
4 – Electrical Installation
DPN 402197 © TSS (International) Ltd Page 13 of 18
The following tables show the connections that you must make between the SEP and
the SDC for each of the three communication methods. Refer to sub-section 4.1.3
and Table 4–4 on page 13 for details of the connections that you must make between
the SEP and the ROV electrical distribution system.
To use current-loop communications you must reserve either one or two conductor
pairs in the ROV umbilical for the exclusive use of the 350 System. The System
includes a cable that you should use to connect the ‘COMMS FROM POD’ port on the
SDC to the twisted pairs in the ROV umbilical. The cable has a 15-way D-type con-
nector for connection to the SDC ‘COMMS FROM POD’ port, and open tails for con-
nection to the umbilical at a junction box.
See Tables 4–4 to 4–6 for the connection details of the 15-way D-type connector fit-
ted to this cable.
When you connect the communication cable to the SDC, ensure that the supplied
jumper cable is fitted between the ‘RS232 TO COM1’ and the ‘COM1’ port on the
SDC.
If you use RS232 communications through an existing multiplexed link, you may con-
nect directly from your de-multiplexer to the SDC ‘COM1’ at the 9-way D-type connec-
tor.
Table 4–4: Power and Communications cable – 2-wire current loop connections
SEP Power/Comms port
Pin number
Function
SDC ‘COMMS FROM POD’
(15 way) pin connection
4
5
CL-
CL+
Ù
ROV umbilical
3
4
Table 4–5: Power and Communications cable – 4-wire current-loop connections
SEP Power/Comms port
Pin number
Function
SDC ‘COMMS FROM POD’
(15-way) Pin connection
4
5
CL+ Input
CL- Input
Ù
ROV umbilical (Tx in SDC)
3
4
6
7
CL+ Output
CL- Output
(Tx in SEP) 5
6
Table 4–6: Power and Communications cable – RS232 connections
SEP Power/Comms port
Pin number
Function
SDC ‘COMMS FROM POD’
(15-way) Pin connection*
4
5
Tx output from SEP
Rx input to SEP
Ù
Data cable
3
4
6 Common 5
* You may connect RS232 communications directly to the 9-way D-type serial communication port COM1 on
the SDC.
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