I/O
100k
W
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
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
Содержание Relion REG670
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