A4498 extension board

[jim-p]

@panshovel

(extension board) B1=A2 (on the A4498) and (extension board) A2=B1 (on the A4498).

No it's (extension board) 1B=A2 (on the A4498) and (extension board) 2A=B1 (on the A4498
They just used a number to specify the coil instead of a letter.
Yes it's confusing.