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350 Cable Survey System
DPN 402197 © TSS (International) Ltd Page 8 of 30
External logging and internal logging use different data formats that are not compatible
with each other. You cannot use the SDC to ‘replay’ an externally logged file.
DeepView for Windows allows you to configure an SDC serial port for communication
with the external data logger. This option is covered in Section 6.2.2.2. Refer to the
technical manual of your data logger for the correct communication parameters.
7.3 DATA FORMATS
This section describes both the external format and the sentences used internally.
7.3.1 External Logging Format
The output from the SDC to a data logger includes a Quality Control flag and identifi-
cation codes generated by the 350 System. Post-processing engineers can use this
additional information to modify the plot of the target profile to identify areas where
the flag is set.
This simple facility allows a rapid visual analysis of the information, and quickly shows
any areas where the engineers should examine the data more closely.
The quality control flag does NOT mean that the measurements contain errors. It
merely indicates to the post-processing team that the vertical range to target or the lat-
eral offset has exceeded pre-defined limits. The post-processing engineers can use
this flag to help them analyse the acquired data more easily.
7.3.1.1 Co-ordinates and Signals Format
In survey mode, the following sentence is transmitted.
Table 7–1: External Output format - Survey Mode
Notes:
1. The Start character is a colon – ASCII 3Ah.
2. ‘S’ (ASCII 60h) identifies survey mode packet.
3. The Quality Control (QC) flag will be a space character when RESET, or a ques-
tion mark (? – ASCII 3Fh) if set. See also the QC code later in this packet.
:SQ±LLLL VVVV AAAA±CCCC±SSS 1111 2222 3333 4444 5555 6666 QQ[CR][LF]
S
tart character
(Note 1)
Packet identifier
(Note 2)
Space character
Space character
Space character
Space character
Space character
Space character
Space character
Space character
Space character
QC check code
(Note 10)
Lateral offset
(Note 4)
Vertical range to target
(Note 5)
Coil altitude
(Note 6)
Target depth of cover
(Note 7)
Skew angle
(Note 8)
Signal strength on channel 1
(Note 9)
Signal strength on channel 2
(Note 9)
Signal strength on channel 3
(Note 9)
Signal strength on channel 4
(Note 9)
Signal strength on channel 5
(Note 9)
Signal strength on channel 6
(Note 9)
Carriage return line-feed termination
QC flag
(Note 3)
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