can be done: The connections given below form a commonly used configuration. Serial Loopback Product Code: I need to send continous data in over a period of time from hyperterminal.


PassMark Software – Serial (RS) and Parallel Loopback Plugs

It is not recommended to use the 10P10C connector by itself to perform a loopback test due to the small separation between pins.

The loopback connections are useful on occasions for applications like self test. Hex 0xBFFF Insufficient location information or the device or resource is not present in the system. In this way the equipment can be used on its own to check that it can communicate, even if it is only with itself. These adapters plug into the serial and parallel ports of a computer, allowing the looping of the data and signal path by joining the transmit and looppback pins together. RS female DE-9 plug with connections required for loopback test.

Any data that shows in Hyperterminal is received from the device. Serial loopback plugs Quantity.