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🔌 Tiny device, massive industrial impact — connect smarter, not harder!
The PUSR USR-DR134 is a compact DIN rail-mounted serial device server that converts RS485 serial data to Ethernet at 100 Mbps. Designed for industrial automation, it supports Modbus RTU to TCP gateway functionality and advanced network features like DHCP and heartbeat packets. Its ultra-small form factor and easy installation make it ideal for integrating legacy serial devices into modern Ethernet networks, enabling local or remote monitoring via PLCs and SCADA systems.
| ASIN | B0D4M4LQX2 |
| Best Sellers Rank | #17 in Computer Networking Device Servers |
| Brand | PUSR |
| Color | Red |
| Compatible Devices | Desktop |
| Customer Reviews | 2.1 out of 5 stars 3 Reviews |
| Data Link Protocol | Ethernet |
| Data Transfer Rate | 100 megabits_per_second |
| Hardware Interface | Ethernet |
| Manufacturer | PUSR |
| Model Number | DR134(RS485 to Ethernet) |
| Number of Items | 1 |
| Unit Count | 1 Count |
| Warranty Description | 2 years |
A**.
Does Not Support MQTT
Listing falsely states it supports MQTT. A newer model does, but the one shipped does not and can’t be upgraded via firmware to support it. Support will send you a link to another site to purchase the updated model.
S**D
Compact and Versatile RS485 to Ethernet Converter
I recently integrated the PUSR USR-DR134 "Lipstick" RS485 to Ethernet Serial Device Server into my industrial automation setup, and it's been performing exceptionally well. Despite its compact size—comparable to a lipstick tube—it offers robust functionality. The device facilitates seamless two-way transparent data transmission between RS485 serial ports and Ethernet, supporting protocols like MQTT, TCP, UDP, and HTTP. Its Modbus gateway capability allows for easy conversion between Modbus RTU and Modbus TCP protocols, simplifying communication with PLCs and SCADA systems. Installation was straightforward, thanks to the DIN rail mounting and push-type connectors. Operating reliably in various environments, this converter has proven to be a reliable solution for integrating serial devices into an Ethernet network
K**.
NOT MODBUS Compliant! Does not support 125 register polling
This gateway works as a modbus bridge both in IP master or RTU master modes. However it only supports modbus queries of 123 registers or less. Modbus standard is 125 registers. If you are doing a single request of less than that it will work but if you are polling large, sequential, register blocks this device will fail. I've emailed support with the issue with no answer. I will update my review
Trustpilot
1 month ago
2 days ago