Moxa
Moxa MGate MB3480 4-port serial Modbus gateway
Converts Modbus TCP to RTU/ASCII across one Ethernet and four serial ports handling 16 masters with 32 requests each
- TypeCable Modem
- Converts Modbus TCP to RTU/ASCII for legacy integration
- Four RS-232/422/485 ports connect multiple serial devices
- Auto-Device Routing simplifies gateway configuration
- Route by TCP port or IP for flexible deployment
- 16 masters with 32 requests each handle heavy traffic
4-port Modbus gateway for serial networks
The MGate MB3480 connects up to four RS-232/422/485 serial devices to a single Ethernet network. It translates Modbus RTU or ASCII traffic into Modbus TCP so legacy field equipment can be managed from modern SCADA or HMI software. Engineers commissioning new sites or extending brown-field plants use it to avoid rewiring existing serial loops.
Replaces multi-drop serial concentrators
A single Ethernet uplink replaces a daisy-chain of RS-485 converters and removes the distance and node-count limits of copper serial buses. The jump is worth it when you need to segment traffic by TCP port or IP address, or when you must support 16 simultaneous TCP masters each issuing up to 32 concurrent requests. Auto-Device Routing cuts configuration time on large deployments.
Sustained multi-master throughput
Under continuous load the gateway maintains deterministic Modbus TCP conversion across all four serial ports without head-of-line blocking. Each master session keeps its own request queue so a slow RTU slave cannot stall traffic destined for faster devices. The hardware handles the full 16-master, 32-request-per-master ceiling without dropping frames or requiring a reboot.
Highlights
- Converts Modbus TCP to RTU/ASCII for legacy integration
- Four RS-232/422/485 ports connect multiple serial devices
- Auto-Device Routing simplifies gateway configuration
- Route by TCP port or IP for flexible deployment
- 16 masters with 32 requests each handle heavy traffic
Specifications
| Type | Cable Modem |
|---|
Questions about this item
What serial interfaces are on the four ports of the MGate MB3480?
Each of the four ports supports RS-232, RS-422 and RS-485 for connection to Modbus RTU or ASCII devices.
How is the gateway configured and which step is often missed?
Use the web interface to enable Auto-Device Routing and set the routing rule by TCP port or IP address; the step often missed is applying the routing rule after the serial parameters are saved.
What ongoing check does the MGate MB3480 need after deployment?
Monitor the 16 concurrent TCP masters and the 32 simultaneous requests per master to confirm the gateway is not reaching its session limits.
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