COMMUNICATIONS
Modbus RTU Communication
Mod
R/W
RC
Address Name
Bus
300
R
N
Average Voltage
301
R
N
A-B Voltage
302
R
N
B-C Voltage
303
R
N
C-A Voltage
304
R
N
L-N Voltage
305
R
N
Frequency
306
R
N
Phase Order
307
R
N
Voltage Unbalance 0 to 100.0
308
R
N
A-B Min Voltage
309
R
N
B-C Min Voltage
310
R
N
C-A Min Voltage
311
R
N
Average Current
312
R
N
Phase A Current
313
R
N
Phase B Current
314
R
N
Phase C Current
315
R
N
Ground Current
316
R
N
Current Unbalance 0 to 100.0
317
R
N
Peak Current
318
R
N
Present Real
Power
319
R
N
Present Apparent
Power
320
R
N
Present Reactive
Power
321
R
N
Average PF
42
Choices/Range
The following ranges are scaled by a multiplier (shown in this table as multi = x.x). For
example, if a voltage of 100 V is reported by Modbus as 1000, the user has to multiply
the Modbus value by 0.1 for the actual value of the reading.
0 to 9000.0
multi
= 0.1
0 to 9000.0
multi
= 0.1
0 to 9000.0
multi
= 0.1
0 to 9000.0
multi
= 0.1
0 to 9000.0
multi
= 0.1
45.0 to 66.0
multi
= 0.1
0 - Undefined
1 - A-B-C
2 - A-C-B
multi =
0.1
0 to 1320.0
multi =
0.1
0 to 1320.0
multi=
0.1
0 to 1320.0
multi =
0.1
0 to 14000.0
multi
= 0.1
0 to 14000.0
multi
= 0.1
0 to 14000.0
multi
= 0.1
0 to 14000.0
multi
= 0.1
0 to 14000.0
multi
= 0.1
multi
= 0.1
0 to 14000.0
multi
= 0.1
-2000.0 to 2000.0
multi
= 0.1
-2000.0 to 2000.0
multi
= 0.1
-2000.0 to 2000.0
multi
= 0.1
-1.00 to 1.00
multi =
0.0 1
Description
Average voltage across all phases.
Phase A to Phase B voltage reading
Phase B to Phase C voltage reading
Phase C to Phase A voltage reading
Line-to-neutral voltage reading
Line frequency measurement
Phase Order
Voltage unbalance percentage
Minimum phase-to-phase voltage during the last start
Minimum phase-to-phase voltage during the last start
Minimum phase-to-phase voltage during the last start
Average current among all phases
Phase A current
Phase B current
Phase C current
Ground current
Current unbalance percentage
Peak inrush current during the last start
Real power in kW
Apparent power in kVA
Reactive power in kVAR
Power Factor