This product is a data acquisition module for real-time measurement of 24 channels of AC current. 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 various current waveforms with high precision and excellent stability. It features a standard RS-485 bus interface and MODBUS-RTU protocol, and is widely used in street light monitoring, production automation testing, LED lamp aging testing, etc.

This product has the following features:

? 24 channels of 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 Indicators
? 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 channels of 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: The current input is through transformer perforation input, with a transformer aperture of 5mm. It must be ensured that the wire end and diameter are less than 5mm, otherwise the current wire cannot be threaded through.

Table 1. Pin Definition

Note: The initialization terminal is for address and baud rate initialization. After short-circuiting and powering on the product, the address and baud rate will be initialized to 1 and 9600.