servo encoder
Hello BabyTiger,
Regarding the nameplate, A and B usually are two square signals shifted 90 degrees (electrical)
Having these two phase shifted signals enables you to determine if your motor turns clockwise or counterclockwise, and could improve resulution up to a 4x.
C is usually a pulse signal activated once per revolution, you can see your C signal as Index Pulse, because is used to set a mechanical reference in systems having incremental encoders.
A', B' and C' are negated versions of A, B and C, so you can detect those signals diferentially in presence of electrical noise.
Hope this helps and best regards!