C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Datamaster link issue.

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Old Apr 6, 2011 | 05:56 PM
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Default Datamaster link issue.

PCM sync is intermittent. It will record, then stop, recycle, then record etc etc.
AKMCable for 8 years. New laptop, WXP 32 bit, same as last laptop.
COM3 is in use. D
evice manager has USB to serial settings as
9600 bits per second, 8 data bits, parity none, stop bits 1, flow control none.
Advanced settings: receive and transmit 4096, latency time 1 msec, minimum read/write 0, and serial enumerator only box checked.

Datamasters settings: y car auto
Serial data acquisition box, when trying to record , Under advanced under options, Serial communication timing left to right, 180 180 500 and 1 (last is ALDL link timing.
Any idea where to start. Old laptop worked fine but crashed hard. New laptop is same OS, just newer.
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Old Apr 6, 2011 | 06:44 PM
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90/91 by any chance or a different year?
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Old Apr 6, 2011 | 08:35 PM
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Originally Posted by Sandpiper59
90/91 by any chance or a different year?
nope, 93
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Old Apr 6, 2011 | 08:40 PM
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K, can't help you then
Still, sounds like the timing issues that plague 90's (until you get all the numbers perfect, a 90 does exactly what you describe, known problem for just that 2 years). Something in your new PC isn't timing the same as the old one, might be a poor quality USB port, firewall settings, IRQ conflicts yada yada yada...

Good luck!
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Old Apr 6, 2011 | 08:46 PM
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Originally Posted by Sandpiper59
K, can't help you then
Still, sounds like the timing issues that plague 90's (until you get all the numbers perfect, a 90 does exactly what you describe, known problem for just that 2 years). Something in your new PC isn't timing the same as the old one, might be a poor quality USB port, firewall settings, IRQ conflicts yada yada yada...

Good luck!
I am hoping TTS replies to my email.
This laptop has the same software etc, same OS as my last one, so why it doesnt work is beyond me.
The only difference is the version of TTS. This is 4.0, and the last was 3.4
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Old Apr 6, 2011 | 08:51 PM
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Mine is a 90 but I had the same problem until I turned off CCM handshake and digital dash refresh. Then it logged like a champ.
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Old Apr 6, 2011 | 08:53 PM
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Originally Posted by MyFirst90coupe
Mine is a 90 but I had the same problem until I turned off CCM handshake and digital dash refresh. Then it logged like a champ.
I will give that a try. Never had to before.
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Old Apr 6, 2011 | 10:24 PM
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SOLVED: Disabled CCM handshake and Data refresh.
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Old Apr 7, 2011 | 07:24 AM
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I'm glad that worked for you too!

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