waveshareIndustrial 8-Ch Analog Acquisition Module, 12-Bit High-Precision, Supports Voltage and Current Acquisition, DC 7~36V Wide Voltage Power Supply, 8-ch Voltage Mode, 0~10V

We're using this industrial 8-channel analog acquisition module to bring in 12-Bit high-precision analog levels via or RS-485 bus. We're very happy with the results and continue to fine tune how we use it to monitor various functions.

First off, it works, and the Waveshare implementation of the Modbus RTU (RS-485) comm interface is consistently solid across all their products.At $33 when I bought mine, it's quite inexpensive - certainly massively so when compared to 16 bit implementations from places like Advantech.But the scaling on mine is consistently off on all 8 channels: with 20.000mA applied (precision calibration source) all channels read ~19.75mA, which is admittedly within the claimed accuracy of <3%, but the step size should be ~4.8uA so ~250uA is kind of gross - the factory calibration is not terrible, but certainly is not great.A significant, and highly recommended product improvement would be to allow in-field calibration factors as part of the Modbus map - somewhere in the 40xxx register range...

This Waveshare 8-channel analog acquisition module delivers precise 12-bit inputs that handle voltage and current measurements from 0–10 V. I’ve been using it in my test bench, and it reliably captures signals with minimal drift. The wide 7–36 V input range makes it flexible for different setups. It integrates easily with microcontrollers and data loggers, making configuration straightforward. Overall, it’s a dependable and professional-grade solution for multi-channel analog sensing.