Communication Test; Termination Board Test; Figure 5-8 Oeu Termination Strip - ABB XSeries G4 6200 User Manual

2) On the OEU G4 EX side of the termination strip (see Figure 5–8), measure
3) On the OEU termination strip, measure the transmitting data voltage
4) Repeat steps 1 through 3 on the transceiver side of the termination strip.
5) If any inaccuracy exists, investigate wiring errors.
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.
Page 5–20
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.
the request to send voltage between terminals:
When the G4 EX is sending communication data to WinCCU, the voltage
should be +5 VDC.
between terminals:
When the data is being transmitted from the G4 EX unit, the voltage should
vary between -5 VDC and +5 VDC.
Figure 5–8 OEU termination strip
GND and RTS
GND and TXD
2104349 rev. AD