Moog Crossbow GNAV540 - Manual (Page 68)

P
GNAV540 User Manual
7430‐0808‐01 Rev. B
age 68
Interactive Commands
Interactive commands are used to interactively request data from the GNAV540 unit, and to calibrate or reset the
unit.
Get Packet Request
Table 18 GP Request
Get Packet (‘GP’ = 0x4750)
Preamble Packet Type Length Payload Termination
0x5555 0x4750 0x02 <GP payload> <CRC (U2)>
This command allows the user to poll for both measurement packets and special purpose output packets including
T0, VR, and ID.
Table 19 GP Payload
GP Payload Contents
Byte
ffset O
Name Format Scaling Units Description
0 requestedPacketType U2 — — The requested packet type
Refer to the sections below for Packet Definitions sent in response to the ‘GP’ command
Algorithm Reset Command
Table 20 Algorithm Reset Command
Algorithm Reset (‘AR’ = 0x4152)
Preamble Packet Type Length Payload Termination
0x5555 0x4152 0x00 — <CRC (U2)>
This command resets the state estimation algorithm without reloading fields from EEPROM. All current field values
will remain in effect. The unit will respond with an algorithm reset response.
Algorithm Reset Response
Table 21 Algorithm Reset Response
Algorithm Reset (‘AR’ = 0x4152)
Preamble Packet Type Length Termination
0x5555 0x4152 0x00 <CRC (U2)>
The unit will send this packet in response to an algorithm reset command.
Software Reset Command
Table 22 Software Reset Command
Software Reset (‘SR’ = 0x5352)
Preamble Packet Type Length Payload Termination
0x5555 0x5352 0x00 — <CRC (U2)>