Spatial FOG Reference ManualPage 89 of 144Version 2.303/05/201812.4.9 Topcon GNSS InputThis function is designed for interfacing Spatial FOG with a Topcon GNSS receiver. Itaccepts data in the GRIL TPS binary format and expects messages PG and VG at rateshigher than 1 Hz.12.4.10 ANPP InputThis function accepts data in the ANPP format as specified in section 13. All ExternalData packets are accepted as input as well as the RTCM diferential corrections packet.12.4.11 ANPP OutputThis function outputs data in the ANPP format as specified in section 13. Packets cannot be requested using this function, it is for ANPP peripheral devices only.12.4.12 Disable GNSSThis function accepts a digital input with a low state enabling the GNSS and a highstate disabling the GNSS.12.4.13 Disable PressureThis function accepts a digital input with a low state enabling the atmosphericpressure sensor and a high state disabling the atmospheric pressure sensor.12.4.14 Set Zero Orientation AlignmentThis function accepts a digital input. The input is normally low and a transition fromlow to high causes Spatial FOG to set it's alignment so that the current orientation iszero. Due to the risk of exhausting the fash cycles, the change is not permanent andwill disappear on reset. To make it permanent the Installation Alignment Packet mustbe read and then sent back to Spatial FOG with the permanent fag set. This functionrequires de-bouncing if attached to a switch.12.4.15 System State Packet TriggerThis function accepts a digital input. The input is normally low and a transition fromlow to high causes Spatial FOG to send the system state packet. This function requiresde-bouncing if attached to a switch.12.4.16 Raw Sensors Packet TriggerThis function accepts a digital input. The input is normally low and a transition fromlow to high causes Spatial FOG to send the raw sensors packet. This function requiresde-bouncing if attached to a switch.12.4.17 RTCM Diferential GNSS Corrections InputThis function accepts RTCM diferential GPS corrections. This allows for DiferentialGNSS or RTK with Spatial FOG's internal GNSS receiver.
