Scada-Modbus "No Response" Troubleshooting Flow Chart (1 Of 5) - Sigma 980 Operating And Maintenance Manual

980 SCADA-Modbus "No Response" Troubleshooting Flow Chart (1 of 5)

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