Atop ABLEPick AT500 - 3.2.5 4-digit directional picking tag(AT504 A); 3.2.6 2-digit vertical directional picking tag(AT502 V)

ABLEPick pick-to-light communication protocol
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one will be queued in the buffer. Once the first message has been confirmed, the second
one will pop out to show automatically. That is why it has two arrows to distinguish.
3.2.5 4-digit directional picking tag(AT504A )
AT504A is almost the same as AT503A, except the numbers of digits.
3.2.6 2-digit vertical directional picking tag(AT502V )
AT502V is a vertical design picking tag, which is similar to AT503A. Besides 2-digit