Showing results for 
Search instead for 
Did you mean: 
New member
2 1 0 0
Message 1 of 2
Flag Post

PA716A serial port adapter issues in Windows 10/Z240

HP Recommended
Microsoft Windows 10 (64-bit)

Hi all.  We've been using Z240 workstations running Windows 7 for many years, along with the serial port adapter (PA716A), which plugs into the motherboard via a ribbon cable. We've now started using Windows 10 (64 bit) and are having repeatable issues with this adapter there weren't present in Windows 7. The issue is that after restarting the PC we no longer receive data into the serial port. COM1 is still present in device manager but no data is received. The fix is to power down the computer, wait 30 seconds, then turn it back on. Then the serial port starts working again.


We have this on multiple Z240 PCs but only those running Windows 10. I don't believe there's a driver for this serial port adapter as Windows just sees it as an onboard serial port.


Is anyone else seeing this? We can switch to using PCIe serial cards instead if we have to, but the serial adapter is a much neater solution.



Level 11
4,483 4,466 406 934
Message 2 of 2
Flag Post
HP Recommended

i don't have a z240 so i  can't help there, but i can offer a solution/test


install a 3rd party pci-e serial card (try to use one which has a diffrent serial chip than the onboard serial


if you have no problems then go that route


if you still have serial issues then it's most likely a OS level issue or the serial xfer (baud rate) is to high or you might have a shared DMA/IRQ with another system device or you need to use hardware handshaking instead of software (xon-xoff)

0 Kudos
Warning Be alert for scammers posting fake support phone numbers and/or email addresses on the community. If you think you have received a fake HP Support message, please report it to us by clicking on "Flag Post".
† The opinions expressed above are the personal opinions of the authors, not of HP. By using this site, you accept the Terms of Use and Rules of Participation