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350 Cable Survey System
DPN 402197 © TSS (International) Ltd Page 16 of 18
All five links have the same identification sequence and must be set identically. DO
NOT FORGET to set the jumper on link LK1, which is located away from links LK2 to
LK5 on the board.
Once you have set all the links, follow the instructions in sub-section 9.2.2 to re-
assemble the SEP.
It is a good idea to keep the links on the spare Processor Board set identically to the
Converter Card in the SDC. This avoids potential communication problems if you need
to replace the Processor Board from the field support kit during a survey.
Configure the SDC
WARNING
There is a risk of death or serious injury by electric shock when you work inside the
SDC or the SEP.
Only a competent engineer who has the relevant training and experience should open
the SDC or the SEP.
Power-off and isolate the equipment from the mains electrical supply before you open
the SDC or the SEP. Observe all relevant local and national safety regulations while
you perform any maintenance work on the 350 System.
Re-fit all safety covers and ground connections to the 350 System before you re-con-
nect the equipment to the mains electrical supply.
You do not need to change the setting on the Converter Card if you use RS232 commu-
nications connected directly to a 9-way D-type serial port of the SDC.
To change the communication method you will need to configure the external switch
on the Current Loop Converter Card of the SDC.
After you have changed the communication method, perform a communications check
between the SDC and the sub-sea installation.
You must perform a communication check as part of the pre-dive tests. Refer to sub-
section 7.2.1 for details of the recommended pre-dive test procedure.
4.2.3 Interface to Data Logger
During normal survey operations, the 350 System acquires data at a rate of approxi-
mately 1MB per hour. You should arrange to record the official survey log on a suita-
ble data logger.
4-wire 20mA digital current-loop C
2-wire 20mA digital current-loop (standard) D
Table 4–7: Link settings for LK1 to LK5
Communication method Pin pairs (see Figure 4–3)
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