MTL5051 is a serial data communication isolator. It is mainly used to realize bidirectional serial data communication between safe areas and hazardous areas. It can provide power supply and serial data communication for intrinsically safe explosion-proof text displays such as MTL643 and MTL644, and is also suitable for data communication across hazardous areas. The specific details are as follows:
- Number of Channels: 1 channel
- Power Supply Voltage: 20 to 35V DC
- Input Signal: Supports RS232 or RS422 signals.
- Output Signal: The output varies by mode:
- In MTL640 series mode: 12V power supply with 3V signal superimposed (to hazardous area); 5mA signal superimposed on quiescent current (from hazardous area).
- In cross-hazardous area communication mode: 10mA current source (both to and from hazardous area).
- In RS232/TTL device mode: RS232-compatible signal level (to hazardous area); TTL/RS232 signal (from hazardous area).
- 1200 to 9600 baud (in MTL643/644 mode); up to 19.2 kbaud (in other modes).
- Suitable for Zone 0, Gas Group IIC, and Temperature Class T4-T6 hazardous locations.
- Complies with relevant safety standards.
- Maximum power consumption: 1.7W (at 24V power supply and 25mA load).
- Current consumption varies by power supply voltage: 105mA (at 20V), 90mA (at 24V), 70mA (at 35V).
Equipped with a green power indicator light to display the device’s power status.
Different terminal combinations have different parameters:
- For terminals 1, 2, 3, 4 combination: 14V, 800mW, 192mA.
- For terminals 1, 5, 6 combination: 15V, 70mW, 35mA, etc.
The power supply for intrinsically safe devices can be selected as 5V or 12V via the switch on the top of the device:
- 12V mode: Voltage is 12.0V±5% (when load < 23mA); minimum voltage is 8.0V (when load is 23mA to 50mA).
- 5V mode: Voltage is 5.6V±5% (when load is 23mA to 50mA).
- Zone 0 / Gas Group IIC / Temperature Class T4-T6: Standard classifications for hazardous areas per IEC/GB explosion-proof standards. "Zone 0" means hazardous areas where explosive gas mixtures are continuously present; "IIC" covers highly explosive gases (e.g., hydrogen); "T4-T6" refers to maximum surface temperatures (≤135℃ for T4, ≤85℃ for T6).
- Quiescent Current: The minimum current that flows through the circuit when no signal is transmitted, ensuring the communication loop remains active; a key parameter for stable serial communication in industrial scenarios.
- Baud Rate: The speed of serial data transmission (units: baud); "1200-9600 baud" covers low-speed industrial control signals, while "19.2 kbaud" adapts to higher-speed data exchange (e.g., configuration data transmission).
