Teledyne 440, System Manual, Page: 70 / 256

5 – Operating Software
5-4 © Teledyne TSS DPN 402196 Issue 4.1
5.2.2 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.
NOTE
During System Configuration the only port that you have to specify is the Commu-
nication to the SEP. Below is outlined a list of the COM Ports and their default
assignments.
The SDC has four serial communication ports that it uses to communicate with external and peripheral
equipment. The standard assignations for these ports are as follows. You may change these if
necessary.
❐ COM1 is used to pass serial communications between the SEP and the SDC.
❐ COM2 on the rear connector panel of the SDC is used to accept serial data from any compati-
ble altimeter that is not connected directly to the SEP. The maximum range for RS232 commu-
nications is 15 metres. Therefore, 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.
See
section 5.3.3.2 "Altimeter" on page 5-20 for instructions to configure an altimeter and set
its communication parameters.
❐ COM3 (labelled ‘LOG O/P (COM3)’ 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 440 System. See
section 5.3.3.3 "External Output" on
page 5-23 for instructions to configure DeepView for data logging and to set appropriate com-
munication parameters.
❐ COM5 is used by the SDC to communicate with the video overlay card. This port is not availa-
ble on the Rear Comms Enclosure but is internally connected to the video overlay interface
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 eight data
bits, two stop bits and no parity.
NOTE
The update rate for your System will reduce if you set a lower baud rate for this
communication link. You should consider reducing the baud rate for this link only if
you experience persistent communication problems caused by an umbilical cable
of poor quality. Ideally, in these circumstances you should swap to using an umbil-
ical cable of good quality instead.
At this point the software will provide an analysis of the data status and will provide you with a
summary screen of the findings that it has established.