E84 & OHT function support

•VALID             Indicates that the signal transition is active and selected

•CS_0              Carrier Stage 0

•CS_1              Carrier Stage 1

•TR_REQ         Transfer Request

•L_REQ            Load Request

•U_REQ           Unload Request

•READY           READY for Transfer

•BUSY              BUSY for Transfer

•COMPT           Complete Transfer

•CONT              Continuous Handoff

•HO_AVBL        Handoff Available

•ES                    Emergency Stop

•VA                    Vehicle arrived

•AM_AVBL        Transfer Arm Available

•VS_0                Carrier Stage 0 from Passive OHS Vehicle