Rdu-a G2 User Manual May 2026

| Symptom | Possible Cause | Solution | | :--- | :--- | :--- | | No Display / Blank Screen | No power supply. | Check wiring and fuses. Verify voltage at terminals. | | "Comm Error" Message | Connection to main controller lost. | Check RS485 wiring (A/B). Verify Baud rate matches controller. | | Keypad Unresponsive | Front panel lock active. | Hold "ESC" for 5 seconds to unlock. Check connector ribbon cable. | | Readings are Zero | Sensor failure or configuration. | Check physical sensors on the engine/generator. | | Screen is Dim | Contrast/Brightness setting. | Adjust in the Settings menu. Check ambient temperature. |

| Parameter | Specification | | :--- | :--- | | Operating Voltage | 8 – 36 VDC | | Operating Current | < 200 mA (typical) | | Display Type | Graphic LCD with LED Backlight | | Resolution | 128 x 64 pixels | | Operating Temp | -20°C to +70°C (-4°F to +158°F) | | Storage Temp | -30°C to +80°C (-22°F to +176°F) | | Protection Rating | Front IP65 / Rear IP20 | | Communication | RS485 (Modbus RTU Protocol) | | Weight | Approx. 0.5 kg (1.1 lbs) | | Dimensions | 96mm x 96mm (Standard DIN Mount) | rdu-a g2 user manual

When an alarm occurs: