Solution:

After finished programming the ADAM-5510/A2 via ADAM-5510/A2 utility (V4.10), the controller will reset itself automatically, so you can see DOS propmt "C:\>" immediately. However, after finished programming the ADAM-5510/A1 via ADAM-5510/A1 utility (V3.02), the controller WILL NOT reset itself automatically, and you'll see the hint to remind you to reset the ADAM-5510/A1. But, after finished programming the ADAM-5510/A1 via ADAM-5510/A2 utility (V4.10), the controller WILL NOT reset itself automatically, and you'll just see "e86 :". Hence, you need to reset the ADAM-5510/A1 manual to RESET the controller.