Moog Crossbow GNAV540 - Manual (Page 91)

GNAV540 User Manual
7430‐0808‐01 Rev. B Page 91
• If at least one field is successfully written, the unit will respond with a write field response containing the
field IDs of the successfully written fields.
• If any field is unable to be written, the unit will respond with an error response.
Both write fields and an error response may be received as a result of a write fields command. Attempts to write a
field with an invalid value is one way to generate an error response. To view a table of field IDs and valid field
values, refer to Configuration Fields on page 85.
Table 63 WF Payload
WF Payload Contents
Byte Offset Name Format Scaling Units Description
0 numFields U1 — — The number of fields to write
1 field0 U2 — — The first field ID to write
3 field0Data U2 — — The first field ID’s data to write
5 field1 U2 — — The second field ID to write
7 field1Data U2 — — The second field ID’s data
… … U2 — — …
numFields*4 ‐3 field… U2 — — The last field ID to write
numFields*4 ‐1 field…Data U2 — — The last field ID’s data to write
Write Fields Response
Table 64 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 65 WF Payload
WF Payload Contents
Byte Offset Name Format Scaling Units Description
0 numFields U1 — — The number of fields written
1 field0 U2 — — The first field ID written
3 field1 U2 — — The second field ID written
… … U2 — — More field IDs written
numFields*2 – 1 Field… U2 — — The last field ID written