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Appendix E
Page 143
SCADA-Modbus® System Guidelines
980 SCADA-Modbus “No Response” Troubleshooting Flow Chart (1 of 5)
No response to
polling Message.
Continued on sheet 2.
Apply power and turn the
Meter on by pressing
the "ON" button.
Determine the flash
(embedded) code version by
turning the meter off and then
back on again and observing
the value on the display.
Apply power and turn the
Meter on by pressing
the "ON" button.
Change the protocol of the
Master device to
Modbus ACSII.
Obtain a protocol converter
to convert from the existing
protocol to Modbus ACSII.
Is the 980 turned on
and power applied?
Is this the
first time this meter has
ever been used with
Modbus?
Is the protocol
of the Master device
Modbus ACSII?
Can the
protocol of the
Master device be changed
to Modbus ACSII?
Has the meter
worked with
Modbus before?
YES
YES
YES YES
NO
NO
NO NO
NO
NO