Need to set keyboard priority.
KBD300A Keyboard all versions
CM6800 Matrix Switcher all versions
Priority levels need to be set.
1. Press the PGM key. At the prompt, enter the password (default is 2899100). The CM6800 Main Menu appears.
2. Select PRIORITY. The Set Keyboard Priority Menu screen appears.
3. For each keyboard connected to the specified port, assign a priority level (01-08).
Level 1 = highest priority
Level 8 = lowest priority
4. Select RETURN, and RETURN again.
The lowest level or keyboards located at the same level will access devices on first-come, first-served basis.