{"product_id":"rs232-485-422-to-rj45-ethernet-module-poe-industrial-gateway","title":"RS232\/485\/422 to RJ45 Ethernet Module - PoE Industrial Gateway","description":"\u003cp\u003eIn this review the Waveshare RS232\/485\/422 to RJ45 Ethernet Module is assessed as a compact industrial serial-to-Ethernet gateway aimed at engineers and integrators who need reliable protocol conversion and flexible network options. The biggest reason to consider it is its combination of multiport serial support, PoE power option and built-in protocol conversions like Modbus and MQTT, which together make it a practical choice for upgrading legacy instruments to IP networks.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eMulti-serial support:\u003c\/strong\u003e Provides RS232, RS485 and RS422 interfaces so a single module can connect to a wide range of industrial instruments without extra adaptors.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eEthernet with PoE:\u003c\/strong\u003e Includes an RJ45 Ethernet port that supports IEEE 802.3af PoE so the device can be powered over the network for cleaner installations.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eProtocol gateways:\u003c\/strong\u003e Functions as a serial server, Modbus gateway and MQTT gateway enabling direct conversion between serial protocols, Modbus and JSON for IoT integration.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eFlexible power inputs:\u003c\/strong\u003e Accepts power via DC jack (5.5mm outer, 2.1mm inner) or terminal block across a wide DC 6-36V range for installation versatility.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eMounting and form factor:\u003c\/strong\u003e Compact case with rail-mount support that fits in control cabinets and saves panel space during deployments.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eNetwork features:\u003c\/strong\u003e Supports TCP server\/client, UDP and multicast, plus NTP for time synchronization and user-defined heartbeat packets for robust cloud communication.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis module is best for system integrators, automation engineers and field technicians who need to bring serial instruments online for data acquisition, remote monitoring or IoT projects. It suits installations where PoE is desired to reduce wiring or when multiple protocol conversions (Modbus, MQTT, JSON) simplify upstream systems.\u003c\/p\u003e\n\u003cp\u003eIt is less appropriate for hobbyists who expect extensive step-by-step documentation; customers report mixed experiences with paperwork and there is a learning curve when configuring advanced gateway functions. If plug-and-play consumer simplicity is required, a product with dedicated hands-on support may be a better choice.\u003c\/p\u003e\n\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eWide serial interface support reduces the need for multiple adapters in mixed-device environments.\u003c\/li\u003e\n \u003cli\u003ePoE capability and wide DC input options provide flexible power choices for industrial sites.\u003c\/li\u003e\n \u003cli\u003eIntegrated Modbus, MQTT and JSON conversion streamlines IoT and cloud integration workflows.\u003c\/li\u003e\n \u003cli\u003eCompact, rail-mountable case makes cabinet mounting straightforward and space efficient.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eDocumentation quality receives mixed feedback, which can slow initial setup for less experienced users.\u003c\/li\u003e\n \u003cli\u003eAdvanced configuration requires familiarity with network and serial protocol concepts to get the most value.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n \u003ctr\u003e\n\u003ctd\u003eInterfaces\u003c\/td\u003e\n\u003ctd\u003eRS232, RS485, RS422, RJ45 Ethernet\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003ePower input\u003c\/td\u003e\n\u003ctd\u003ePoE (IEEE 802.3af), DC jack (5.5mm OD, 2.1mm ID), terminal block\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eDC input range\u003c\/td\u003e\n\u003ctd\u003eDC 6-36V\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eRail-mount support\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eNetwork modes\u003c\/td\u003e\n\u003ctd\u003eTCP server\/client, UDP, UDP multicast\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eGateway functions\u003c\/td\u003e\n\u003ctd\u003eSerial server, Modbus gateway, MQTT gateway, RS485 to JSON\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eTime sync\u003c\/td\u003e\n\u003ctd\u003eSupports NTP for network time\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Waveshare RS232\/485\/422 to RJ45 Ethernet Module is a cost-effective industrial gateway for bringing legacy serial devices into modern networks. It delivers useful protocol conversions, PoE support and flexible power options, making it a solid choice for automation projects where reliable serial-to-IP conversion is needed; buyers should be prepared to spend time on configuration due to limited documentation.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this module support PoE?\u003c\/strong\u003e\u003cbr\u003eYes. It supports PoE power delivery compliant with IEEE 802.3af so the device can be powered through the Ethernet link.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it convert Modbus to MQTT or JSON?\u003c\/strong\u003e\u003cbr\u003eYes. The module includes Modbus gateway and MQTT\/JSON conversion functions to integrate serial Modbus devices with cloud services.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat power options are available?\u003c\/strong\u003e\u003cbr\u003ePower can be supplied via PoE, the DC jack (5.5mm outer, 2.1mm inner) or a screw terminal block, with a DC input range of 6 to 36V.\u003c\/p\u003e","brand":"waveshare","offers":[{"title":"Default Title","offer_id":48227493576923,"sku":"B0BN61G4VF","price":35.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51_H2S5htrL._AC_SL1500.jpg?v=1770913795","url":"https:\/\/gearmusthave.com\/products\/rs232-485-422-to-rj45-ethernet-module-poe-industrial-gateway","provider":"GearMustHave","version":"1.0","type":"link"}