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Table 5–4 RS-485 field wiring on the G4 EX termination board
Description
J19 – COMM 1
Pin 1
V-Battery
Pin 2
Ground
Pin 3
Switched VBATT
Pin 4
Operate Comm1
Mirror Request to
Pin 5
Send
Pin 6
Receive Bus (+)
Pin 7
Receive Bus (-)
Pin 8
Receive Bus (+)
Pin 9
Receive Bus (-)
5.4.11.1
1) Using an oscilloscope, measure the line driver voltage on the termination
2) Using an oscilloscope, measure the remote request to send voltage on the
3) If any inaccuracy exists, investigate the wiring errors or damaged wires.
2104349 rev. AD
ABRV
VBATT
GND
COMM1SW
Operate Comm1
RRTS COMM1
TBUS(+)
TBUS(-)
RBUS(+)
RBUS(-)
Step-by-step instructions
When troubleshooting RS-485 mode, verify the settings on
COMM 1 SW1 and COMM 2 SW2 on the termination board
are configured properly (see Figure 5–4).
Voltage on the following steps may be difficult to see using a
Digital Multi-meter. If available, an oscilloscope will provide
a more accurate reading. To verify, the WinCCU software
must continuously be polling the meter.
Generally speaking, these tests
termination board will only verify incorrect or damaged
wiring. If all previous testing passed and all wiring, jumper
and terminations have been verified correct, the termination
board may need to be replaced but does not typically fail.
Contact Totalflow Customer Service. See the Getting Help
section for instructions.
board, J19 and J20, between:
COMM1, J19–Pin 9 (BUS-) and Pin 8 (BUS+) or
COMM 2, J20–Pin 8 (BUS+) and Pin 9 (BUS-)
When the unit is receiving data from WinCCU, voltage should vary between
+5 VDC and 0 VDC. This indicates that the unit is receiving data.
termination board J19. On J20, RRTS is not directed:
COMM 1, J19–Pin 2 (GND) and Pin 5 (RRTS)
When the unit is transmitting receiving data, the voltage should vary
between -5 VDC and +5 VDC. This would indicate that the RRTS is working
correctly.
Description
ABRV
J20 – COMM 2
V Battery
VBATT
Ground
GND
Switched VBATT
COMM2 SW
Operate Comm2
Operate Comm2
Mirror Request to
RRTS COMM2
Send
Receive Bus (+)
TBUS(+)
Receive Bus (-)
TBUS(-)
Receive Bus (+)
RBUS(+)
Receive Bus (-)
RBUS(-)
performed on the
Page 5–21
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Troubleshooting
