Teledyne 440, System Manual, Page: 135 / 256

6 – Operating Procedure
DPN 402196 Issue 4.1 © Teledyne TSS 6- 31
NOTES
❐
The Start character is a colon – ASCII 3Ah.
❐
The number of coils fitted to the 440 System is always 3.
❐
Coil altitude (ALT) information comes from an altimeter if the System
includes one. Otherwise this field will contain three space characters and a
zero.
❐
The lateral offset (LAT) is measured from the centre of the coil array. Positive
values indicate a target to starboard of the centre line. The field will contain
question marks if the target is out of range.
❐
The vertical range to target (VRT) is the distance between the bottom face of
the coil array and the top of the conductive part of the target. The field will
contain question marks if the target is out of range.
❐
The slant range is the straight-line distance between the centre of the coil
array to the top of the conductive part of the target:
❐
The target depth of cover COV = VRT – ALT. A positive value indicates the
target is covered. Zero or negative values indicate an exposed target. The
field will contain question marks if the target is out of range.
B) Signals Data Packet
The individual fields definitions for the Signals Data Packet are as follows. The SDC logs all signals in
units of microvolts. The values in the packet are rounded and it is possible that they will not precisely
match those on the Run Display screen.
Table 6-7: Internal signals format
ddd bbb
2
 
ccc
2
 
+
 
=
Event
identificatio
n
(Not
e2
)
:S0000,1111,2222,3333,1111,2222,3333[CR][LF]
Signal
strengh
of
Starboard
coil
(early)
(Not
e4
)
Signal
strengh
of
port
coil
(early)
(Not
e4
)
Signal
strengh
of
Centre
coil
(standard)
(Not
e4
)
Carriage
return
line-feed
terminatio
n
Altimeter
height
above
seabed
(Not
e3
)
Signal
strengh
of
centre
coil
(early)
(Not
e4
)
Signal
strengh
of
Starboard
coi
l(
standard)
(Not
e4
)
Signal
strengh
of
Port
coil
(standard)
(Note
4)