We have an old serial port device that will not communicate with it's software properly on an Optiplex 790/7010 running Windows 7 (Enterprise x64). On a Optiplex 755 running Windows 7 (enterprise x64) it works fine. Everything is configured exactly the same in terms of COM port and baud rate and they both have same GPO settings applied, and were imaged from the same base image (different drivers obviously). I've even tried a USB-to-Serial adapter on the 790 and 7010 and it still doesn't work. The serial device lights up when trying to connect via the software, but then errors out, so it's clear there is some form of communication happening, but it's getting cut off. I've tried mapping the serial port to different com ports in the BIOS and device manager to no avail. I've tried on two different 790s and one 7010, all have the same problem. I've tried on two 755s and they both work immediately with all defaults. I've tried on a D630 running Windows XP and that works. So to me there is some hardware/driver difference between the two.
Based on what you've written my initial suspicion would be some sort of incompatibility between the motherboard chipsets used in the Optiplex 790/7010 models and the old serial port device you're trying to use. The Opti 790 has Intel 6 Series Express chipset (Q65) and the 7010 uses Intel 7 Series Express chipset (Q77). The Opti 755 model contains Intel Q35 Express chipset. As for what the specific incompatibility might be, your guess is as good as mine. Perhaps the problem could be resolved by a BIOS update. You may want to try sending a message to one of the Dell forum moderators about this.
Thanks for the reply. I agree, that is what it appears to be. I did install Windows XP on the 790 and it exhibits the same behavior which confirms with near certainty. Obviously it would be good to go the software vendor and see what they could figure out, but since it's unsupported legacy software, it's not an option. I'm surprised that if it is a chipset issue, the usb-to-serial adapter doesn't work. It really has to be a deep-seated design thing that even affects the USB ports. I'm currently trying to use some serial port monitoring software (Sysinternals Portmon) to see if I can glean any useful information.
Are you using a PL-2303HXA based USB adapter?
What exactly is the device?
Did you pre setup the ports to be 9600, 8, N, 1??
Dear Valued Customers & Users,
Please go to our new company website to download the PL-2303 USB-to-Serial drivers from our Support webpage.
Or click here for the new Support webpage. Enter “guest” for both account and password to log-in.
PL2303 Driver Installer v220.127.116.11
Changes from Installer v18.104.22.168:
. Fixed problem when running installer in Windows Server 2003.
. No driver change from previous installer.
Windows 98/ME Driver: v22.214.171.124
Windows 2k/XP/Server2003: v126.96.36.199
Windows Vista/Server2008: 188.8.131.52"
Make sure to install by doing "Run As Administrator"
Windows 7 (32 & 64 bit)
NOTE: For Windows 7, please use RC build 7100 or above.
. USB host controller Device using PL-2303H/HX/X version chip
Supported device ID and product strings:
. VID_067B&PID_2303 for "Prolific USB-to-Serial Comm Port"
Yes it is a prolific PL-2303 HXA adapter, good guess! I am using the latest driver 184.108.40.206. On Windows 7 Windows Update installed whatever driver automatically. The port settings are set as you suggest, defaults. The device is a Escorte Data Transfer Unit as seen on this page: www.eccush.com/detex-escorte. The problem isn't with the USB adapter specifically, I was just trying that as a troubleshooting method.
Please be warned that counterfeit (fake) PL-2303HX (Chip Rev A) USB to Serial Controller ICs using Prolific's trademark logo, brandname, and device drivers, were being sold in the China market. Counterfeit IC products show exactly the same outside chip markings but generally are of poor quality and causes Windows driver compatibility issues
Prolific recommends following vendor cable brands:
Product: FB1210 USB to 1-port RS-232 Adapter
Good Way Technology Co., Ltd.
Product: Plugable USB to RS-232 DB9 Serial Adapter (PL-2303HX Rev D chipset)
Plugable Technologies (USA & UK Direct)
Or contact our worldwide distributors for other cable product reference and chip samples.
|File Name||Release Date||Version||File Size|
Windows Driver Installer Setup Program
(For PL2303 HXA, XA, HXD, EA, RA, SA, TA, TB versions)
Installer version & Build date: 1.8.0 (2013-2-26)
Windows XP (32 & 64-bit) WDM WHQL Driver: v220.127.116.11 (2/5/2013)
- Windows XP Certified WHQL Driver
- Compatible with Windows 2000SP4 & Server2003
Windows Vista/7/8 (32 & 64-bit) WDF WHQL Driver: v18.104.22.1682 (2/5/2013)
- Windows Vista, 7, 8 Certified WHQL Driver
- Compatible with Windows Server2008/Server2008R2/Server2012
- Driver also available via Windows Update (Vista, 7, 8). Refer to User Manual.
You should be using Windows Vista/7/8 (32 & 64-bit) WDF WHQL Driver: v22.214.171.1242 (2/5/2013)
or are you using xp?