Examples
Suppose there are 3 boards in the system, addressed 1, 2 & 3. (The blue text is the PC side, the red text is the response from the board(s), and the black text is our comments)
Example #1: Everything goes fine :999 *1 *2 *3
n
(no response as no board is active) :1
A1 Board #1 becomes active n
#1
:2
^2 Responded by board #1. Means: I (board #1) am becoming inactive in favor of board #2, even though it’s unknown for me whether board #2 exists or not.
A2 Responded by board #2. Means: I (board #2) am becoming active, assuming that no other board is active.
(Note: Comments analogue to the above two ones (about ^2 and A2) are relevant also for the other ^x and Ax commands; however, for the sake of readability, the following comments are shorter.)
n #2 :3
^3 Board #2 becomes inactive in favor of board #3 A3 Board #3 becomes active
n #3 :1
^1 Board #3 becomes inactive in favor of board #1 A1 Board #1 becomes active
n #1
63