Adtec digital EN-20 (version 2.03.06) Manual - Manual (Page 38)

How to Use API Commands
The Adtec EN-20 device is unique in that it handles two physical encoders. To accomodate
commands for controlling both encoders, you will need to specify which encoder you are
working with for each command you issue.
Please make the following adjustments:
● Instead of using *.ecmd as noted the API descriptions, you will need to use.
○ *.ecmd0 to specify the first encoder.
○ *.ecmd1 to specify the second encoder.
Example: (*.ecmd0 TRA) will give you the transport status of the first encoder.