Start troubleshooting – Bell & Gossett S13654B Technologic 5500 Series Pump Controller User Manual
Page 20
20
No
No
Correct the wire
connections
Change to correct node
number
Yes
Yes
View “COMMUNICATION” test screen
Is Node number setting
correct?
Range 1 -253
Is RS485 Connection Correct?
Data <-> +; N_data <-> -
Start Troubleshooting
MODBUS TROUBLESHOOTING FLOW CHART
No
Contact Building Control
Manufacturer for the correct
Modbus Slave requirements
Are the B&G
Read/Write counters active
(non-zero)?
Cycle the Control
Panel’s Power
Check node
number
setting.
No
Are the B&G
Read/Write counters active
(non-zero)?
Yes
Modbus drivers are
working
Yes
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