4-Ch RS485 to RJ45 Ethernet Serial Server (Isolated, Rail-Mount)
Bridge four isolated RS485 buses onto one network cable, with Modbus and MQTT gateway modes built in.
Available with a lead time
Expect dispatch between Aug 24 and Aug 31
Four independent RS485 channels, each receiving and transmitting at the same time, bridged onto a single 10/100M Ethernet drop.
Adding more field devices to a single-port serial server means sharing one bus, arbitrating turns and living with collisions. Here each channel carries its own traffic in parallel, so a slow energy meter on one port cannot stall a PLC on another.
Onboard power and signal isolation, TVS suppression, a resettable fuse and protection diodes keep the network side and the field side apart — the protection that matters when RS485 runs the length of a plant. The RJ45 adds 2 KV surge protection, and the sand-blasted anodised aluminium enclosure clips to DIN rail or bolts to a wall.
Beyond transparent transmission it operates as a Modbus gateway, an MQTT gateway and an RS485-to-JSON acquisition gateway, all configurable from a web browser. Multi-host roll-polling identifies and answers each network device separately, and DHCP, DNS and NTP are supported.
Features
Runs four RS485 buses concurrently without arbitration — each channel receives and transmits independently, so added devices do not slow the ones already there
Survives noisy industrial wiring thanks to onboard power and signal isolation, built-in TVS suppression, a resettable fuse and protection diodes, plus 2 KV surge protection on the Ethernet port
Accepts a wide DC 6–45 V input through a screw terminal that stays put under vibration, unlike a barrel jack
Replaces a separate gateway appliance: serial server, Modbus gateway, MQTT gateway and RS485-to-JSON conversion in a single unit
Publishes straight to cloud brokers over MQTT or HTTP POST/GET, with user-defined heartbeat and registration packets for device identification
Answers several network hosts separately, removing the crosstalk you get when multiple masters poll the same field devices
Deploys in minutes on DIN rail or wall mount in a sand-blasted, anodised aluminium enclosure measuring 91 × 64.5 × 24.2 mm
Keeps working from −40 °C to 85 °C, suiting unconditioned cabinets and outdoor enclosures
Specifications
Property | Specification |
|---|---|
Product type | Serial server, Modbus gateway, MQTT gateway |
Serial ports | 4 × isolated RS485, independent simultaneous receive and transmit |
Ethernet | RJ45, 10/100M auto-negotiation, 2 KV surge protection (no PoE on this version) |
Isolation | Power isolation and signal isolation |
Power input | DC 6–45 V via screw terminal |
Baud rate | 300–115200 bps |
Data bits | 5–9 bits |
Parity | None, odd, even, mark, space |
Protocols | Ethernet, IP, TCP, UDP, HTTP, ARP, ICMP, DHCP, DNS |
Operating modes | TCP server, TCP client (coexisting with TCP server), UDP, UDP multicast |
Configuration | Host software, web browser, device management function library |
Operating temperature | −40 °C to 85 °C |
Humidity | 5–95% relative humidity |
Dimensions | 91.0 × 64.5 × 24.2 mm |
Weight | 187 g |
Resources
What's Included
1x 4-Ch RS485 to RJ45 Ethernet Serial Server
1x Rail-mount buckle
1x Screwdriver
1x Screws pack
Exact shipping can be calculated on the view cart page (no login required).
Products that weigh more than 0.5 KG may cost more than what's shown (for example, test equipment, machines, >500mL liquids, etc).
We deliver Australia-wide with these options (depends on the final destination - you can get a quote on the view cart page):
- $3+ for Stamped Mail (typically 10+ business days, not tracked, only available on selected small items)
- $7+ for Standard Post (typically 6+ business days, tracked)
- $11+ for Express Post (typically 2+ business days, tracked)
- Pickup - Free! Only available to customers who live in the Newcastle region (must order online and only pickup after we email to notify you the order is ready). Orders placed after 2PM may not be ready until the following business day.
Non-metro addresses in WA, NT, SA & TAS can take 2+ days in addition to the above information.
Some batteries (such as LiPo) can't be shipped by Air. During checkout, Express Post and International Methods will not be an option if you have that type of battery in your shopping cart.
International Orders - the following rates are for New Zealand and will vary for other countries:
- $12+ for Pack and Track (3+ days, tracked)
- $16+ for Express International (2-5 days, tracked)
If you order lots of gear, the postage amount will increase based on the weight of your order.
Our physical address (here's a PDF which includes other key business details):
40 Aruma Place
Cardiff
NSW, 2285
Australia
Take a look at our customer service page if you have other questions such as "do we do purchase orders" (yes!) or "are prices GST inclusive" (yes they are!). We're here to help - get in touch with us to talk shop.
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