I think,many developper will be found the serial port problem,today i have solution to fix this problem.
What’s going on: Creating a loop with a paper clip may seem silly, but it’s actually a great troubleshooting tool. By looping the transmit and receive pins, you can test whether the ports and connectors transmit and receive valid information. This is called a loopback test.
If all above are correct, please try to change to other serial port or other computer.
If it can use on other computer or other serial port, you can think that maybe the serial port is disabled in BIOS setup.
How to fix the serial port problem?
If the device will support it, make a Telnet or proxy connection to the near-end device.
Perform a loopback test: Type any character. You should see the character echoed on the screen. Now remove the paper clip from the port and type a character. Without the loopback, you should not see the character echoed.
What is going on: Create a loop with a paper clip seems silly, but it’s really a great tool fabhtcheartaithe. Since looping send and receive pin, you can test whether port and transmit chónaisc and get valid information. This is called the loopback test.
-If the device will support it, or to connect to Telnet proxy device at the end.
-Loopback test performance: Type any character.
You should see the document character is reflected on the screen. Now remove the paper clip from the port and the type of character. Without the loopback, you should see the repeated characters.
-If the test result is a loop just as described in step 3, the port is physically OK. If the loopback test results to various faulty port.
The next step is to test port cable problem.
-Disconnect the cable at the other end and loop TX RX pin to pin.
-Do Telnet or proxy connection to the device in the near-end loopback test and are in compliance.
-If the cable fails the loopback test, you may need to replace the cable.
-But before replacing the cable, double-check the pinouts. The end is near and the other end of the port to be identical pinouts, for example by cable directly through resulted in one TX pin must be connected to another pin TX. You may need a null modem adapter, which turns TX and RX signal.
-If the cable is fine, the problem may be in port until the end. To be sure, the far-end loop port pin to pin RX TX, Telnet to connect to the device and the end-loopback testing on the spot.
How to fix the problem on serial port?
The following options to solve the problem for COM port:
1. Enter the start bis mode on your computer and ghníomhachtú the serial port if it is disabled. Not sure if your modem is used in combination with car port COM port, I / O can be in conflict.
To enter the mode by pressing the start of bis key during the startup of the computer, such as DEL, ESC Ctrl-Esc, Ctrl-Alt-Esc. However, it depends on how each computer station, but the most likely message “Press DEL key to enter setup on the bis.
Then, go to Integrated Peripherals Menu replacements with the serial port. When you are done with the change to enable / disable serial port, you must save each site before retirement bis configuration method.
2. You can solve this problem by configuring the serial port on the board with disabilities to use the port base address and IRQ value does not coincide with other serial port on the modem or computer. For example, you can get RID of conflicts with other ports by configuring the port to be forwarded base 3E8 is COM3, IRQ5 then use but you must ensure that no devices using IRQ 5.
3. If above can not solve problems, try another option: select the serial port or modem in bis use the computer or modem for all riders to be on the port that is not in conflict (eg COM3 3E8 against to use base IRQ 5). Non-additive Modems & fun jumpers at specific purposes. You must indicate to the computer that the modem or configure the modem to use manual. Sometimes, the parameters of May, or on a printed circuit on the modem of course.
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