Appendix E Modbus RTU Communication Protocol
D02706R02.30
L-PRO 4000 User Manual
Appendix E-5
Read Holding Registers (Function Code 03)
Channel
Address
Units
Scale
L-PRO Clock Time (UTC). Read all in same query to ensure consistent time reading data
Milliseconds Now
40001
0-999
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 Now
40008
0-999
1
Seconds Now
40009
0-59
1
Minutes Now
40010
0-59
1
Hours Now
40011
0-23
1
Day of Year Now
40012
1-365 (up to 366 if leap year)
1
Years since 1900
40013
90-137
1
Sync’d to IRIG-B
40014
0: No 1: Yes
1
Offset of UTC to IED time.
40015
2’s complement half hours,
North America is negative
1
Channel
Address
Units
Scale
Line Va Magnitude
40257
kV
10
Line Va Angle
40258
Degrees
10
Line Vb Magnitude
40259
kV
10
Line Vb Angle
40260
Degrees
10
Line Vc Magnitude
40261
kV
10
Line Vc Angle
40262
Degrees
10
Line Ia Magnitude
40263
A
1
Line Ia Angle
40264
Degrees
10
Line Ib Magnitude
40265
A
1
Line Ib Angle
40266
Degrees
10
Line Ic Magnitude
40267
A
1
Line Ic Angle
40268
Degrees
10
I2a Magnitude
40269
A
1
I2a Angle
40270
Degrees
10
I2b Magnitude
40271
A
1
I2b Angle
40272
Degrees
10
I2c Magnitude
40273
A
1
I2c Angle
40274
Degrees
10
I3a Magnitude
40275
A
1
I3a Angle
40276
Degrees
10
Summary of Contents for L-PRO 4000
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