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# RS485 to Ethernet Module Installation Guide
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## Overview
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This guide provides step-by-step instructions for installing a 2-Channel RS485 to Ethernet adapter module to connect Modbus devices (thermostats) to a network.
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## Hardware Requirements
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- 2-CH RS485 to Ethernet adapter module
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- Existing 24V DC transformer
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- RS485/Modbus devices (e.g., thermostats)
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- Appropriate wiring (shielded twisted pair recommended for RS485)
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## Module Specifications
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- **Power Input**: 6-36V DC (24V DC typical)
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- **RS485 Channels**: 2 independent channels
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- **Ethernet Ports**: 2 ports (either can be used for network, other for cascading)
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## Connection Diagram
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### Power Connections
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```
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24V DC Transformer RS485 Module
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┌─────────────┐ ┌──────────────────┐
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│ │ │ │
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│ + 24V ───┼────────────┼──→ 6-36V Input │
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│ │ │ │
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│ - GND ───┼────────────┼──→ Ground │
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│ │ │ │
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└─────────────┘ └──────────────────┘
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```
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### RS485 Data Connections
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```
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Electrical Panel RS485 Module
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XCOM Terminal Group
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┌──────────────────────┐ ┌─────────────────────┐
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│ │ │ │
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│ Device 1 (String 1) │ │ RS485 Channel 1 │
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│ ├─ T+ (Data+) ──────┼───────────┼──→ A │
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│ ├─ T- (Data-) ──────┼───────────┼──→ B │
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│ └─ GND ─────────────┼───────────┼──→ Signal Ground │
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│ │ │ │
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│ Device 2 (String 2) │ │ RS485 Channel 2 │
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│ ├─ T+ (Data+) ──────┼───────────┼──→ A │
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│ ├─ T- (Data-) ──────┼───────────┼──→ B │
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│ └─ GND ─────────────┼───────────┼──→ Signal Ground │
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│ │ │ │
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└──────────────────────┘ └─────────────────────┘
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```
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### Complete System Overview
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```
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┌─────────────────┐
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│ 24V DC Power │
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│ Transformer │
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└────────┬────────┘
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│
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┌────────▼──────────────────────────┐
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│ RS485 to Ethernet Module │
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│ │
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│ Power: 6-36V Input, Ground │
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│ │
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│ RS485-1: A, B, GND │
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│ RS485-2: A, B, GND │
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│ │
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│ Ethernet: ETH1 or ETH2 ────────► To Network
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│ │
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└──────┬─────────────┬──────────────┘
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│ │
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┌─────────▼─────┐ ┌───▼────────────┐
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│ Thermostat │ │ Thermostat │
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│ String 1 │ │ String 2 │
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│ (via Modbus) │ │ (via Modbus) │
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└───────────────┘ └────────────────┘
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```
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## Installation Steps
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### 1. Safety First
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⚠️ **IMPORTANT**: Disconnect all power before beginning installation.
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### 2. Power Connection
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1. Locate the existing 24V DC transformer
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2. Connect the module's **6-36V Input** terminal to the transformer's **+ (positive)** output
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3. Connect the module's **Ground** terminal to the transformer's **- (negative)** output
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**Wire colors (typical)**:
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- Red: +24V DC
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- Black: Ground/Common
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### 3. RS485 Data Connections
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#### Understanding the XCOM Terminal Group
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In your electrical panel's XCOM group, you'll find:
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- First set of wires: RDZ HMI connections
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- Following pairs: Two RS485 pairs for two strings of thermostats
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#### Connection Notes
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- **T+** on devices connects to **A** on the module
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- **T-** on devices connects to **B** on the module
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- **PE/GND** connects to **Signal Ground** on the module
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- Some wires may be unmarked - verify with continuity testing
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#### Wiring Each Channel
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Connect each RS485 device string to one of the two module channels:
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**For String 1** (any channel - e.g., RS485-1):
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```
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Device T+ ──→ RS485-1 A
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Device T- ──→ RS485-1 B
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Device GND ─→ RS485-1 Signal Ground
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```
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**For String 2** (remaining channel - e.g., RS485-2):
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```
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Device T+ ──→ RS485-2 A
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Device T- ──→ RS485-2 B
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Device GND ─→ RS485-2 Signal Ground
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```
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> **Note**: The assignment of devices to Channel 1 or Channel 2 is flexible. Choose either channel for each device string - the specific mapping doesn't matter as thermostat identification is done after discovery through the network.
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### 4. Verify Connections
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**Before applying power**:
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1. ✅ Check continuity between Wi-SA connectors and module terminals
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2. ✅ Verify correct polarity on power connections
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3. ✅ Ensure RS485 wires are properly paired (A-to-A, B-to-B)
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4. ✅ Confirm all ground connections are secure
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### 5. Ethernet Connection
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1. Connect an Ethernet cable from either **ETH1** or **ETH2** to your network switch/router
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2. The second Ethernet port can be used for router cascading if needed
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### 6. Power On and Test
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1. Restore power to the 24V DC transformer
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2. Check the module's LED indicators:
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| LED | Description |
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|-----|-------------|
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| **PWR** | Power indicator - should be solid |
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| **NET** | Network indicator - blinks when connected to Ethernet |
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| **LINK1** | Lights up when establishing RS485 Channel 1 connection |
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| **ACT1** | Lights up when Channel 1 is transmitting data |
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| **LINK2** | Lights up when establishing RS485 Channel 2 connection |
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| **ACT2** | Lights up when Channel 2 is transmitting data |
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## Important Notes
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- ⚠️ Use **shielded twisted pair cable** for all RS485 connections to minimize interference
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- ⚠️ Maintain proper polarity: A↔A (T+), B↔B (T-), GND↔GND
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- ⚠️ Power input must be within **6-36V DC** range (24V DC is typical)
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- ⚠️ Either Ethernet port functions identically - choose whichever is more convenient
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- ℹ️ Channel assignment is flexible - devices can be connected to either RS485-1 or RS485-2
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- ℹ️ Device discovery and mapping is performed after installation via network configuration
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## Troubleshooting
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| Issue | Possible Solution |
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|-------|------------------|
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| PWR LED not lit | Check 24V DC power connections and voltage |
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| NET LED not blinking | Verify Ethernet cable and network connection |
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| LINK LED not lit | Check RS485 wiring polarity (A, B, GND) |
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| No device communication | Verify continuity of RS485 cables; check for proper termination |
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## Post-Installation
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After successful installation:
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1. Access the module's web interface via its IP address
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2. Configure network settings if necessary
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3. Perform device discovery to identify all connected Modbus devices
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4. Map thermostats/devices to their physical locations
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5. Test communication with each device
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## Safety and Compliance
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- Installation should be performed by a **qualified electrician**
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- Follow all local electrical codes and regulations
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- Ensure proper grounding of all equipment
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- Use appropriate wire gauges for the application
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## Additional Resources
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- Consult the module's technical documentation for advanced configuration
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- Refer to device-specific manuals for RS485 settings (baud rate, parity, etc.)
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---
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**Revision**: 1.0
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**Last Updated**: January 2026
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