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4 – Electrical Installation
cation between the SDC and the sub-sea installation passes through the relevant
SDC serial port.
Communication lines between the SDC and the sub-sea components are opto-isolated at both ends.
The following tables show the connections that you must make between the SEP and the SDC for each
of the three communication methods. See
2
for details of the connections that you must make between the SEP and the ROV electrical
distribution system.
Table 4-5: Power and Communications cable – 2-wire current loop connections
SEP Power/Comms
port
Pin number
4
5
Table 4-6: Power and Communications cable – 4-wire current-loop connections
SEP Power/Comms
port
Pin number
4
5
6
7
Table 4-7: Power and Communications cable – RS232 connections
SEP Power/Comms
port
Pin number
4
5
6
The 15-way D-Type labelled "COMMS TO SEP" is internally connected to the Panel PC COM1. Hence all communica-
tions protocols, including RS232, must use the 15-way D-Type.
To use current-loop communications you must reserve either one or two conductor pairs in the ROV
umbilical for the exclusive use of the 440 System. The System includes a cable that you should use to
connect the 'COMMS FROM SEP' port on the SDC to the twisted pairs in the ROV umbilical. The cable
has a 15-way D-type connector for connection to the SDC 'COMMS FROM SEP' port, and open tails
for connection to the umbilical at a junction box.
Previous versions of the SDC required a jumper cable to be fitted between the 15-way D-Type and
COM1 of the SDC. However, the SDC10 internally connects the 15-way D-Type to COM1 and removes
the requirement for the jumper cable.
4-10
section 4.1.3 "Power Supply Pod" on page 4-3
Function
CL-
CL+
ROV umbilical
Function
CL+ Input
CL- Input
ROV umbilical (Tx in
SDC)
CL+ Output
(Tx in SEP)
CL- Output
Function
Tx output from
SEP
Data cable
Rx input to SEP
Common
© Teledyne TSS
and
SDC 'COMMS FROM POD'
(15 way) pin connection
3
4
SDC 'COMMS FROM POD'
(15-way) Pin connection
3
4
5
6
SDC 'COMMS FROM POD'
(15-way) Pin connection*
3
4
5
DPN 402196 Issue 4.1
Table 4-
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