Teledyne 440, System Manual, Page: 127 / 256

6 – Operating Procedure
DPN 402196 Issue 4.1 © Teledyne TSS 6- 23
6.4.1.1 External Logging Format
A) Co-ordinates and Signals Format
NOTE
The external output can be configured to output in centimetres or millimetres.
When configuring external equipment, be aware that the resolution used has an
effect on the formatting and length of the external output string.
The SDC logs all distances in units of centimetres or millimetres dependent upon output resolution and
signal voltages 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 6-1: External Co-ordinates and signals format - cm resolution
Notes:
1. ‘T’ (ASCII 54h) identifies a signals and co-ordinates data packet. ‘I’ (ASCII 49h) identifies co-
ordinates only packet.
2. 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.
3. The lateral offset (LAT) is measured from the centre of the coil array in centimetres. 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.
4. 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 centimetres. 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
: T Q+/-000 000 000+/-000+/-00000+/-00000+/-00000+/-00000 QQ[CR][LF]
Lateral
Of
fset
(see
Note
3)
Quality
Control
Flag
(see
Note
2)
Packet
Identifier
(see
Note
1)
S
tart
Character
(ASCII
3AH)
S
p
ace
Character
S
p
ace
Character
V
ertical
Range
to
T
arget
(VR
T)
(see
Note
4)
Altitude
(see
Note
5)
Depth
of
Coverage
(see
Note
6)
Coil
Signal
S
trengths
(see
Note
7)
S
p
ace
Character
Quality
Control
Check
Code
(see
Note
8)
CR/LF
T
ermination