20 Channel Through-Hole AC/DC Current Data Acquisition Module RS485 Modbus RTU

Product Overview

The 20-channel through-hole AC/DC current acquisition module is designed for real-time multi-channel current monitoring and industrial data acquisition applications. The module integrates high-precision closed-loop current sensors and true RMS measurement technology, enabling accurate acquisition of AC and DC current signals, including distorted waveforms.

The device supports simultaneous sampling of 20 independent current channels and optional total voltage measurement. With isolated RS485 communication and standard Modbus-RTU protocol, it is widely used in industrial automation, aging test systems, production line monitoring, electrical equipment testing, and power management systems.

The module adopts industrial-grade 24-bit high-precision ADC sampling with excellent linearity, temperature stability, and long-term reliability.

Key Features

1.20-channel simultaneous independent A/D sampling

2.Fast acquisition update rate up to 20ms

3.High-precision closed-loop current sensor

4.Linear error less than 0.2%

5.True RMS measurement for AC/DC signals

6.Supports distorted waveform measurement

7.RS485 communication with Modbus-RTU protocol

8.Optional hardware DIP switch or software configuration

9.Isolated voltage input measurement

10.Full isolation between input, power supply, and communication

11.Isolation withstand voltage >2500V DC

12.Supports absolute value and bipolar measurement modes

13.Industrial DIN rail mounting

14.No exposed electrical solder pads on the front panel for improved EMC performance

Model Selection

ZH-44102A-14F5:10-channel through-hole DC current acquisition module

ZH-44202A-14F5:20-channel through-hole DC current acquisition module

ZH-44103A-14F5:1 voltage input + 10-channel current acquisition module

ZH-44203A-14F5:1 voltage input + 20-channel current acquisition module

Technical Specification

Current Measurement

Voltage Measurement

Communication Interface

1.Address: 1

2.Baud Rate: 9600bps

3.Parity: None

4.Data Bits: 8

5.Stop Bit: 1

Electrical Characteristics

Configurable data refresh interval:20ms/40ms/60ms/80ms/100ms (default)/400ms/1000ms

Installation

1.Standard 35mm DIN rail mounting
2.Compact industrial design
3.Suitable for electrical cabinets and automation systems

Applications

1.Industrial automation systems

2.Aging test equipment

3.Production line monitoring

4.PLC current monitoring

5.Multi-channel power monitoring

6.Electrical laboratory testing

7.Industrial IoT data acquisition

8.Motor current monitoring

9.Energy management systems

10.Factory equipment diagnostics

FAQ – 20 Channel AC/DC Current Acquisition Module

1. What communication protocol does this current acquisition module support?

The module supports standard RS485 communication with Modbus-RTU protocol, making it compatible with PLCs, SCADA systems, industrial PCs, and various industrial automation controllers.

2. Can this module measure both AC and DC current?

Yes. The module supports universal AC/DC current measurement and uses true RMS measurement technology to accurately measure sinusoidal and distorted waveforms.

3. How many current channels can be monitored simultaneously?

This model supports simultaneous acquisition of 20 independent current channels. Each channel is independently sampled for high accuracy and fast response.

4. Does the module support voltage measurement?

Yes. Selected models support 1 channel total voltage measurement in addition to 20 current channels.

5. What current ranges are available?

Available current measurement ranges include:5A-60A DC

Custom ranges may also be available upon request.

6. What is the accuracy of the current measurement?

The module provides 0.5% FS measurement accuracy with linear error less than 0.2%.