SeaTrac Serial Command Interface Reference
Page 112
8.2.2.
CID_ECHO_REQ
The CID_ECHO_REQ status message is generated when the beacon received an acoustic ECHO
message from the sending beacon. This message is provided by the protocol-handler in the
beacon for information purposes only, and no action or acknowledgment by the external
system/user is required.
This message is a status message that may be sent by the beacon at any time (not in
response to a command message) depending on acoustic activity triggering a
transceiver event.
Status Message Parameters
Parameter Type Description
MSG_ID
Command identification code (CID_ECHO_REQ)
ACO_FIX
A Fix structure containing information relating to
signal from the beacon sending data.
This will not contain range or position information.
ECHO_LEN
UINT8
The number of bytes sent in the Echo acoustic
packet. Valid values are from 0 to 31.
ECHO_DATA
UINT8[x]
The array of data received in the Echo acoustic
packet, where “x” is the value specified in
ECHO_LEN.
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