Areva MiCOM P441 - P44 X;En AD;E44

Update Documentation P44x/EN AD/E44
MiCOM P441, P442 & P444 Page 13/82
3.10.2 Direct Connection
The EIA(RS)232 protocol only allows for short transmission distances due to the signalling
levels used and therefore the connection shown below is limited to less than 15m. However,
this may be extended by introducing suitable EIA(RS)232 to fibre optic convertors, such as
the AREVA T&D CILI203. Depending upon the type of convertor and fibre used, direct
communication over a few kilometres can easily be achieved.
This type of connection should also be used when connecting to multiplexers which have no
ability to control the DCD line.
3.10.3 Modem Connection
For long distance communication, modems may be used in which the case the following
connections should be made.
This type of connection should also be used when connecting to multiplexers which have the
ability to control the DCD line.
With this type of connection it should be noted that the maximum distance between the Px40
relay and the modem should be 15m, and that a baud rate suitable for the communications
path used should be selected. See P443/EN AP for setting guidelines.