Communication with Modbus
A43/A44 170 2CMC48001M0201
User Manual Revision: C
00 00 0F CA ;L3-L2 voltage=00000FAChex=4042dec -> 404.2 V
00 00 0F C0 ;L1-L3 voltage=00000FAChex=4032dec -> 403.2 V
00 00 00 65 ;L1 current=00000065hex=101dec -> 1.01 A
00 00 00 C9 ;L2 current=000000C9hex=201dec -> 2.01 A
00 00 01 2E ;L3 current=0000012Ehex=302dec -> 3.02 A
00 00 00 86 ;Neutral current=00000086hex=134dec -> 1.34 A
00 01 E8 E4 ;Active total power=0001E8E4hex=125156 -> 1251.56 W
00 00 5A E2 ;L1 active power=00005AE2hex=23266 -> 232.66 W
00 00 B0 97 ;L2 active power=0000B097hex=45207 -> 452.07 W
00 00 DD 6B ;L3 active power=0000DD6Bhex=56683 -> 566.83 W
00 00 75 41 ;Reactive total power=00007541hex=30017 -> 300.17 var
00 00 00 1C ;L1 reactive power=0000001Chex=23266 -> 0.28 var
FF FF D0 4A ;L2 reactive power=FFFFD04Ahex=-12214 -> -122.14 var
00 00 A4 DB ;L3 reactive power=0000A4DBhex= 42203 -> 422.03 var
00 02 25 C3 ;Apparent total power=000225C3hex=140739 -> 1407.39 VA
00 00 5A E2 ;L1 apparent power=00005AE2hex=23266 -> 232.66 VA
00 00 B6 DF ;L2 apparent power=0000B6DFhex=46815 -> 468.15 VA
00 01 14 02 ;L3 apparent power=00011402=70658-> 706.58 VA
13 83 ;Frequency=1383=4995 -> 49.95 Hz
00 87 ;Total power phase angle=0087=135 -> 13.5 degrees
00 00 ;L1 power phase angle=0000=0 -> 0 degrees
FF 6A ;L2 power phase angle=FF6A=-150 -> -15.0 degrees
01 6F ;L3 power phase angle=016F=367 -> 36.7 degrees
00 00 ;U1 phase angle=0000=0 -> 0 degrees
04 AF ;U2 phase angle=04AF=1199 -> 119.9 degrees
FB 4E ;U3 phase angle=FB4E=-1202 -> -120.2 degrees
FF FF FF FF FF FF ;FF FF FF…… means no data available at these addresses
FF F3 ;I1 phase angle=FFF3=-13 -> -1.3 degrees
04 09 ;I2 phase angle=0409=1033-> 103.3 degrees
FC AE ;I3 phase angle=FCAE=--850 -> -85.0 degrees
03 CC ;Total power factor=03CC=972 -> 0.972
03 E8 ;L1 power factor=03E8=1000-> 1.000
03 C6 ;L2 power factor=03C6=966-> 0.966
03 22 ;L3 power factor=0322=802-> 0.802
00 01 ;Total active quadrant=0001=1 -> 1
00 01 ;L1 active quadrant=0001=1 -> 1
00 04 ;L2 active quadrant=0004=4 -> 1
00 01 ;L3 active quadrant=0001=1 -> 1
D7 5E ;Checksum
Below is a readout example of the U1 voltage with comments of byte data sent and received.
Sending Read Request
05 03 5B 00 00 02 D6 AB ;05=Modbus address, 03=Read holding register, 5B 00=Address 5B00hex, 00 02=2
Modbus words=4 bytes
Reading answer
05 03 04 ;05=Modbus address, 03=read holding register, 04hex=4 bytes
00 00 09 05 ;L1-N voltage=00000905hex=2309 -> 230.9V
79 A0 ;Checksum
9.11.3 Writing parameters
Below is examples of setting the current transformer primary current and date/time with comments of byte
data sent and received.
Setting CT primary current to 500
01 10 8C 04 ;01=Modbus address, 10=Write multiple registers, 8C 04=Address 8C04hex
00 02 ;00 02=2 Modbus words
04 ;04=4 bytes
00 00 01 F4 ;00 00 01 F4=000001F4hex=500dec
C6 8D ;Checksum
Reading answer
01 10 8C 04 ;01=Modbus address, 10=Write multiple registers, 8C 04=Address 8C04hex
00 02 ;00 02=2 Modbus words
2A 99 ;Checksum
Setting Date/Time to 2018-09-23/12:53:16
01 10 8A 00 ;01=Modbus address, 10=Write multiple registers, 8A 00=Address 8A00hex
00 03 ;00 03=3 Modbus words