One Stop Sensor Data Acquisition Edge Controller

This edge controller acquires sensor data and controls devices. It includes:

• 4 × RS-485 ports for Modbus/RTU sensors/devices
• 3 × 12 V relay outputs for switching pumps, valves, fans, etc.
• Local data logging and edge processing; optional cloud forwarding

Safety

• Power off before wiring.
• Use proper isolation for RS-485 lines and relay loads.
• Ensure relay loads do not exceed rated current/voltage.
• Follow local electrical codes.

Connections

1. Power
   • Connect 12 V DC supply to the controller’s power input (observe polarity).
   • Verify supply can handle controller + relay total current.
2. RS-485 (4 ports)
   • Each port has A(+)/B(−) differential pair and ground.
   • Use twisted-pair cable, terminate 120 Ω at both ends when needed.
   • Set unique Modbus addresses/IDs for each connected device.
   • Configure baud rate/parity/stop bits to match devices.
3. Relays (3 × 12 V)
   • Relay coil driven by controller at 12 V; outputs are typically SPDT or NO/NC—check device spec.
   • Wire switched load to relay common and NO/NC depending on required behavior.
   • Protect inductive loads with flyback diodes or external suppression if necessary.
4. Sensors / I/O
   • Connect sensor power and signal lines per their specs.
   • Use shielded cable for analog/low-voltage signals and tie shield to ground at one end.

Configuration

1. Network / Serial Settings
   • Access controller UI (web/serial/desktop app) or use provided configuration tool.
   • Configure each RS-485 port: protocol (Modbus RTU), baud rate, parity, IDs, timeout.
2. Map Inputs to Functions
   • Create data acquisition channels mapping Modbus registers to named variables.
   • Set sampling interval and smoothing/averaging if available.
3. Relay Logic
   • Define control rules: threshold-based (e.g., soil moisture < X → relay ON), schedule, or remote commands.
   • Configure hysteresis and minimum on/off times to prevent chattering.
4. Logging & Forwarding
   • Enable local logging and set retention.
   • Configure cloud/MQTT/HTTP endpoints and credentials for remote telemetry.

Maintenance & Troubleshooting

Keep firmware updated per vendor instructions.

Verify LED indicators: power, COM activity, relay state.

If RS-485 comms fail: check wiring polarity, termination, ground reference, and device IDs.

If relay not switching: verify 12 V power, controller relay enable, and load wiring.