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Appendix D Modbus Functions
Appendix D-4 TESLA LITE User Manual D03283R01.10
External I/P 37 Change latch 10293 0: Off (no change) 1: On (change)
External I/P 38 Change latch 10294 0: Off (no change) 1: On (change)
Read Holding Register (Function Code 03, 4X References
Channel Address Value Scaled up by
Tesla Clock Time (UTC). Read all in same query to ensure consistent time reading data
Milliseconds Now
* Millisecond information
not supported.
40001 0 1
Seconds Now 40002 0-59 1
Minutes Now 40003 0-59 1
Hours Now 40004 0-23 1
Day of Year Now 40005 1-365 (up to 366 if leap year) 1
Years since 1900 40006 90-137 1
Sync’d to IRIG-B 40007 0: No, 1: Yes 1
Time of Acquisition (UTC). Read all in same query to ensure consistent time reading data
Milliseconds Acquisition
* Millisecond information
not supported.
40008 0 1
Seconds Acquisition 40009 0-59 1
Minutes Acquisition 40010 0-59 1
Hours Acquisition 40011 0-23 1
Day of Year Acquisition 40012 1-365 (up to 366 if leap year) 1
Years since 1900 40013 90-137 1
Acquisition Time Sync’d
to IRIG-B 40014 0: No
1: Yes 1
Offset of UTC to IED
Local Time 40015 2’s complement half hours, North America is
negative 1
Analog Magnitude and Angle Metering Channels
Channel Address Value Scaled up by
AI1 Magnitude 40257 0 to 3276.7 units 10
AI1 Angle 40258 -180° to 180° 10
AI2 Magnitude 40259 0 to 3276.7 units 10
AI2 Angle 40260 -180° to 180° 10
AI3 Magnitude 40261 0 to 3276.7 units 10
AI3 Angle 40262 -180° to 180° 10
AI4 Magnitude 40263 0 to 3276.7 units 10
AI4 Angle 40264 -180° to 180° 10
AI5 Magnitude 40265 0 to 3276.7 units 10