Moog Crossbow GNAV540 - Manual (Page 71)

GNAV540 User Manual
7430‐0808‐01 Rev. B Page 71
Error Response
Table 31 Error Response
Error Response (ASCII NAK, NAK = 0x1515)
Preamble Packet Type Length Payload Termination
0x5555 0x1515 0x02 <NAK payload> 2)> <CRC (U
T
c
he unit will send this packet in place of a normal response to a failedInputPacketType request if it could not be
ompleted successfully.
NAK Payload Contents
Byte
ffset O
Name Format Scaling Units Description
0 failedInputPacketType U2 — — the failed request
Output Packets (Polled)
The following packet formats are special informational packets which can be requested using the GP command.
Identification Data Packet
Table 32 ID Data Packet
Identification Data (‘ID’ = 0x4944)
Preamble Packet Type Length Payload Termination
0x5555 0x4944 <ID <CRC (U2)> 5+N payload>
This packet contains the unit serialNumber and modelString. The model string is terminated with 0x00. The model
string contains the programmed versionString (8‐bit ASCII values) followed by the firmware part number string
delimited by a whitespace.
Table 33 ID Payload Contents
ID Payload Contents
Byte
ffset O
Name Format Scaling Units Description
0 serialNumber U4 — — Unit serial number
4 modelString SN — — Unit Version String
4+N 0x00 U1 — — Zero Delimiter
Version Data Packet
Table 34 Version Data PKT
Version Data (‘VR’ = 0x5652)
Preamble Packet Type Length Payload Termination
0x5555 0x5652 5 <VR payload> <CRC (U2)>