Installation P54x/EN IN/La4
MiCOM P543, P544, P545 & P546
(IN) 15-9
IN
6.2 EIA(RS)485 port
Connections to the EIA(RS)485 port are made using ring terminals. It is recommended that
a 2 core screened cable is used with a maximum total length of 1000 m or 200 nF total cable
capacitance. A typical cable specification would be:
Each core: 16/0.2 mm copper conductors
PVC insulated
Nominal conductor area: 0.5 mm
2
per core
Screen: Overall braid, PVC sheathed
6.3 IRIG-B connections (if applicable)
The IRIG-B input and BNC connector have a characteristic impedance of 50 . It is
recommended that connections between the IRIG-B equipment and the relay are made
using coaxial cable of type RG59LSF with a halogen free, fire retardant sheath.
6.4 EIA(RS)232 front port
Short term connections to the EIA(RS)485 port, located behind the bottom access cover, can
be made using a screened multi-core communication cable up to 15 m long, or a total
capacitance of 2500 pF. The cable should be terminated at the relay end with a 9-way,
metal shelled, D-type male plug. The pin allocations are detailed in section 1.8 of Getting
Started (P54x/EN GS).
6.5 Ethernet port for IEC 61850 (if applicable)
Fiber Optic Port
The relays can have 100 Mbps Ethernet port. Fiber optic connection is recommended for
use in permanent connections in a substation environment. The 100 Mbit port uses type ST
connector, compatible with fiber multimode 50/125 µm or 62.5/125 µm – 13000 nm.
RJ-45 Metallic Port
The user can connect to either a 10Base-T or a 100Base-TX Ethernet hub; the port will
automatically sense which type of hub is connected. Due to possibility of noise and
interference on this part, it is recommended that this connection type be used for short-term
connections and over short distance. Ideally where the relays and hubs are located in the
same cubicle.
The connector for the Ethernet port is a shielded RJ-45. The table shows the signals and
pins on the connector.
Pin Signal name Signal definition
1 TXP Transmit (positive)
2 TXN Transmit (negative)
3 RXP Receive (positive)
4 - Not used
5 - Not used
6 RXN Receive (negative)
7 - Not used
8 - Not used
Table 4: Signals on the Ethernet connector
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