44x/EN AP/Hb6
-132 MiCOM P40 Agile
7 RTS “Ready To Send” is permanently tied high by the hardware since
InterMiCOM requires a permanently open communication channel.
8 Not used -
9 Not used -
Table 11: InterMICOM D9 port pin-out connections
Depending on whether a direct or modem connection between the two relays in the scheme
is being used, the required pin connections are described below.
5.6.1.6 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 fiber optic convertors, such as
the CILI 204. Depending upon the type of convertor and fiber used, direct communication
over a few kilometres can easily be achieved.
Figure 96: Direct connection within the local substation
This type of connection should also be used when connecting to multiplexers which have no
ability to control the DCD line.
5.6.1.7 Modem Connection
For long distance communication, modems may be used in which the case the following
connections should be made.
Figure 97: InterMICOM teleprotection via a MODEM link
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 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.
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