What's the 5 pin headers of AD-DYNO1-EBZ on the right side?

Dear Sir/Madam,

Do you have the specifications or schematic for 5 pins of AD-DYNO1-EBZ?

I enclosed the picture here.

Please refer to my enclosed picture a circle in red.

I can confirm on the right side wall below.

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1.Gnd

3.Ch.A

2.Index

4.+5v

5.Ch.B

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What does this mean?

Our customer asked this question due to that he buy your AD-DYNO1-EBZ and  AD-FMCMOTCON1-EBZ.

Thanks Kaos