Overview

The D-30 Communication Distributor is designed to act as an intermediary between multiple masters and multiple slaves in a MODBUS RTU network. Unlike conventional MODBUS setups where one master communicates with multiple slaves, the D-30 supports up to three masters and ensures the correct transmission of data between masters and slaves.

1. Safety Information (p.3-4)

• Electrical Hazards:
  • Ensure power isolation before installation or maintenance.
  • The device operates at high voltage, requiring proper handling.
• Electrostatic Discharge (ESD) Precautions:
  • Handle PCBs with care to prevent static damage.
  • Store in conductive packaging and avoid touching component leads.
  • DO NOT install or remove PCBs while power is applied.

2. Storage Before Installation (p.5)

• Store the equipment in a dry, sheltered area to prevent environmental damage.
• Before installation, check for:
  • Bent or damaged components.
  • Scratches, dents, or other physical deformities.
  • Properly seated connectors and leads.

3. Features (p.6)

• Supports up to three masters communicating with multiple slaves.
• MODBUS RTU Protocol support with Read Holding Registers (0x03).
• Flexible communication interfaces:
  • RS-232, RS-422, and RS-485 selectable via jumpers.
• Supports baud rates of 4800, 9600, and 19200 bps.

4. Technical Specifications (p.6)

5. Connection & Wiring (p.7)

• RS-485 Communication:
  • Requires A/B wiring with a 120Ω termination resistor if needed.
• RS-422 Communication:
  • Supports full-duplex communication with separate transmit (Tx) and receive (Rx) lines.
• RS-232 Communication:
  • Uses Tx, Rx, and GND terminals (no termination resistor required).

6. Configuration & Settings (p.8)

• Jumper Settings for Communication Mode:
  • Select RS-232, RS-422, or RS-485 using internal jumpers.
• Baud Rate Selection:
  • Adjustable via DIP switch and jumpers.
• Termination Resistor Setting:
  • 120Ω termination resistors should be enabled if the system lacks built-in resistors.

7. Revision History (p.9)

• Version R2 (2025.03.03) – Form revision update.