1. Overview
LORAWAN's main function is to centrally measure and convert multiple channels of standard DC transducer signals into digital signal outputs. It can measure 8 channels of current and 4 channels of voltage input signals. The multi-channel DC smart transmitter can be widely used in various industrial control and measurement systems, primarily measuring 4–20mA or 0–10V signals output by transducers for pressure, temperature, flow, electrical parameters, etc. The output interfaces are RS485 or RS232 communication ports, with a wide-range power supply of DC 9–30V, using the standard MODBUS-RTU communication protocol.
2. Product Models
DL-42123-34N3: 4 channels voltage, 8 channels current input, MODBUS protocol, 9–30V power supply;
DL-42121-34N3: 12 channels voltage input, MODBUS protocol, 9–30V power supply;
DL-42122-34N3: 12 channels current input, MODBUS protocol, 9–30V power supply;


3. Product Features
2 Utilizes 24-bit AD, high measurement accuracy, actual accuracy up to 0.2 class;
2 Wide dynamic range, better than 1000:1;
2 Uses plug-in terminal wiring, convenient for on-site use;
2 Wide-range power supply from 9V to 30V, strong versatility;
2 High reliability, surge voltage resistance on power end up to 4KV or more;
4. Main Technical Indicators 
Input Signals
Input: 8 channels current and 4 channels voltage (Model 42123) or 12 channels voltage (Model 42121);
Input Range: Current and voltage combination type: input 4–20mA, 0–10V;
12 channels voltage type input 50V; 12 channels current type input 0–20mA/4–20mA;
Overload Capacity: Can measure correctly at 1.2 times overload; withstands 2 times overload input for 1S without damage;
Input Impedance: Current channel 110Ω; voltage channel > 100KΩ;
Data Update Cycle: 800mS;
Communication Output
Output Interface: RS-485, two-wire system, ±15KV ESD protection; or RS-232 interface, ±2KV ESD protection;
Communication Protocol: Standard MODBUS-RTU protocol;
Communication Rate: 1200, 2400, 4800, 9600 (default), 19200 bps, software configurable;
Parity: Odd, even, none (default), software configurable;
Module Address: 01H～FFH, factory default 01, software configurable;
Isolation: Isolation between voltage/current inputs and power/communication, isolation voltage 2500V DC;
Measurement Accuracy: 0.5 class;
Power Supply: DC 9～30V;
Operating Temperature: -20℃～60℃;
Storage Temperature: -40℃～85℃; Relative Humidity: 5%～95% non-condensing;
Installation Method: 35mm standard DIN rail mounting;
Dimensions: 122mm * 70mm * 43mm;