Prolific USB-to-Serial Comm Port significantly slower under Windows 7 comparing to Windows XP

Posted by Dmitry S on Super User See other posts from Super User or by Dmitry S
Published on 2011-03-07T07:26:12Z Indexed on 2011/03/07 8:12 UTC
Read the original article Hit count: 451

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serial-port

I am using a Prolific USB-to-Serial adapter based on the Prolific chip to use with a device on serial port. I have the latest version of the driver installed: 1.3.0 (2010-7-15).

When I use my device with this adapter on my main Windows 7 (32bit) system it takes 8-9 seconds to send a command through to the device. However, when I do the same thing on a different Windows XP system (an old laptop I borrowed for testing) it only takes 2-3 seconds. I have made sure that the port settings and other variables are the same between systems. I also tested on a third laptop (also running Windows 7) and again got a significant delay.

So the question is if anyone else experienced the same problem and found a solution. I would like to avoid moving to an XP system for what I need to achieve so that's my last option.

Prolific USB-to-Serial Comm Port significantly slower under Windows 7 comparing to Windows XP

Posted by Dmitry S on Server Fault See other posts from Server Fault or by Dmitry S
Published on 2011-03-07T07:25:43Z Indexed on 2011/03/07 8:12 UTC
Read the original article Hit count: 451

Filed under:

Windows

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windows-7

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windows-xp

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usb

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serial-ports

Not sure if this question should be asked here or on SuperUser but if we get an answer here it may be useful for others here

I am using a Prolific USB-to-Serial adapter based on the Prolific chip to use with a device on serial port. I have the latest version of the driver installed: 1.3.0 (2010-7-15).

When I use my device with this adapter on my main Windows 7 (32bit) system it takes 8-9 seconds to send a command through to the device. However, when I do the same thing on a different Windows XP system (an old laptop I borrowed for testing) it only takes 2-3 seconds. I have made sure that the port settings and other variables are the same between systems. I also tested on a third laptop (also running Windows 7) and again got a significant delay.

So the question is if anyone else experienced the same problem and found a solution. I would like to avoid moving to an XP system for what I need to achieve so that's my last option.

Thanks in advance.

Developer IT