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LamaPLC: Eastron SDM 630 Communication
Eastron measuring units are typically 1- or 3-phase measuring units that can be purchased at extremely favorable prices (e.g. on Amazon, Aliexpress). They are usually not MID compliant. Typically, they can be used for building automation and smaller equipment.
A surprisingly large number of measurements are performed, the status of which can either be viewed on the display or queried via remote access using the Modbus RTU protocol. Not all Modbus parameters are available with all Eastron devices.
RS485 communication interface, MODBUS RTU protocol:
- Baudrate: 9600 Baud (default, can 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
32 bit (2 words) input registers
The registers are read-only.
| Register Nr | 32 bit address | Description | Unit |
|---|---|---|---|
| 30001 | 1 | Phase 1 line to neutral volts | Volts |
| 30003 | 2 | Phase 2 line to neutral volts | Volts |
| 30005 | 3 | Phase 3 line to neutral volts | Volts |
| 30007 | 4 | Phase 1 current | Amps |
| 30009 | 5 | Phase 2 current | Amps |
| 30011 | 6 | Phase 3 current | Amps |
| 30013 | 7 | Phase 1 power | Watts |
| 30015 | 8 | Phase 2 power | Watts |
| 30017 | 9 | Phase 3 power | Watts |
| 30019 | 10 | Phase 1 volt amps | VA |
| 30021 | 11 | Phase 2 volt amps | VA |
| 30023 | 12 | Phase 3 volt amps | VA |
| 30025 | 13 | Phase 1 volt amps reactive | VAr |
| 30027 | 14 | Phase 2 volt amps reactive | VAr |
| 30029 | 15 | Phase 3 volt amps reactive | VAr |
| 30031 | 16 | Phase 1 power factor (1) | VAr |
| 30033 | 17 | Phase 2 power factor (1) | VAr |
| 30035 | 18 | Phase 3 power factor (1) | VAr |
| 30037 | 19 | Phase 1 phase angle | Degrees |
| 30039 | 20 | Phase 2 phase angle | Degrees |
| 30041 | 21 | Phase 3 phase angle | Degrees |
| 30043 | 22 | Average line to neutral volts | Volts |
| 30047 | 24 | Average line current | Amps |
| 30049 | 25 | Sum of line currents | Amps |
| 30053 | 27 | Total system power | Watts |
| 30057 | 29 | Total system volt amps | VA |
| 30061 | 31 | Total system VAr | VAr |
| 30063 | 32 | Total system power factor (1) | - |
| 30067 | 34 | Total system phase angle | Degrees |
| 30071 | 36 | Frequency of supply voltages | Hz |
| 30073 | 37 | Total Import kWh | kWh |
| 30075 | 38 | Total Export kWh | kWh |
| 30077 | 39 | Total Import kVArh | kVArh |
| 30079 | 40 | Total Export kVArh | kVArh |
| 30081 | 41 | Total VAh | kVAh |
| 30083 | 42 | Ah | Ah |
| 30085 | 43 | Total system power demand (2) | W |
| 30087 | 44 | Maximum total system power demand (2) | VA |
| 30101 | 51 | Total system VA demand | VA |
| 30103 | 52 | Maximum total system VA demand | VA |
| 30105 | 53 | Neutral current demand | Amps |
| 30107 | 54 | Maximum neutral current demand | Amps |
| 30201 | 101 | Line 1 to Line 2 volts | Volts |
| 30203 | 102 | Line 2 to Line 3 volts | Volts |
| 30205 | 103 | Line 3 to Line 1 volts | Volts |
| 30207 | 104 | Average line to line volts | Volts |
| 30225 | 113 | Neutral current | Amps |
| 30235 | 118 | Phase 1 L/N volts THD | % |
| 30237 | 119 | Phase 2 L/N volts THD | % |
| 30239 | 120 | Phase 3 L/N volts THD | % |
| 30241 | 121 | Phase 1 Current THD | % |
| 30243 | 122 | Phase 2 Current THD | % |
| 30245 | 123 | Phase 3 Current THD | % |
| 30249 | 125 | Average line to neutral volts THD | % |
| 30251 | 126 | Average line current THD | % |
| 30255 | 128 | Total system power factor (5) | Degrees |
| 30259 | 130 | Phase 1 current demand | Amps |
| 30261 | 131 | Phase 2 current demand | Amps |
| 30263 | 132 | Phase 3 current demand | Amps |
| 30265 | 133 | Maximum phase 1 current demand | Amps |
| 30267 | 134 | Maximum phase 2 current demand | Amps |
| 30269 | 135 | Maximum phase 3 current demand | Amps |
| 30335 | 168 | Line 1 to line 2 volts THD | % |
| 30337 | 169 | Line 2 to line 3 volts THD | % |
| 30339 | 170 | Line 3 to line 1 volts THD | % |
| 30341 | 171 | Average line to line volts THD | % |
| 30343 | 172 | Total kwh | kwh |
| 30345 | 173 | Total kvarh | kvarh |
| 30347 | 174 | L1 import kwh | kwh |
| 30349 | 175 | L2 import kwh | kwh |
| 30351 | 176 | L3 import kwh | kwh |
| 30353 | 177 | L1 export kwh | kwh |
| 30355 | 178 | L2 export kwh | kwh |
| 30357 | 179 | L3 export kwh | kwh |
| 30359 | 180 | L1 total kwh | kwh |
| 30361 | 181 | L2 total kwh | kwh |
| 30363 | 182 | L3 total kwh | kwh |
| 30365 | 183 | L1 import kvarh | kvarh |
| 30367 | 184 | L2 import kvarh | kvarh |
| 30369 | 185 | L3 import kvarh | kvarh |
| 30371 | 186 | L1 export kvarh | kvarh |
| 30373 | 187 | L2 export kvarh | kvarh |
| 30375 | 188 | L3 export kvarh | kvarh |
| 30377 | 189 | L1 total kvarh | kvarh |
| 30379 | 190 | L2 total kvarh | kvarh |
| 30381 | 191 | L3 total kvarh | kvarh |
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 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 |
readable blocks in Modbus
| Nr. of block | Start address | number of registers |
|---|---|---|
| 1 | 3000 | 100 |
| 2 | 3100 | 8 |
| 3 | 3200 | 70 |
| 4 | 3300 | 82 |
| 5 | 4000 | 100 |
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