
350 Cable Survey System
DPN 402197 © TSS (International) Ltd Page 14 of 30
direction. The field will contain question marks if the 350 System cannot measure
the skew angle.
B) Signals Data Packet (both operating modes)
The string is 34 characters long with individual field definitions as follows. The SDC
logs all signal voltages in units of microvolts.
Table 7–7: Internal logging format – Signals packet
Notes:
1. The Start character is a colon.
2. The signal strengths, in microvolts, measured on channel 1 (starboard lateral –
SL), channel 2 (starboard vertical – SV), channel 3 (port lateral – PL), channel 4
(port vertical – PV), channel 5 (starboard fore-aft – SF) and channel 6 (port fore-
aft – PF).
Information included in the above signal strength fields may have a very large
dynamic range, extending from less than 1µV to more than 7 volts. To allow for
simple encoding of this range, the System displays and logs values using the sci-
entific notation explained on page 9.
Each time the SEP receives a single carriage-return line-feed sequence from the
SDC, it transmits either packet ‘A1’ or packet ‘A2’, followed immediately by packet
‘B’.
7.3.3 Altimeter Data Format
You may use certain types of altimeter manufactured by Datasonics, Ulvertech, Sim-
rad and OSEL with the 350 System.
Refer to sub-section 4.1.5 for instructions to connect one of these alternative types of
altimeter to the SDC. You may connect the Datasonics unit either to the SDC ‘ALTIM-
ETER’ COM2 port or directly to the SEP ‘Altimeter’ port.
You must configure the display software to use your altimeter type. Refer to the
instructions in sub-section 6.2.2.1 for instructions to do this.
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