RSM-3802 is an analog input module that can simultaneously sample 8 differential signals with a resolution of 12 bits. It is suitable for collecting various voltage and current signals in the industrial field. The module also has 2 digital output channels, which can be set as user control output or over-limit state indication output.
The RSM-3802 is an 8‑channel differential analog input module designed for industrial data collection. It provides isolated analog inputs, two digital output channels, and an RS‑485 communication interface with Modbus and custom ASCII protocols. The module includes optical and power isolation, a watchdog circuit, and supports remote firmware upgrades.
The hardware consists of a 32‑bit ARM MCU, isolated DC‑DC converters, A/D conversion circuitry, and a DIN‑rail mounting design. Installation is performed by locking the module to a DIN‑rail and securing it with the provided mounting brackets. Communication parameters such as device address, baud rate and protocol mode are stored in EPROM and can be configured via the supplied software. This manual is written in Chinese.
| Analog input channels | 8 differential |
|---|---|
| Input voltage range | +10 V or ±5 V |
| Isolation voltage (digital I/O) | 1000 VDC |
| RS‑485 isolation voltage | 2500 VDC |
| Operating temperature range | -20 °C to +85 °C |
The module provides eight differential analog input channels with a 12‑bit resolution.
The module operates from –20 °C up to +85 °C.
Parameters are stored in EPROM and can be set via the configuration software over the RS‑485 interface; shorting the INIT pin to GND during power‑up forces the module to use the default settings.