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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 SDM… |
|---|---|---|---|---|
| 30001 | 1 | Phase 1 Line to Neutral Volts | V | 72, 230, 630 |
| 30003 | 2 | Phase 2 Line to Neutral Volts | V | 72, 630 |
| 30005 | 3 | Phase 3 Line to Neutral Volts | V | 72, 630 |
| 30007 | 4 | Phase 1 Current | A | 72, 230, 630 |
| 30009 | 5 | Phase 2 Current | A | 72, 630 |
| 30011 | 6 | Phase 3 Current | A | 72, 630 |
| 30013 | 7 | Active Power Phase 1 | W | 72, 230, 630 |
| 30015 | 8 | Active Power Phase 2 | W | 72, 630 |
| 30017 | 9 | Active Power Phase 3 | W | 72, 630 |
| 30019 | 10 | Apparent Power Phase 1 | VA | 72, 230, 630 |
| 30021 | 11 | Apparent Power Phase 2 | VA | 72, 630 |
| 30023 | 12 | Apparent Power Phase 3 | VA | 72, 630 |
| 30025 | 13 | Reactive Power Phase 1 | VAr | 72, 230, 630 |
| 30027 | 14 | Reactive Power Phase 2 | VAr | 72, 630 |
| 30029 | 15 | Reactive Power Phase 3 | VAr | 72, 630 |
| 30031 | 16 | Power Factor Phase 1 (pos: forward Current, neg: reverse Current) | - | 72, 230, 630 |
| 30033 | 17 | Power Factor Phase 2 (pos: forward Current, neg: reverse Current) | - | 72, 630 |
| 30035 | 18 | Power Factor Phase 3 (pos: forward Current, neg: reverse Current) | - | 72, 630 |
| 30037 | 19 | Phase 1 Phase angle | Degrees | 230, 630 |
| 30039 | 20 | Phase 2 Phase angle | Degrees | 630 |
| 30041 | 21 | Phase 3 Phase angle | Degrees | 630 |
| 30043 | 22 | Average Line to Neutral Volts | V | 72, 630 |
| 30047 | 24 | Average Line Current | A | 72, 630 |
| 30049 | 25 | Summary of Line Currents | A | 72, 630 |
| 30053 | 27 | Total System Power | W | 72, 630 |
| 30057 | 29 | Total System Apparent Power | VA | 72, 630 |
| 30061 | 31 | Total System Reactive Power | VAr | 72, 630 |
| 30063 | 32 | Total System Power factor (pos: forward Current, neg: reverse Current) | - | 72, 630 |
| 30067 | 34 | Total System Phase angle | Degrees | 630 |
| 30071 | 36 | Frequency of Supply Voltages | Hz | 72, 230, 630 |
| 30073 | 37 | Total Import Energy | kWh | 72, 230, 630 |
| 30075 | 38 | Total Export Energy | kWh | 72, 230, 630 |
| 30077 | 39 | Total Import Reactive Energy | kVArh | 230, 630 |
| 30079 | 40 | Total Export Reactive Energy | kVArh | 230, 630 |
| 30081 | 41 | Total Power | kVAh | 630 |
| 30083 | 42 | Current Hour | Ah | 630 |
| 30085 | 43 | Total System Power Demand (Power sum Demand calculation is for Import – Export) | W | 230, 630 |
| 30087 | 44 | Maximum total System Power Demand (Power sum Demand calculation is for Import – Export) | VA | 230, 630 |
| 30089 | 45 | Current System positive Power Demand | W | 230, 630 |
| 30091 | 46 | Maximum System positive Power Demand | W | 230, 630 |
| 30093 | 47 | Current System reverse Power Demand | W | 230, 630 |
| 30095 | 48 | Maximum System reverse Power Demand | W | 230, 630 |
| 30101 | 51 | Total System Apparent Power Demand | VA | 630 |
| 30103 | 52 | Maximum Total System Apparent Power Demand | VA | 630 |
| 30105 | 53 | Neutral Current Demand | A | 630 |
| 30107 | 54 | Maximum Neutral Current Demand | A | 630 |
| 30201 | 101 | Line 1 to Line 2 Volts | V | 72, 630 |
| 30203 | 102 | Line 2 to Line 3 Volts | V | 72, 630 |
| 30205 | 103 | Line 3 to Line 1 Volts | V | 72, 630 |
| 30207 | 104 | Average Line to Line Volts | V | 72, 630 |
| 30225 | 113 | Neutral Current | A | 72, 630 |
| 30235 | 118 | Phase 1 L/N Volts THD | % | 630 |
| 30237 | 119 | Phase 2 L/N Volts THD | % | 630 |
| 30239 | 120 | Phase 3 L/N Volts THD | % | 630 |
| 30241 | 121 | Phase 1 Current THD | % | 630 |
| 30243 | 122 | Phase 2 Current THD | % | 630 |
| 30245 | 123 | Phase 3 Current THD | % | 630 |
| 30249 | 125 | Average Line to Neutral Volts THD | % | 630 |
| 30251 | 126 | Average Line Current THD | % | 630 |
| 30259 | 130 | Phase 1 Current Demand | A | 230, 630 |
| 30261 | 131 | Phase 2 Current Demand | A | 630 |
| 30263 | 132 | Phase 3 Current Demand | A | 630 |
| 30265 | 133 | Maximum Phase 1 Current Demand | A | 230, 630 |
| 30267 | 134 | Maximum Phase 2 Current Demand | A | 630 |
| 30269 | 135 | Maximum Phase 3 Current Demand | A | 630 |
| 30335 | 168 | Line 1 to Line 2 Volts THD | % | 630 |
| 30337 | 169 | Line 2 to Line 3 Volts THD | % | 630 |
| 30339 | 170 | Line 3 to Line 1 Volts THD | % | 630 |
| 30341 | 171 | Average Line to Line Volts THD | % | 630 |
| 30343 | 172 | Total Active Energy (total kWh / kVarh equals Import + Export) | kWh | 72, 230, 630 |
| 30345 | 173 | Total Reactive Energy (total kWh / kVarh equals Import + Export) | kvarh | 72, 230, 630 |
| 30347 | 174 | L1 Import Active Energy | kWh | 630 |
| 30349 | 175 | L2 Import Active Energy | kWh | 630 |
| 30351 | 176 | L3 Import Active Energy | kWh | 630 |
| 30353 | 177 | L1 Export Active Energy | kWh | 630 |
| 30355 | 178 | L2 Export Active Energy | kWh | 630 |
| 30357 | 179 | L3 Export Active Energy | kWh | 630 |
| 30359 | 180 | L1 total Active Energy (total kWh / kVarh equals Import + Export) | kWh | 630 |
| 30361 | 181 | L2 total Active Energy (total kWh / kVarh equals Import + Export) | kWh | 630 |
| 30363 | 182 | L3 total Active Energy (total kWh / kVarh equals Import + Export) | kWh | 630 |
| 30365 | 183 | L1 Import Reactive Energy | kvarh | 630 |
| 30367 | 184 | L2 Import Reactive Energy | kvarh | 630 |
| 30369 | 185 | L3 Import Reactive Energy | kvarh | 630 |
| 30371 | 186 | L1 Export Reactive Energy | kvarh | 630 |
| 30373 | 187 | L2 Export Reactive Energy | kvarh | 630 |
| 30375 | 188 | L3 Export Reactive Energy | kvarh | 630 |
| 30377 | 189 | L1 total Reactive Energy (total kWh / kVarh equals Import + Export) | kvarh | 630 |
| 30379 | 190 | L2 total Reactive Energy (total kWh / kVarh equals Import + Export) | kvarh | 630 |
| 30381 | 191 | L3 total Reactive Energy (total kWh / kVarh equals Import + Export) | kvarh | 630 |
| 30385 | 193 | Current Resettable Total Active Energy | kWh | 72, 230, 630 |
| 30387 | 194 | Current Resettable Total Reactive Energy | kvarh | 72, 230, 630 |
| 30389 | 389 | Resettable Import Active Energy | kWh | 72 |
| 30391 | 391 | Resettable Export Active Energy | kWh | 72 |
| 30397 | 397 | Netto Energy (Import - Export) | kWh | 72 |
| 31281 | 1281 | Total Import Active Power | W | 72 |
| 31283 | 1283 | Total Export Active Power | W | 72 |
The additional energy meters with Easton-type Modbus communication: SDM72, SDM230, SDM630
Source: https://www.eastroneurope.com/images/uploads/products/protocol/SDM630_MODBUS_Protocol.pdf
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32-bit (2 words) holding registers
Registers are classified as read-only (r), read/write (rw), or write-only (w). All values are 4-byte IEEE 754 floating-point numbers.
| Register Nr | 32 bit address | Parameter | Valid range | type | Type SDM… |
|---|---|---|---|---|---|
| 40003 | 3 | Demand period | Specify demand periods as 0, 5, 8, 10, 15, 20, 30, or 60 minutes, with 60 as the default. Setting the period to 0 displays the current parameter value for demand, while demand max shows the highest parameter value since the last reset. | Length: 4 byte Data Format: Float Mode:rw | 630 |
| 40011 | 11 | System type | Write system type: 3p4w = 3, 3p3w = 2, and 1p2w= 1. Requires password, see parameter “password”. | Length: 4 byte Data Format: Float Mode:rw | 72, 630 |
| 40013 | 13 | Pulse 1 width | Specify pulse1 duration in milliseconds: 60, 100, or 200, with 100 as the default. | Length: 4 byte Data Format: Float Mode:rw | 230, 630 |
| 40015 | 15 | Password lock | Enter any value to access password lock-protected registers. To check the lock status: 0 indicates locked, 1 indicates unlocked. Reading this status will also reset the password timeout to one minute. | Length: 4 byte Data Format: Float Mode:rw | 630 |
| 40019 | 19 | Network Parity Stop | Specify the network port parity and stop bits for the MODBUS Protocol as follows: 0 = One stop bit, no parity (default). 1 = One stop bit, even parity. 2 = One stop bit, odd parity. 3 = Two stop bits, no parity. A restart is required for changes to take effect. | Length: 4 byte Data Format: Float Mode:rw | 72, 230, 630 |
| 40021 | 21 | 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 Mode:rw | 72, 230 |
| 40023 | 23 | 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 Mode:rw | 630 |
| 40025 | 25 | Password | Enter the password to access protected registers. Default: 0000. | Length: 4 byte Data Format: Float Mode:rw | 630 |
| 40029 | 29 | 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 Mode:rw | 72, 230, 630 |
| 40063 | 63 | Current Transformer ratio | Configurable scale from 1 to 2000, example: 200A:5A → 200 divided by 5 → Set value: 40 | Length: 4 byte Data Format: Float Mode:rw | 630 |
| 40087 | 87 | 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 Mode:rw | 630 |
| 461457 | - | reset | 00 00 ：reset the Maximum demand | Length: 2 byte Data Format: Hex Mode:w | 630 |
| 462721 | - | Demand Interval | Slide Time, Automatic Scroll Display Interval (Scroll Time), Backlight Time Scroll Time=0: the display does not scroll automatically Backlight Time=0: Backlight is Always On. | Length: 4 byte Data Format: BCD “min-min-s-min” Mode:rw | 230 |
| 463761 | - | System Power | Default Format: Hex 0000: 0.001kWh (kVArh) /imp (default) 0001: 0.01kWh (kVArh) /imp 0002: 0.1kWh (kVArh) /imp 0003: 1kWh (kVArh) /imp | Length: 4 byte Data Format: Float Mode:rw | 230 |
| 463776 | - | Measurement Mode | Data Format: Hex 0001: Mode 1 (Total = Import) 0002: Mode 2 (Total = Import + Export) 0003: Mode 3 (Total = Import - Export) | Length: 4 byte Data Format: Float Mode:rw | 230 |
| 463792 | - | Pulse Output & LED Indicator Mode | Data Format: Hex 0000: Import & Export Energy, LED flashes for Import & Export Energy 0001: Import Energy, LED flashes for Import Energy only 0002: Export Energy, LED flashes for Export Energy only | Length: 4 byte Data Format: Float Mode:rw | 230 |
| 464513 | - | Serial number | Serial number | Length: 4 byte Data Format: unsigned int32 Mode:r | 630 |