Moog Crossbow GNAV540 - Manual (Page 92)

Page 92
GNAV540 User Manual
7430‐0808‐01 Rev. B
Set Fields Command
Table 66 SF Commands
Set Fields (‘SF’ = 0x5346)
Preamble Packet Type Length Payload Termination
0x5555 0x5346 1+numFields*4 <SF payload> <CRC (U2)>
This command allows the user to set the unit’s current configuration (SF) fields immediately which will then be lost
on power down. NumFields is the number of words to be set. The field0, field1, etc. are the field IDs that will be
written with the field0Data, field1Data, etc., respectively. This command can be used to set configuration fields. The
unit will not set calibration or algorithm fields. If at least one field is successfully set, the unit will respond with a set
fields response containing the field IDs of the successfully set fields. If any field is unable to be set, the unit will
respond with an error response.
Both a set fields and an error response may be received as a result of one set fields command. Setting a field with an
invalid value will generate an error response. To view a table of field IDs and valid field values, refer to
Configuration Fields on page 85.
Table 67 SF Payload
SF Payload Contents
Byte Offset Name Format Scaling Units Description
0 numFields U1 — — The number of fields to set
1 field0 U2 — — The first field ID to set
3 field0Data U2 — — The first field ID’s data to set
5 field1 U2 — — The second field ID to set
7 field1Data U2 — — The second field ID’s data to set
… … U2 — — …
numFields*4 ‐3 field… U2 — — The last field ID to set
numFields*4 ‐1 field…Data U2 — — The last field ID’s data to set
Write Fields Response
Table 68 WF Response
Write Fields (‘WF’ = 0x5746)
Preamble Packet Type Length Payload Termination
0x5555 0x5746 1+numFields*2 <WF payload> <CRC (U2)>
The unit will send this packet in response to a write fields command if the command has completed without errors.
Table 69 WF Payload
WF Payload Contents
Byte Offset Name Format Scaling Units Description
0 numFields U1 — — The number of fields written