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Welcome to Vol. 12 of The Probots Showdown. Three boards. Three price points. Three very different futures for your project.Should you stick with the
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The essential industrial panel meter for process monitoring. Reads standard analogue signals (0-10V, 0-20mA, 4-20mA) from sensors and displays them in real-time percentage or custom engineering units. Features RS-485 Modbus RTU output for integration with PLCs and SCADA systems.
Quick Introduction: Bridge the gap between your sensors and your control system with the ProMax VCM01-RS485. This universal process indicator doesn't just display data; it digitises it. Designed to read standard industrial signals like 0-10V and 4-20mA, it provides a bright, clear LED readout for operators while simultaneously transmitting that data to your PLC, HMI, or PC via RS-485 Modbus RTU. Whether you are monitoring tank levels, pipe pressure, or motor speed, this meter is the robust solution you need.
Detailed Specifications
Model: ProMax VCM01-RS485
Input Signals:
Voltage: 0-10V, 2-10V.
Current: 0-20mA, 4-20mA (Requires jumper configuration).
Power Supply: DC 8V - 25V (Standard Industrial 24V compatible).
Display: 4-Digit Red LED (0.0 - 100.0% Default; Scalable via menu).
Communication: RS-485 (Modbus RTU Protocol).
Accuracy: 0.1% (Factory calibrated).
Sampling Rate: 5 readings/second.
Dimensions:
Panel Cutout: 76mm x 39mm.
Bezel Size: 79mm x 43mm.
Protection: Reverse polarity protection on the power input.
Quality Advantage & Differentiation: Why choose the VCM01-RS485?
Dual Connectivity: Unlike standard "dumb" displays, this unit acts as a gateway. It gives local operators a visual reading while sending precise digital data to your central control system over RS485, eliminating the need for separate analog input cards on your PLC.
Universal Compatibility: One meter covers all standard ranges. Whether your sensor outputs voltage or current, this meter can handle it with a simple wiring change and menu setting.
Custom Scaling: It doesn't just show "Volts" or "Amps." You can calibrate the display to show Engineering Units. For example, 4mA = "0.0 PSI" and 20mA = "100.0 PSI".
Key Applications & Usage
Level Monitoring: Display tank level in % or Litres from a hydrostatic level sensor.
Speed Control: Show VFD motor speed (0-10V output) in RPM.
Pressure Readout: Monitor hydraulic or pneumatic pressure locally at the machine.
Data Logging: Convert analogue sensor data to Modbus for logging on a Raspberry Pi or PC.
What's Included & Required
Included: 1x ProMax VCM01-RS485 Digital Display Meter.
Required: 24V DC Power Supply, Analogue Sensor (e.g., Pressure Transmitter), Wires.
The "Virtual Technician" Support Panel
⚠️ CRITICAL WIRING WARNINGS:
Current Mode (4-20mA): You MUST short-circuit the terminals labelled "mA" and "Ai" (or sometimes "Input" and a dedicated current pin,) depending on the specific PCB revision. Check the sticker on the case carefully. Failure to bridge the correct pins for current mode will result in zero readings.
Shared Ground: The signal ground (GND) and power ground (GND) are internally connected. Ensure your sensor and power supply share a common reference if wired independently.
RS-485 Polarity: Connect A to A (D+) and B to B (D-). Reversing these will stop communication but won't damage the unit.
Menu Navigation (Cheat Sheet):
Enter Menu: Long-press press SET button (3+ seconds).
F0: Display Mode (0 = %, 1 = Hz, 2 = Custom Value).
F1: Input Configuration (F1-0: 0=0-10V, 1=0-20mA, 2=4-20mA).
F2: Min/Max Display Scaling (Set what 4mA equals and what 20mA equals).
F7: RS-485 Address & Baud Rate Settings.
Troubleshooting: Display stuck at 0? If using 4-20mA, verify your sensor is actually powered. This meter is a passive device; it does not supply power to the sensor (Loop Power). You need an external power source for 2-wire sensors.
Call to Action (CTA): Give your sensors a voice. Add the ProMax VCM01-RS485 Display to your cart and upgrade your control panel with professional visualisation and connectivity!
| Technical Details |
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Probots sells every Electronics Part for your next Project. You can order 10,000+ Electronic Parts Online - Arduino, Raspberry Pi, NodeMCU Development Boards, Sensors, Motors, Motor Drivers, SMPS, Plastic Enclosures etc in India directly on probots.co.in
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