S series cyclic display measurement and control meter is a series of products designed for the power measurement and control needs of power systems, industrial and mining enterprises, public facilities, and intelligent buildings. It can measure four-way voltage or current with high accuracy; use high-visibility LED to display instrument measurement parameters and grid system running information. The instrument panel has four programming keys, which can be conveniently used by users to realize display switching, keyboard trigger display extinguishing, and instrument parameter programming setting. It has a strong flexibility.
This manual introduces the S series loop display measurement and control instrument designed for power systems, industrial automation, and smart building applications. It explains the high‑precision measurement of four voltage or current channels, LED display, programmable keys, and optional RS‑485 communication with 4 switch inputs.
The document covers technical parameters, installation dimensions, wiring instructions, programming procedures using four keypad buttons, and detailed communication settings (MODBUS‑RTU over RS‑485). It also provides troubleshooting information, command formats, and CRC calculation methods. This manual is written in Chinese.
| Rated voltage | AC100V, 220V, 380V |
|---|---|
| Voltage overload capacity (continuous) | 1.2× |
| Voltage overload capacity (instantaneous) | 2× per second |
| Power consumption (voltage measurement) | <1VA per phase |
| Input resistance (voltage) | >300k Ω |
| Voltage measurement accuracy | Class 0.5, 0.2 |
| Current rating | AC1A, 5A |
| Current measurement accuracy | Class 0.2 |
| Power consumption (current measurement) | <0.4VA per phase |
| Communication interface | RS‑485, MODBUS‑RTU |
| Operating temperature range | -10 °C to 55 °C |
| Storage temperature range | -20 °C to 75 °C |
| Insulation voltage (input & output) | >2kV |
It supports RS‑485 serial communication using the MODBUS‑RTU protocol.
Press the programming key for more than 5 seconds to switch to programming mode.
The voltage overload rating is 1.2 × continuous and 2 × instantaneous (per second).