3M X21 Operator's Manual page 76

Connection to the ports (continued)
USB
I
Pin Signal
1 +5V
2
3
4 Ground
J CONTROL
please refer to the following page.
Pin Signal
1
2
3
6
J
2 1
4
3
Pin Signal
4
5 Ground
6
3M™ Digital Projector X21/X26
9 8 7 6
5 4 3 2 1
Pin Signal
7 RTS
8
9
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I