
Page 5
–20
2104349 rev. AD
When the data is being transmitted to the G4 EX unit, the voltage should
vary between -5 VDC and +5 VDC.
When the unit is receiving data from WinCCU, the voltage should vary
between -5 VDC and +5 VDC. This would indicate that the unit is receiving
data.
2) On the OEU G4 EX side of the termination strip (see Figure 5
–8), measure
the request to send voltage between terminals:
GND and RTS
When the G4 EX is sending communication data to WinCCU, the voltage
should be +5 VDC.
3) On the OEU termination strip, measure the transmitting data voltage
between terminals:
GND and TXD
When the data is being transmitted from the G4 EX unit, the voltage should
vary between -5 VDC and +5 VDC.
4) Repeat steps 1 through 3 on the transceiver side of the termination strip.
5) If any inaccuracy exists, investigate wiring errors.
Figure 5
–8 OEU termination strip
5.4.10 RS-485 communication test
The following RS-485 serial communication test procedure is directed from Figure
5
–7 and will assist the user in what may be the possible cause for an indicated
error message.
With the exception of the field wiring directly on the G4 EX termination board, all
other wiring is located inside the 6270 OEU enclosure. As such, there are two
separate procedures required for testing.
5.4.11 RS-485 termination board test
Before performing this test on the termination board, verify that the wiring is
correct.
Содержание XSeries G4 6200
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