Sensoray 811 - Manual (Page 13)

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LED Signal
D5 Status of GPIO1 (associated with Channel-1)
D6 Status of GPIO2 (associated with Channel-2)
D7 Status of GPIO3 (associated with Channel-3)
D8 Status of GPIO4 (associated with Channel-4)
Power-OK indicators: D9, D10, D11
The LED D9, D10, and D11 are used for indicating on-board Power-OK status.
LED Signal
D9 1.5V Power-OK Status
D10 3.3V Power-OK Status
D11 Power-OK Status for PCI-Express to PCI bridge, PLX PEX8112