Moog Crossbow NAV440 Series - Manual (Page 65)

N 440 User ual
7430‐0131‐01 Rev. F
Page 65 AV Man
Chapter 9. Communicating with the 440Series Units
CommunicationCommands
Communication commands are used to verify a unit is present and alive.
Ping Command
Table 14 Ping Command
Ping (‘PK’ = 0x504B)
Preamble Packet Type Length Termination
0x5555 0x504B ‐ ‐
The ping command has no payload. Sending the ping command will cause the unit to send a ping response. To
th and CRC fields are not required. facilitate human input from a terminal, the leng
Example: 0x5555504B009ef4 or 0x5555504B
Ping Response
Table 15 Ping Response
Ping (‘PK’ = 0x504B)
Preamble Packet Type Length Termination
0x5555 0x504B 0x00 <CRC (U2)>
The unit will send this packet in response to a ping command.
Echo Command
Table 16 Echo
Echo (‘CH’ = 0x4348)
Preamble Packet Type Length Payload Termination
0x5555 0x4348 N <echo payload> <CRC (U2)>
The echo command allows testing and verification of the communication link. The unit will respond with an echo
response containing the echo data. The echo data is N bytes long.
Echo Response
Table 17 Echo Payload
Echo Payload Contents
Byte
ffset O
Name Format Scaling Units Description
0 echoData0 U1 — — first byte of echo data
1 echoData1 U1 — — Second byte of echo data
… … U1 — — Echo data