NRP501 Tank-Side Local Display Unit safely and conveniently provides on-site display functionality for instruments compliant with the Modbus RTU/RS485 protocol. The NRP501 Tank-Side Local Display Unit operates on 24V DC power, features an explosion-proof enclosure, and uses an RS485 bus for data acquisition. Key characteristics include:

? Large capacity: One NRP501 Tank-Side Local Display Unit can cyclically display 16 variables from different instruments.
? Easy on-site installation:
1. Multiple NRP501 Tank-Side Local Display Units can be installed on a single bus.
2. Installing or removing the NRP501 Tank-Side Local Display Unit does not affect normal communication between the control room and field instruments.
3. Parameters such as Modbus address, register number, baud rate, and data length can be set via buttons.
? Scaling and offset functionality
? Wide applicability: Offers three operating modes: master, slave, and monitor.
? Good expandability: Additional output functions, such as wireless, can be provided via modules.
? Suitable for sites with explosion-proof requirements

Applications
1. Connected in parallel to the RS485 bus to provide on-site display for devices supporting the Modbus RTU protocol.
2. Remote data transmission (requires adding a wireless module).
3. Debugging and testing Modbus RTU/RS485 devices (requires adding a built-in lithium battery).
Technical Specifications
Operating current: <30mA
Supported protocol: Modbus RTU/RS485
Baud rate: 2400, 4800, 9600 (default), 19200, 38400
Parity bit: N (default), E, O
Display update interval: 1 second/time
Maximum query wait time: 500ms
RS485 load: 1/8 Unit
Ambient temperature: -30℃ to 70℃
Humidity: < 90%
Display: 4-line LCD display
Enclosure protection rating: IP65

Wiring and Installation Dimensions Diagram


Terminal Meaning
24+ 24V DC power positive
24- 24V DC power negative
A/D+ 485 Bus A
B/D- 485 Bus B