> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# 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.

## How to buy

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- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## 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)