This product is a data acquisition module for real-time measurement of 24-channel AC currents. It utilizes high-precision current transformers for signal isolation and sensing, and employs a dedicated true RMS measurement chip to accurately measure the true RMS value of currents with various waveforms, offering high precision and excellent stability. It features a standard RS-485 bus interface and MODBUS-RTU protocol. It is widely used in street light monitoring, production automation testing, LED lamp aging testing, and more.

This product has the following features:

? 24-channel synchronous sampling with independent AD, completing data acquisition and update for all channels in 0.1 seconds;
? High precision, using 24-bit AD sampling;
? Excellent stability, measurement accuracy unaffected by environmental temperature;
? Current perforation input, easy to use;
II. Product Models
DL-40242A (Perforation input method) ZH-40242B (Terminal input method)(<10A)
III. Performance Specifications
? Accuracy class: 0.5%FS;
? Current range: 0-5A/0-10A/0-15A/0-20A AC;
? Current input aperture: Φ5mm;
? Operating temperature: -20℃～+60℃;
? Data update time: 100mS;
? Isolation withstand voltage: >2500V DC;
? Auxiliary power: 24V DC (15V~30V);
? Rated power consumption: 2W;
? Output interface: RS-485;
? Data output: 24-channel AC current values;
? Communication baud rate: 4800, 9600, 19200, 28800 bps;
? Data format: No parity, 8 data bits, 1 stop bit;
? Communication protocol: MODBUS-RTU protocol;

Note: Current input is through transformer perforation input, with a transformer aperture of 5mm. It must be ensured that the wire head and diameter of the current wire are less than 5mm; otherwise, the current wire cannot be threaded through.

Table 1. Pin Definitions

Note: The initialization terminal is for address and baud rate initialization. After shorting, power on the product, and the address and baud rate will be initialized to 1 and 9600, respectively.