Ebyte MA01 Series Modbus RTU PT100/PT1000 K-Type Temperature Module RS485

The Ebyte MA01 series is an industrial-grade Modbus RTU temperature acquisition module supporting 2, 4, 8, or 16 channels of 2/3-wire PT100/PT1000 RTD sensors (-200°C to +850°C) or K-type thermocouples (-270°C to +1372°C) with 0.1°C resolution, delivering isolated RS485 communication, wide DC 8~28V power supply, standard 35mm DIN-rail / screw mounting, and conformal coating protection for multi-point industrial temperature monitoring in PLC, SCADA, and IoT control systems. Key Features & Advantages High-Precision Multi-Channel Temperature Acquisition (2/4/8/16 Channels): Available in scalable 2-channel, 4-channel, 8-channel, and 16-channel configurations with high 0.1°C resolution and +/-0.1% accuracy for centralized industrial thermal monitoring. Universal Sensor Compatibility (2/3-Wire PT100/PT1000 RTD & K-Type Thermocouple): XDXX models natively support both 2-wire and 3-wire PT100 / PT1000 platinum RTDs (-200°C to +850°C), while XEXX models interface directly with K-type thermocouples (-270°C to +1372°C) with cold-junction compensation. Standard RS485 Modbus RTU Protocol & Active Reporting: Seamlessly integrates into Siemens/Mitsubishi/Omron PLCs, SCADA systems, and touchscreens over RS485 (1200~115200 bps), supporting standard Modbus polling as well as proactive periodic temperature uplink mode. Rugged Industrial Design with Conformal Coating & Dual Mounting: Sprayed with military-grade conformal coating (anti-mold, anti-moisture, anti-salt spray), operating across -40°C to +85°C industrial temperatures with DC 8~28V reverse-polarity protected power input and dual 35mm DIN-rail / screw mounting. Core Specifications Parameter Specification / Value Supported Sensor Types XDXX Models: 2/3-Wire PT100, PT1000 RTD | XEXX Models: K-Type Thermocouple Channel Options 2 Channels / 4 Channels / 8 Channels / 16 Channels (Analog Input) Temperature Measurement Range PT100/PT1000: -200 deg C to +850 deg C | K-Type Thermocouple: -270 deg C to +1372 deg C Resolution & Acquisition Frequency 0.1 deg C Resolution | 0.3 Hz Sampling Rate Communication Interface RS485 (5.08mm Industrial Pluggable Terminals) Protocol & Baud Rate Standard Modbus RTU Protocol, Baud Rate: 1200 ~ 115200 bps (Default 9600 bps) Operating Voltage & Power DC 8 ~ 28V (Reverse Polarity Protection), Operating Power: 1.0 ~ 2.0 W Environmental Protection Three-Proof Conformal Coating (Anti-Mold, Anti-Moisture, Anti-Salt Spray) Operating Temperature & Humidity -40 to +85 deg C, 5% ~ 95% RH (Non-condensing) Mounting Method Standard 35mm DIN-Rail Mount and Screw Hole Mount Product Selection Guide Notice for Selection: Choose XDXX series for high-accuracy PT100/PT1000 platinum RTD sensors (-200 to +850 deg C), or choose XEXX series for wide-range K-type thermocouple sensors (-270 to +1372 deg C) according to your field sensor type and required channel count (2/4/8/16 AI). Model SKU Sensor Type Channels Measuring Range Dimensions (L*W*H) Weight Power Supply MA01-XDXX0200 PT100 / PT1000 (2/3-Wire) 2 Channels -200 to +850 deg C 100 * 54 * 32 mm 74 +/- 5 g DC 8 ~ 28V MA01-XDXX0400 PT100 / PT1000 (2/3-Wire) 4 Channels -200 to +850 deg C 113 * 90 * 40 mm 113 +/- 5 g DC 8 ~ 28V MA01-XDXX0800 PT100 / PT1000 (2/3-Wire) 8 Channels -200 to +850 deg C 118 * 115 * 40 mm 150 +/- 5 g DC 8 ~ 28V MA01-XDXX0G00 PT100 / PT1000 (2/3-Wire) 16 Channels -200 to +850 deg C 118 * 175 * 40 mm 245 +/- 5 g DC 8 ~ 28V MA01-XEXX0200 K-Type Thermocouple 2 Channels -270 to +1372 deg C 100 * 54 * 32 mm 71 +/- 5 g DC 8 ~ 28V MA01-XEXX0400 K-Type Thermocouple 4 Channels -270 to +1372 deg C 113 * 90 * 40 mm 106 +/- 5 g DC 8 ~ 28V MA01-XEXX0800 K-Type Thermocouple 8 Channels -270 to +1372 deg C 118 * 115 * 40 mm 138 +/- 5 g DC 8 ~ 28V MA01-XEXX0G00 K-Type Thermocouple 16 Channels -270 to +1372 deg C 118 * 145 * 40 mm 190 +/- 5 g DC 8 ~ 28V Industrial Installation & Wiring The MA01 series features a rugged ABS flame-retardant industrial enclosure supporting both standard 35mm DIN-rail mounting and screw panel mounting. Heavy-duty 5.08mm pluggable screw terminals provide secure field connections. For PT100/PT1000 RTD inputs (XDXX models), 3-wire sensors connect to T+, T+, and T- terminals to eliminate lead resistance error (short the two T+ terminals for 2-wire sensors). For K-type thermocouple inputs (XEXX models), connect positive and negative leads to T+ and T- terminals. RS485 communication utilizes 485-A and 485-B terminals with wide DC 8~28V power supply terminals (V+/V-). Practical Application Scenarios 1. Industrial Heat Treatment & Multi-Zone Furnace Thermal Monitoring In metal forging, vacuum quenching, and industrial annealing furnaces, multi-zone temperature profiles must be monitored across extreme ranges up to 1300°C. Deploying the 16-channel MA01-XEXX0G00 thermocouple module allows comprehensive temperature mapping across all furnace heating chambers, transmitting digitized Modbus RTU telemetry back to the central PLC to maintain stringent metallurgical heating curves. 2. Cold Chain Logistics, Cryogenic Freezers & Pharmaceutical Storage Biopharmaceutical vaccine storage, walk-in ultra-low temperature freezers (-80°C), and refrigerated food warehouses require high-precision continuous logging without drift. Utilizing the MA01-XDXX series with 3-wire PT100/PT1000 RTD sensors delivers 0.1°C resolution across cryogenic ranges, streaming real-time Modbus temperature records to the SCADA monitoring system for FDA 21 CFR Part 11 regulatory compliance. 3. Chemical Reactor Vessels & Pipeline Fluid Temperature Telemetry Chemical processing plants and petrochemical pipelines involve corrosive ambient atmospheres and wide thermal swings. Sprayed with military-grade conformal coating (anti-mold, anti-moisture, anti-salt spray), the MA01 module captures fluid and jacket temperature data directly from RTD thermowells, withstanding harsh plant environments while operating reliably on standard 24V DC cabinet power. 4. Data Center Server Racks & Battery Energy Storage (BESS) Safety High-density server server racks and utility-scale lithium-ion battery containers generate localized hot spots that can lead to thermal runaway. The multi-channel MA01 module enables cost-effective multi-point temperature sensing across individual battery packs and server exhaust aisles, triggering early warning alarms via RS485 serial communication before critical temperature thresholds are breached. FAQ Section 1. What is the wiring difference between 2-wire and 3-wire PT100/PT1000 sensors on XDXX models? For 3-wire RTD sensors, connect the two same-colored compensation leads to the dual T+ terminals and the third lead to the T- terminal; the module automatically cancels out cable resistance. For 2-wire RTD sensors, connect one wire to T- and the other wire to either T+ terminal, then install a short jumper wire between the two T+ terminals. 2. How do I configure the Modbus slave address, baud rate, and active reporting mode? The module can be configured via standard Modbus RTU holding register write commands or by using Ebyte's free graphical IO configuration software. You can set the slave address (1-247), baud rate (1200-115200 bps), and enable active periodic temperature reporting without external master polling. 3. How does the module handle cold-junction compensation for K-type thermocouples on XEXX models? XEXX models feature built-in high-precision onboard cold-junction temperature sensors and internal algorithmic compensation. The module automatically measures the terminal block reference temperature and applies real-time thermoelectric voltage correction, providing accurate thermocouple readings across -40°C to +85°C ambient conditions. 4. How do I restore the module to factory default communication settings? Each MA01 module is equipped with a dedicated RESET hardware button. With the module powered on, press and hold the RESET button for 5 to 10 seconds until the PWR/DATA LED indicator flashes rapidly, resetting the device address to 1 and baud rate to default 9600 bps (8, N, 1).