IEC10000207 V1 EN-US
Figure 72: Earth selector jumper
The strapping area/jumper P4 selects how internal signal earth and chassis earth are
referenced together. With a jumper between P4's terminals, signal earth and chassis
earth are directly connected. Without a jumper between P4's terminals, signal earth
and chassis earth are connected with a 100 kΩ resistor in parallel with a 100nF
capacitor.
After jumper selection, reassembling is done in the reverse order to above. Do not
forget to reconnect protective earth cables.
5.4.7 Communication structure for laboratory testing
GUID-A1B07E54-B7A3-40E1-85A0-61AA17D03398 v1
During laboratory testing, one transceiver 21-216 has to provide the timing. This is
done by removing the jumper on its S14 EXT CLK. Remember to restore the
jumper after testing.
1MRK 505 382-UEN B Section 5
Communication set-up
Communication set-up 670/650 series 2.2 85
Application Guide
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