I've added some features and improved the tuning ability of all Viper200H and Step2Linear drives .
Email me for how to return to have the firmware updated. Its free, just pay the shipping.
Note : send my mail, not couriers. Check my website for details on returning for repair.
Larry K
Larken@storm.ca
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Manufacturer of CNC routers and Viper Servo Drives
www.LarkenCNC.com and www.Viperservo.com