IEC07000158-1-en.vsdx
Transceiver
21-219
TX
RX
SDH
MUX
RX
TX
BNC contacts with the
screen connected directly to
chassis (earth)
Make sure the boxes are
properly earthed with shortest
possible connections to, for
example, an earthed frame
Important: power supply
from the same battery
Earthing
screw on
front
Coaxial cables
< 10 m
IEC07000158 V1 EN-US
Figure 81: Earthing principles
5.5.8 Communication structure for laboratory testing
GUID-EEB88BED-45BA-4C38-BAEE-0DECCB003314 v1
During back-to-back laboratory testing, one transceiver 21-219 must be set as
master. This is done by turning the rotary switch on the transceiver's front panel to
position 1 (EXT CLK) (LED 1 is lit and LEDs 2, 4 and 8 are not lit).
5.6 Communication status and fault tracing
5.6.1 Communication status on the line differential protection IED
GUID-36DB09A7-DFD0-4E5A-9475-6FBF9D1BACB2 v1
Communication status can be monitored on the line differential protection IED's
local HMI under Main menu/Test/Function status/Communication/Remote
communication. The information is also useful for fault tracing purposes.
Section 5 1MRK 505 382-UEN B
Communication set-up
94 Communication set-up 670/650 series 2.2
Application Guide
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