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350 Cable Survey System

DPN 402197 © TSS (International) Ltd Page 14 of 18

4.2.2.1 Alternative Communication Methods

WARNING

There is a risk of death or serious injury by electric shock when you work inside the

SDC, the SEP or the PSU.

Only a competent engineer who has the relevant training and experience should open

any part of the 350 System.

Power-off and isolate the equipment from the mains supply voltage before you open

any part of the 350 System. 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.

Many components within the SDC are susceptible to damage due to electrostatic dis-

charge. You must take precautions against such damage: These precautions include

the use of a grounded conductive mat and wrist-strap. TSS (International) Ltd will not

accept responsibility for any damage caused by failure to take such precautionary

measures.

The standard communication link between the SDC and the sub-sea installations of

the 350 System uses RS232. This is suitable for communication up to distances of 15

metres. This method is practical where a multiplexed communication link already

exists between the ROV and the surface vessel, for example where you use a fibre-

optic umbilical cable.

The alternative communication methods are:

❐ 4-wire 20mA digital current-loop

Suitable for use with umbilical cables longer than 1000 metres, or where the qual-

ity of the umbilical cable prevents effective use of the standard 2-wire method.

In practice, the 4-wire method should be suitable for use with umbilical cables up

to 4000 metres long if the umbilical is of good quality.

❐ 2-wire 20mA digital current-loop

If the umbilical cable is of good quality, experience has shown that you may use

this communication method successfully through transmission distances up to

1000 metres.

Configure the SEP

CAUTION

Many components inside the SEP are susceptible to damage due to electrostatic dis-

charge. You must take precautions to prevent such damage whenever you open the

SEP. These precautions include the use of a grounded conductive mat and wrist-strap.

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