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350 Cable Survey System

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5.3.2 Communication ports

Define the serial communication ports and their communication parameters. The SDC

uses the serial communication ports to communicate with the SEP and with external

devices such as the sub-sea altimeter and a data logger.

During System Configuration the only port that you have to specify is the Communica-

tion to the Sub Sea Electronic Pod (or SEP). Below is outlined a list of the COM Ports

and their default assignments.

The SDC has five serial communication ports that it uses to communicate with exter-

nal and peripheral equipment. The standard assignations for these ports are as fol-

lows. You may change these if necessary.

❐ COM1 is used to pass serial communications between the SEP and the SDC.

DeepView uses a serial port for this purpose even if you set the 350 System to

use current-loop communications. The SDC includes the hardware necessary to

convert between these standards.

Note that the current-loop communications connects through a jumper link from the

current-loop converter card. If you decide to use an alternative serial communications

port for the primary communications circuit, then you must also move the link connec-

tion to the alternative serial port.

❐ COM2 (labelled ‘ALTIMETER’ on the rear connector panel of the SDC) is used to

accept serial data from any compatible altimeter that is not connected directly to

the SEP. The maximum range for RS232 communications is 15 metres. There-

fore, to connect an altimeter to the SDC you must add its signals to an existing

multiplexed data link in the ROV umbilical and then extract them at the surface.

Refer to sub-section 6.2.2.1 for instructions to configure an altimeter and set its

communication parameters.

❐ COM3 (labelled ‘LOG O/P’ on the rear connector panel of the SDC) is used to

connect the SDC to a separate user-supplied data logger. You should use a data

logger to record the survey measurements acquired by the 350 System. Refer to

sub-section 6.2.2.2 for instructions to configure DeepView for data logging and to

set appropriate communication parameters.

❐ COM5 (is not available on the rear connector panel of the SDC) is used by the

SDC to communicate with the video overlay card.

DeepView for Windows allows you to set the communication parameters for each of

the serial ports. Choose settings that are appropriate for the connected equipment –

refer to the technical manuals of the attached equipment if necessary. Note that the

standard communication parameters for COM1, the communication link between the

SDC and the SEP are set to operate at 9600 baud using 8 data bits, two stop bits and

no parity.

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