Teledyne 440, System Manual, Page: 129 / 256

6 – Operating Procedure
DPN 402196 Issue 4.1 © Teledyne TSS 6- 25
Table 6-2: External Co-ordinates and signals format - mm resolution
Notes:
1. ‘T’ (ASCII 54h) identifies a signals and co-ordinates data packet. ‘I’ (ASCII 49h) identifies co-
ordinates only packet.
2. When using mm resolution, this field will always show ‘mm’.
3. The Quality Control (QC) flag will be a space character ( ASCII 20h) when RESET or a ques-
tion mark (ASCII 3Fh) if the target is out of range or in saturation or > 90cm lateral offset. See
also the QC check code later in this packet.
4. The lateral offset (LAT) is measured from the centre of the coil array in millimetres. Positive
values indicate a target to starboard of the centre line. The field will contain ‘????’ if the target
is out of range or saturation or >90 cm LAT.
5. 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 in millimetres. If you have entered a weight coating
thickness using the ‘Target Scaling’ feature of the software, VRT measurements will be to the
top of the weight coating. There are several conditions that will cause the field to contain
‘????’:
❐ The target is out of range
❐ The 440 System cannot compute an accurate position for the target
❐ Coil saturation has occurred
NOTE
Although the VRT measurements displayed and logged will be valid to the top of
the weight coating, the 440 System always measures to the top of the conductive
: T mm Q +/-0000 0000 0000+/-0000+/-00000+/-00000+/-00000+/-00000 QQ[CR][LF]
Lateral
Of
fset
(see
Not
e4
)
Quality
Control
F
lag
(see
Note
3
)
Output
Resolution
(see
Note
2
)
Packet
Identifier
(see
Note
1)
S
tart
Character
(ASCII
3AH)
S
p
ace
Character
V
ertical
Range
to
T
a
rget
(VR
T
)
S
p
ace
Character
V
ertical
Range
to
T
a
rget
(VR
T
)
(see
Not
e5
)
Altitude
(see
Note
6
)
Depth
o
f
Coverage
(see
Note
7
)
Coil
Signal
S
trengths
(see
Note
8
)
S
p
ace
Character
Quality
Control
Check
Code
(see
Note
9
)
CR/LF
T
e
rmination