Question about Intel HP Compaq NC6220 Notebook

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Com1 stops and starts

My com1 rs232 port disconnects from devices mid way through transfers etc. i have a pc card converter that appears to work ok. This is the second nc6220 i've had with the same problem, although there are 2 others here that work ok. the first pc that didn't work had the motherboard replaced and c drive formatted but that didn't help. Any help would be appreciated. there are no other irq's sharing the number. Thanks kazafog

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Re: com1 stops and starts

Just a suggestion: Check the command set for the transmission device. Compare the known good set with the problem device. Set them to be identical. If you are using PC CARD adapters, check their settings. If you are using an external modem, check the AT commandset : I don't think it's the Laptop Chipset. Also check BIOS.

Posted on May 18, 2007

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The protocol is basically 8N1 serial, but messages are separated from each other using an idle timeout (minimum 10 bit times - at 9600 baud this works out to be 1.25milliseconds). Messages consist of one message identifier (MID) followed by one or more data bytes and a checksum byte. The checksum should be the two's complement of the eight-bit sum of the MID and all the data bytes (a message is considered valid if the eight-bit sum of all the characters including the MID, data bytes and checksum is equal to 0). The total message length cannot exceed 21 bytes.
You cannot connect this directly to your PC without at least an RS485 to RS232 converter - you can get away without the pull-up/pull-down resistors for testing but should ensure that any termination resistor is open.
Hope that helps.

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Communication port is not working properly

COM1 and COM2 refer to a computer's communications, or serial, ports. COM1 ports are often used on older PCs to connect network devices, digital cameras and mice. Faulty drivers software that enables the hardware to communicate with the operating system or incorrect hardware configuration can influence COM1 behavior. In rare cases, the expansion card that adds the serial ports to the PC can fail, rendering both COM1 and COM2 ports useless. To repair a COM1 port, you must determine what is preventing the port from working before attempting a solution.

Click "Start." Go to "Control Panel" and then click "Hardware & Sound." Select "Device Manager" from the submenu. Expand "Ports (COM & LPT)." Double-click "COM1." Review Device Status on the General tab to check for problems with the software driver. If the message "The Device Is Working Properly" appears, click "OK" to close the window; otherwise, look up the error message on Microsoft Support. Follow the directions in the Knowledge Base to correct the issue. Press "Alt" and "V" to open View. Scroll to "Resources by Type." Press "Enter." Double-click "Interrupt Request (IRQ)" to see a list of devices. Double-click "Communications Port (COM1)." Check the term to the left of COM1 to see if the card uses an ISA or PCI interface. If the card uses a PCI interface, it can use the same IRQ as another PCI device without producing a hardware conflict. If the device is ISA, it needs its own IRQ. Go to the "Resources" tab. If "No Conflicts" appears in the Conflicting Device List, close the window; otherwise, uncheck "Use Automatic Settings." Click the drop-down menu and select each configuration until the port no longer interferes with another device. If conflicts occur with each configuration, double-click "IRQ"; you may need to try different configurations before Windows gives you permission to edit the interrupt request. Click the up or down arrow to change the IRQ until the message "No Devices Are Conflicting" appears in the Conflict Information field. Click "OK" to close each window. Click "Yes" when prompted. Connect a device to the COM1 port to test the port. If the device doesn't respond, shut down the computer and then unplug the power cable. Disconnect all devices from the back of the PC. Remove the case cover and touch the computer's chassis. Set the computer on its side so that the PCI and ISA cards sit at a 90-degree angle to the floor. Find the serial ports on the back of the PC. Look on the opposite side of the case to find the associated card. Shine a flashlight onto the card and make sure that the copper contacts are not visible. If you can see the contacts, reseat the card in its slot so that it's fully installed to the motherboard. Reassemble the case and boot into Windows to test the COM1 port. If the port still fails to work, you may need to replace the serial port card.

Jan 16, 2013 | PC Laptops

1 Answer

Can't communicate on the COM1 port

Is this a printer you have installed and are trying to print to it? Maybe you don't have the printer configured properly. More than likely you should be using a usb port instead of a com1 port if it is a printer. Open your printer and check the properties.

Modems also use com ports, so check your setup if you are using a modem.

Jun 06, 2012 | IBM ThinkPad A31 Notebook

1 Answer

I need a laptop with RS232 port. What model should I get?

RS232 is now not being fitted to laptops This has become old technology. If you have devices that require connecting via an RS232 There are USB cables that emulate the connections of an RS232 that can be set to a com port to fool the device that it has the rightr connection. Look on Ebay there are quite a few at various prices, most from Hong Kong. I have bought aqnd used them to connect my radio scanners and Scancat software to program Amateur radios quite succesfully, as well as to run my old HP A3 scanner

Please rate my help++++Thanks for using FIXYA

Jun 20, 2010 | Toshiba Satellite M35X-S149 Notebook

1 Answer

I don't know how enable infrared port in my pc - ibm thinkpad x 41

By default, currently available ThinkPads come with the external serial port disabled and Infrared enabled on COM1. To use the serial port on COM1 you must either disable infrared or change infrared so that it uses alternate resources. If you are not using infrared for printing or file sharing it is recommended that it be disabled. Here are the steps to follow to enable infrared :

1. Double-click your ThinkPad Features or ThinkPad Configuration icon located in the ThinkPad folder on your desktop.

2. Locate the Infrared button located on the left-hand side of this configuration screen and click it once. (Note: If you hold your mouse pointer over any of the icons in this configuration screen the button will be identified at the bottom in the status window.)

3. Change Infrared from "Disable" to "Enable" and click "OK".
4. Locate the serial port icon and click it once.
5. Select serial port "enable" and insure that the COM PORT setting is "COM 1" and click "OK".
6. Shut down and restart the computer.

Jan 19, 2010 | IBM ThinkPad X41 Notebook

1 Answer

USB doesn't work

do have the driver for the IBM? then use it. if you don't, then what about serial port or RS232. get a converter that is serial to usb converter with the driver will allow you to use your usb through serial port.

Apr 07, 2009 | IBM ThinkPad T43 Notebook

1 Answer

Wireless Card not working

Possibility one: defective wireless card. Possibility two: improperly installed card driver.
Possibility three: wrong card driver
Possibility four: device conflict with card
For possibility four, does the card stop working when you use another device on your machine? Try disconnecting all other connected devices outside of the laptop (printers, scanners, webcams, MP3 players, etc) and see if the issue goes away. Keep us posted.

Feb 22, 2009 | Toshiba Satellite Pro S300-S1001 Notebook

1 Answer

Can't fax - modems not being detected

ok, a modem on COM8 ? Normally modems are on COM1, COM3. You need to fix that problem first. Most softwares are not setup to scan that high for the modem. (ps: COM2, COM4 are usually for other devices - in the old days, mice were on COM2). Follow instructions:

Click over to MODEMS
Click on Proper MODEM
Change COM8 port to COM3
click OK, probably going to have to restart computer.

Let's see if this actually solves the issue. if it did not and you need more help, contact me through this site and we will proceed forward.

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Pentium III 800 mhz T21 Thinkpad Internet connection problems

why fight it , let it be on com 1 then,
go into the bios and disable the serial ports .
that may be the easiest fix as long as you don't need the serial port for anything.
but if you have a serial mouse oh boy.

May 13, 2008 | IBM ThinkPad T21 Notebook

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