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Modbus communication
Read Limits: Do not attempt to read more than 40 parameters (80 registers) in a single Modbus request to avoid exception errors.
RS485 communication interface, MODBUS RTU protocol:
- Baudrate: 9600 Baud (default, can be set)
- Parity: Even
- Databits: 8
- Stopbits: 1
- Default slave ID: 1 (SMD72D), 45 (SDM72CTM)
- Number of Drivers and Receivers: 32 Drivers, 32 Receivers (without repeater)
- Maximum Cable Length: 1200 m
- Maximum Data Rate: 10 Mbaud
- Maximum Common Mode Voltage: 12 V .. –7 V
- Minimum Driver Output Levels (Loaded): +/– 1.5 V
- Minimum Driver Output Levels (Unloaded): +/– 6 V
- Drive Load: Minimum 60 ohms
- Driver Output Short Circuit Current Limit: 150 mA to Gnd, 250 mA to 12 V, 250 mA to -7 V
- Minimum Receiver Input Resistance: 12 kΩ
- Receiver Sensitivity: +/- 200 mV
Convert word array to real array
The Input registers are in a word format and must be converted into real numbers in pairs. This conversion involves straightforward bit-level merging, which can be implemented in LabView, for example, as shown below:
32-bit (2 words) input registers
The registers are read-only. All values are 4-byte IEEE 754 float type.
| Register Nr | 32 bit address | Description | Unit | Type |
|---|---|---|---|---|
| 30001 | 1 | Phase 1 line to neutral volts | Volts | SDM630, SDM230 |
| 30003 | 2 | Phase 2 line to neutral volts | Volts | |
| 30005 | 3 | Phase 3 line to neutral volts | Volts | |
| 30007 | 4 | Phase 1 current | Amps | SDM630, SDM230 |
| 30009 | 5 | Phase 2 current | Amps | SDM630 |
| 30011 | 6 | Phase 3 current | Amps | SDM630 |
| 30013 | 7 | Active Power Phase 1 | Watts | SDM630, SDM230 |
| 30015 | 8 | Active Power Phase 2 | Watts | SDM630 |
| 30017 | 9 | Active Power Phase 3 | Watts | SDM630 |
| 30019 | 10 | Apparent power Phase 1 | VA | SDM630, SDM230 |
| 30021 | 11 | Apparent power Phase 2 | VA | SDM630 |
| 30023 | 12 | Apparent power Phase 3 | VA | SDM630 |
| 30025 | 13 | Phase 1 volt amps reactive | VAr | SDM630, SDM230 |
| 30027 | 14 | Phase 2 volt amps reactive | VAr | SDM630 |
| 30029 | 15 | Phase 3 volt amps reactive | VAr | SDM630 |
| 30031 | 16 | Reactive power Phase 1 (pos: forward current, neg: reverse current) | - | SDM630, SDM230 |
| 30033 | 17 | Reactive power Phase 2 (pos: forward current, neg: reverse current) | - | SDM630 |
| 30035 | 18 | Reactive power Phase 3 (pos: forward current, neg: reverse current) | - | SDM630 |
| 30037 | 19 | Phase 1 phase angle | Degrees | SDM630, SDM230 |
| 30039 | 20 | Phase 2 phase angle | Degrees | SDM630 |
| 30041 | 21 | Phase 3 phase angle | Degrees | SDM630 |
| 30043 | 22 | Average line to neutral volts | Volts | SDM630 |
| 30047 | 24 | Average line current | Amps | SDM630 |
| 30049 | 25 | Sum of line currents | Amps | SDM630 |
| 30053 | 27 | Total system power | Watts | SDM630 |
| 30057 | 29 | Total system volt amps | VA | SDM630 |
| 30061 | 31 | Total system power factor | VAr | SDM630 |
| 30063 | 32 | Total system power factor (pos: forward current, neg: reverse current) | - | SDM630 |
| 30067 | 34 | Total system phase angle | Degrees | SDM630 |
| 30071 | 36 | Frequency of supply voltages | Hz | SDM630, SDM230 |
| 30073 | 37 | Total Import Energy | kWh | SDM630, SDM230 |
| 30075 | 38 | Total Export Energy | kWh | SDM630, SDM230 |
| 30077 | 39 | Total Import Reactive Energy | kVArh | SDM630, SDM230 |
| 30079 | 40 | Total Export Reactive Energy | kVArh | SDM630, SDM230 |
| 30081 | 41 | Total Power | kVAh | SDM630 |
| 30083 | 42 | Current Hour | Ah | SDM630 |
| 30085 | 43 | Total system power demand (power sum demand calculation is for import – export) | W | SDM630, SDM230 |
| 30087 | 44 | Maximum total system power demand (power sum demand calculation is for import – export) | VA | SDM630, SDM230 |
| 30089 | 45 | Current system positive power demand | W | SDM630, SDM230 |
| 30091 | 46 | Maximum system positive power demand | W | SDM630, SDM230 |
| 30093 | 47 | Current system reverse power demand | W | SDM630, SDM230 |
| 30095 | 48 | Maximum system reverse power demand | W | SDM630, SDM230 |
| 30101 | 51 | Total system VA demand | VA | SDM630 |
| 30103 | 52 | Maximum total system VA demand | VA | SDM630 |
| 30105 | 53 | Neutral current demand | Amps | SDM630 |
| 30107 | 54 | Maximum neutral current demand | Amps | SDM630 |
| 30201 | 101 | Line 1 to Line 2 volts | Volts | SDM630 |
| 30203 | 102 | Line 2 to Line 3 volts | Volts | SDM630 |
| 30205 | 103 | Line 3 to Line 1 volts | Volts | SDM630 |
| 30207 | 104 | Average line to line volts | Volts | SDM630 |
| 30225 | 113 | Neutral current | Amps | SDM630 |
| 30235 | 118 | Phase 1 L/N volts THD | % | SDM630 |
| 30237 | 119 | Phase 2 L/N volts THD | % | SDM630 |
| 30239 | 120 | Phase 3 L/N volts THD | % | SDM630 |
| 30241 | 121 | Phase 1 Current THD | % | SDM630 |
| 30243 | 122 | Phase 2 Current THD | % | SDM630 |
| 30245 | 123 | Phase 3 Current THD | % | SDM630 |
| 30249 | 125 | Average line to neutral volts THD | % | SDM630 |
| 30251 | 126 | Average line current THD | % | SDM630 |
| 30259 | 130 | Phase 1 current demand | Amps | SDM630, SDM230 |
| 30261 | 131 | Phase 2 current demand | Amps | SDM630 |
| 30263 | 132 | Phase 3 current demand | Amps | SDM630 |
| 30265 | 133 | Maximum phase 1 current demand | Amps | SDM630, SDM230 |
| 30267 | 134 | Maximum phase 2 current demand | Amps | SDM630 |
| 30269 | 135 | Maximum phase 3 current demand | Amps | SDM630 |
| 30335 | 168 | Line 1 to line 2 volts THD | % | SDM630 |
| 30337 | 169 | Line 2 to line 3 volts THD | % | SDM630 |
| 30339 | 170 | Line 3 to line 1 volts THD | % | SDM630 |
| 30341 | 171 | Average line to line volts THD | % | SDM630 |
| 30343 | 172 | Total active energy (total kWh / kVarh equals Import + export) | kWh | SDM630, SDM230 |
| 30345 | 173 | Total reactive energy (total kWh / kVarh equals Import + export) | kvarh | SDM630, SDM230 |
| 30347 | 174 | L1 import active energy | kWh | SDM630 |
| 30349 | 175 | L2 import active energy | kWh | SDM630 |
| 30351 | 176 | L3 import active energy | kWh | SDM630 |
| 30353 | 177 | L1 export active energy | kWh | SDM630 |
| 30355 | 178 | L2 export active energy | kWh | SDM630 |
| 30357 | 179 | L3 export active energy | kwh | SDM630 |
| 30359 | 180 | L1 total active energy (total kWh / kVarh equals Import + export) | kwh | SDM630 |
| 30361 | 181 | L2 total active energy (total kWh / kVarh equals Import + export) | kwh | SDM630 |
| 30363 | 182 | L3 total active energy (total kWh / kVarh equals Import + export) | kwh | SDM630 |
| 30365 | 183 | L1 import reactive energy | kvarh | SDM630 |
| 30367 | 184 | L2 import reactive energy | kvarh | SDM630 |
| 30369 | 185 | L3 import reactive energy | kvarh | SDM630 |
| 30371 | 186 | L1 export reactive energy | kvarh | SDM630 |
| 30373 | 187 | L2 export reactive energy | kvarh | SDM630 |
| 30375 | 188 | L3 export reactive energy | kvarh | SDM630 |
| 30377 | 189 | L1 total reactive energy (total kWh / kVarh equals Import + export) | kvarh | SDM630 |
| 30379 | 190 | L2 total reactive energy (total kWh / kVarh equals Import + export) | kvarh | SDM630 |
| 30381 | 191 | L3 total reactive energy (total kWh / kVarh equals Import + export) | kvarh | SDM630 |
| 30385 | 193 | Current resettable total active energy | kWh | SDM630, SDM230 |
| 30387 | 194 | Current resettable total reactive energy | kvarh | SDM630, SDM230 |
Source: https://www.eastroneurope.com/images/uploads/products/protocol/SDM630_MODBUS_Protocol.pdf
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32-bit (2 words) holding registers
The registers are read/write.
| Address register | Parameter number | Parameter | Valid range | type | mode |
|---|---|---|---|---|---|
| 40003 | 2 | Demand period | Write demand period: 0, 5,8, 10, 15, 20, 30, or 60 minutes, default 60. Setting the period to 0 will cause the demand to show the current parameter value, and demand max to show the maximum parameter value since the last demand reset. | Length: 4 byte, Data Format: Float | rw |
| 40011 | 6 | System type | Write system type: 3p4w = 3, 3p3w = 2 & 1p2w= 1 Requires password, see parameter 13 | Length : 4 byte, Data Format : Float | rw |
| 40013 | 7 | Pulse 1 width | Write pulse1 on period in milliseconds: 60, 100, or 200, default 100. | Length: 4 byte, Data Format: Float | r |
| 40015 | 8 | Password lock | Write any value to password lock-protected registers. Read password lock status: 0 = locked. 1 = unlocked. Reading will also reset the password timeout back to one minute. | Length: 4 byte, Data Format: Float | r |
| 40019 | 10 | Network Parity Stop | Write the network port parity/stop bits for MODBUS Protocol, where: 0 = One stop bit and no parity, default. 1 = One stop bit and even parity. 2 = One stop bit and odd parity.3 = Two stop bits and no parity.Requires a restart to become effective. | Length : 4 byte, Data Format : Float | rw |
| 40021 | 11 | Network Node | Write the network port node address: 1 to 247 for MODBUS Protocol, default 1. Requires a restart to become effective. | Length : 4 byte, Data Format : Float | rw |
| 40023 | 12 | Pulse1 Divisor1 | Write pulse divisor index: n = 0 to 5 0: 0.0025 kWh(kVArh)/imp 1: 0.01 kWh(kVArh)/imp 2: 0.1 kWh(kVArh)/imp 3: 1 kWh(kVArh)/imp 4: 10 kWh(kVArh)/imp 5: 100 kWh(kVArh)/imp | Length : 4 byte, Data Format : Float | rw |
| 40025 | 13 | Password | Write password for access to protected registers. Default: 0000 | Length: 4 byte, Data Format: Float | rw |
| 40029 | 15 | Network Baud Rate | Write the network port baud rate for MODBUS Protocol, where: 0: 2400 baud 1: 4800 baud 2: 9600 baud, default 3: 19200 baud 4: 38400 baud Requires a restart to become effective | Length: 4 byte, Data Format: Float | rw |
| 40087 | 44 | Pulse 1 Energy Type | Write MODBUS Protocol input parameter for pulse output 1: 1: import active energy 2: total active energy 4: export active energy, default 5: import reactive energy 6: total reactive energy 8: export reactive energy | Length : 4 byte, Data Format : Float | rw |
| 461457 | 30729 | reset | 00 00 ：reset the Maximum demand | Length : 2 byte, Data Format : Hex | w |