I/O
100kW
100nF
Soft ground
en07000242.vsd
IEC07000242 V1 EN
Figure 544: Schematic view of soft earth
Earthing
Three different kinds of earthing principles can be set (used for fault tracing):
1. Direct earth - The normal earthing is direct earth, connect terminal 2 directly to
the chassis.
2. No earth - Leave the connector without any connection.
3. Soft earth - Connect soft earth pin (3), see figure 543
X.21 connector
Table 924: Pinout for the X.21 communication connector
Pin number
Signal
1 Shield (earth)
2 TXD A
3 Control A
4 RXD A
6 Signal timing A
8 Earth
9 TXD B
10 Control B
11 RXD B
13 Signal timing B
5,7,12,14,15 Not used
21.2.16.3 Functionality
The data format is HDLC. The speed for the transmission of the messages used is 64
kbit/s.
Section 21 1MRK502052-UEN B
IED hardware
1194
Technical manual
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