RSM-3402 is a mixed I/O data acquisition module launched by Guangzhou Zhiyuan Electronics Co., Ltd. It has 4 differential and 8 single-ended inputs, 2 analog outputs, 2 digital outputs, and 2 digital inputs, which can meet the needs of different applications.
The RSM-3402 is a mixed I/O data‑acquisition module with four differential analog inputs, two analog outputs, and digital I/O, designed for industrial control and monitoring. It features a 32‑bit ARM processor, isolated RS‑485 communication, and supports Modbus and a custom ASCII protocol.
The manual includes functional descriptions, hardware architecture, electrical parameters, terminal layout, mechanical dimensions, installation steps, and a disclaimer. It also details remote firmware upgrade procedures and configuration of communication parameters. This manual is written in Chinese.
| Analog input bandwidth | 2 kHz |
|---|---|
| Sampling rate (single channel) | 1000 samples/s |
| Isolation voltage (I/O) | 1000 Vdc |
| RS‑485 isolation voltage | 2500 Vdc |
| Power consumption | 2 W |
| Digital input low‑level voltage | 0‑1 V |
| Digital input high‑level voltage | 3.5‑30 V |
It supports the standard Modbus protocol and a custom ASCII protocol.
Firmware can be upgraded remotely via PC software; the default password is 88888 and can be changed in the test software.
The RS‑485 interface provides isolation up to 2500 Vdc.