PM1200
The EasyLogic PM1200 is a compact power meter that combines energy, power and demand measurement. It is the economical choice for small panel incomers, DIN-rail submetering and building management systems. Modbus RTU communication makes BMS integration straightforward.
| Voltage | Phase-neutral + line-line, 0.1 V resolution |
| Current | I L1/L2/L3, 0.01 A resolution |
| Power | kW / kVAr / kVA phase + total |
| Power Factor | PF phase + total |
| Frequency | Hz, 0.01 Hz resolution |
| Energy | kWh import · kVArh · kVAh |
| Harmonics | THD (up to the 9th harmonic) |
| Accuracy | Class 1 (IEC 62053-21) |
| Communication | RS485 Modbus RTU |
| Input Voltage | 44–277 V AC · 44–277 V DC |
| Mounting | DIN rail — 4 modules |
| Power Supply | 44–277 V AC/DC |
Integration with Argus EMS
The PM1200 connects to Argus EMS over Modbus RTU over an RS-485 serial line, and because a ready register template ships with the platform you do not have to work out a point map on site. The field agent polls the device every 60 seconds by default, writes the reading into a local queue first and then forwards it to the server over MQTT/TLS; nothing is deleted before the server acknowledges it. Hourly and daily summaries are derived from these raw readings, and the consumption and cost screens are fed from the same series.
| Protocol | Modbus RTU over an RS-485 serial line |
| Connection path | The RS-485 line lands on a Modbus TCP gateway or on the field PC serial port |
| Default polling period | 60 seconds (field agent) |
| Points in the ready template | 18 registers |
| Consumption calculation | Difference of the kWh import index over the period (MAX − MIN) |
| Data assurance | Local queue plus server acknowledgement; nothing is deleted before it is confirmed |
When Is This Model the Right Choice?
It is enough to meter a single panel outgoer or tenant feeder: current, voltage and the kWh index are read, which is the baseline monthly billing and sub-metering need. If harmonic analysis, waveform capture or event logging is expected, a higher series should be chosen.
The device has a serial output, so it joins the existing RS-485 line instead of requiring a dedicated Ethernet run into the panel. The more devices share one line, the longer a polling round takes, which is why the field agent reads each line sequentially and waits 60 ms between devices by default. A slave ID collision and a missing line termination are the two most common commissioning mistakes.