# RS485 to RJ45 Ethernet Serial Server (C)

**Type:** Product page · **SKU:** WS-30303 · **Brand:** [Waveshare](https://core-electronics.com.au/brands/waveshare-in-australia)
**Page:** https://core-electronics.com.au/waveshare-single-channel-rs45-to-rj45-serial-server.html ([markdown](https://core-electronics.com.au/waveshare-single-channel-rs45-to-rj45-serial-server.html.md))

Industrial serial server, RS485 to RJ45 Ethernet, TCP/IP to serial, rail-mount support, with POE function(optional) | RS485 TO ETH (B)...

## Pricing

- **Price:** $31.70 (inc GST) — $28.82 AUD, exc GST
- **Quantity discounts:** 10+ $27.66 (exc GST) · 25+ $26.80 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 8 today, and up to 300 more in 12–19 days.

## Description

**RS485 TO ETH (C)** is an industrial serial server that bridges RS485 devices to Ethernet networks. It supports transparent TCP/UDP transmission, a Modbus RTU⇄TCP gateway, MQTT/HTTP JSON upload, and virtual COM operation. This (C) version uses a **standard RJ45 Ethernet port**, accepts **6–36 V DC** via screw terminals, and includes **power & signal isolation** for robust industrial use. DIN-rail case, compact, easy to install.

*Note: This listing is for a **non-POE** Variant*. If you need PoE power input, [choose RS485 TO POE ETH (B) instead](https://core-electronics.com.au/waveshare-industrial-serial-server-with-poe.html) (same software features, but includes PoE hardware and isolation).

### Key Features

- RS485 ⇄ Ethernet bi-directional transparent transmission
- Operating modes: **TCP Server**, **TCP Client** (can coexist with Server), **UDP**, **UDP Multicast**
- Protocol gateway: **Modbus RTU ⇄ Modbus TCP**; RS485 data → **JSON** for MQTT/HTTP upload
- **Multi-host** roll-polling support; user-defined heartbeat/registration packets; NTP time
- Web configuration, DHCP/DNS support; Windows tools for discovery, config, and virtual COM
- Industrial temperature range and DIN-rail mounting
 
### Specifications (RS485 TO ETH (C))

 | **Interfaces** | RS485 ×1 (isolated), 10/100M RJ45 Ethernet (2 kV surge) |
|---|---|
| **Power Input** | 6–36 V DC via screw terminals, with isolation |
| **Network Protocols** | IP, TCP, UDP, HTTP, ARP, ICMP, DHCP, DNS |
| **Serial Settings** | 300–115200 bps; 5–9 data bits; parity: none/odd/even/mark/space |
| **Operating Modes** | TCP Server, TCP Client, UDP, UDP Multicast (Client can coexist with Server) |
| **Gateway Functions** | Modbus RTU⇄TCP; RS485→JSON for MQTT/HTTP GET/POST |
| **Management** | Web UI; device discovery/config via Windows utility; virtual COM (VCOM) |
| **Environment** | -40 °C to +85 °C; 5–95% RH |
| **Dimensions** | 87 × 36 × 59 mm (L×W×H), DIN-rail case |

### What’s in the Box

- RS485 TO ETH (C) module ×1
 
*Power supply not included.* For DIN-rail deployments, a 12 V industrial DIN-rail PSU is recommended.

### Resources

- [Waveshare Wiki – RS485 TO ETH (C)](https://www.waveshare.com/wiki/RS485_TO_ETH_(C)#Overview)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/W/S/WS-30303-1.jpg)