974-72007001/1.0 1007D Altimeter Operators Manual
Page 20 Telemetr
Kongsberg Mesotech Ltd.
Port Coquitlam, BC - Canada
where “ddddd” is the two-way time of the acoustic echo of the
first return. It is always 5 characters long, with leading zeros
as required. This time is in units of 11.3932 seconds and can
be converted to depth by:
depth = ddddd * 11.3932 * sound velocity / 2000000
The leading ‘+’ sign can be used to detect the start of the
output data string. When no valid reply has been detected or
the depth is greater than the maximum range, the value
“ddddd” will be zero. The line of characters is terminated by a
carriage-return, line-feed.
4.1.2 Downlink Messages
The following ASCII single-character commands are
recognized by the altimeter configured for 808 mode
operation:
Ctrl-S (XOFF) Pause
Ctrl-Q (XON) Resume
NOTE: Because the telemetry is not true full duplex in
RS485 mode, these messages must be sent
immediately after uplink range messages are
received. Downlink will be ignored while uplink is
progress.
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