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Brand: MOXA
Moxa MGate MB3280 2-Port Standard Modbus TCP Gateway
Description
How the MGate MB3280 bridges protocols
A standard two-port Modbus TCP gateway that connects RS-232/422/485 devices to Ethernet in a compact, wall- or DIN-rail-mountable case. Moxa’s own one-line description of the MGate MB3280 reads: 2-port standard Modbus gateway.
Key figures from the Moxa page: the power input is 12 to 48 VDC; operating temperature is 0 to 60°C (32 to 140°F); dimensions are 22 x 100 x 111 mm (0.87 x 3.94 x 4.37 in); weight is 360 g (0.79 lb); the enclosure is rated IP30.
Standards and approvals printed for this model include safety standard IEC 62368-1; IEC 60950-1; UL 60950-1; UL 62368-1. Approvals can differ between variants of a series, so check the one on the exact order code.
Technical specifications
| Parameter | Specification |
|---|---|
| 10/100BaseT(X) Ports (RJ45 connector) | Auto MDI/MDI-X connection |
| Magnetic Isolation Protection | 1.5 kV (built-in) |
| Ethernet Software Features: Industrial Protocols | Modbus TCP Client (Master); Modbus TCP Server (Slave) |
| Management | ARP; DHCP Client; DNS; HTTP; HTTPS; SNMPv1/v2c/v3 Trap; TCP/IP; Telnet; UDP; SMTP; SNMP Trap; NTP Client |
| Time Management | NTP Client |
| Authentication | Local database |
| Encryption | HTTPS; AES-128; AES-256; SHA-256 |
| Security Protocols | HTTPS (TLS 1.2) |
| No. of Ports | 2 |
| Connector | DB9 male |
| Serial Standards | RS-232/422/485 (software-selectable) |
| Baudrate | 50 bps to 921.6 kbps |
| Data Bits | 7, 8 |
| Parity | None; Even; Odd; Space; Mark |
| Stop Bits | 1, 2 |
| Flow Control | DTR/DSR; RTS Toggle (RS-232 only); RTS/CTS |
| RS-485 Data Direction Control | ADDC (automatic data direction control) |
| Pull High/Low Resistor for RS-485 | 1 kilo-ohm, 150 kilo-ohms |
| Terminator for RS-485 | 120 ohms |
| RS-232 | TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND |
| RS-422 | Tx+, Tx-, Rx+, Rx-, GND |
| RS-485-2w | Data+, Data-, GND |
| RS-485-4w | Tx+, Tx-, Rx+, Rx-, GND |
| Serial Software Features: Industrial Protocols | Modbus RTU/ASCII Master; Modbus RTU/ASCII Slave |
| Max. No. of Client Connections | 16 |
| Max. No. of Server Connections | 32 |
| Input Voltage | 12 to 48 VDC |
| Input Current | 250 mA @ 12 VDC |
| Power Connector | Power jack and terminal block |
| Housing | Metal |
| IP Rating | IP30 |
| Dimensions (with ears) | 22 x 100 x 111 mm (0.87 x 3.94 x 4.37 in) |
| Dimensions (without ears) | 22 x 77 x 111 mm (0.87 x 3.03 x 4.37 in) |
| Weight | 360 g (0.79 lb) |
| Operating Temperature | 0 to 60°C (32 to 140°F) |
| Storage Temperature (package included) | -40 to 85°C (-40 to 185°F) |
| Ambient Relative Humidity | 5 to 95% (non-condensing) |
| EMC | EN 55032/35 |
| EMI | CISPR 32, FCC Part 15B Class A |
| EMS | IEC 61000-4-2 ESD: Contact: 4 kV; Air: 8 kV; IEC 61000-4-3 RS: 80 MHz to 1 GHz: 3 V/m; IEC 61000-4-4 EFT: Power: 1 kV; Signal: 0.5 kV; IEC 61000-4-5 Surge: Power: 1 … |
| Safety | IEC 62368-1; IEC 60950-1; UL 60950-1; UL 62368-1 |
| Warranty Period | 5 years |
Where it fits and what to check
Choose it where the project needs straightforward Modbus conversion for two serial lines, without the advanced features of the 3270. It shares a datasheet with the four-port MB3480.
On the practical side, the housing is metal; the stated MTBF is 749,455 hrs; the warranty period is 5 years. Treat the MTBF as a manufacturer prediction under its stated method, not a guarantee for your site.
Please check the number of serial ports needed (2 for this model, 4 for MB3480) and the power supply before you place an order. Seven Star LLC supplies as an independent company and prices against the precise code requested.
Related models in the MGate MB3280 family
Other order codes listed alongside it (3 entries in total): MGate MB3180, MGate MB3280, MGate MB3480. Suffixes such as -T generally mark wide-temperature versions and fiber suffixes (M, S, MM, SS with SC or ST) mark the connector and fiber type, but the order code printed on the datasheet governs.
Documents and quotation
The Moxa datasheet for this family (moxa-mgate-mb3180-mb3280-mb3480-series-datasheet-v1.9) is attached to this page. Request a quotation with the exact order code, quantity and delivery location, and we will respond with availability.
More products in this range: Industrial Communications.
Datasheets & Documents
- Datasheet Moxa MGate MB3180-MB3280-MB3480 series datasheet v1.9 Download
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About brand
Since 1987 Moxa, based in New Taipei City, Taiwan, has built networking hardware for places where an office switch would fail: substations, wellhead panels, roadside cabinets. Seven Star LLC lists Moxa industrial Ethernet switches and fiber converters and supplies Moxa networking devices to system integrators and plant teams in Oman as an independent supplier. Each request is checked against the full Moxa model name before we quote.
Moxa switches and converters listed here
The EDS-G508E is a managed switch with eight Gigabit ports from the EDS managed line. The EDS-316-MM-SC-T is a 16-port unmanaged switch with 14 copper ports, two multi-mode SC fiber ports and the wide-temperature option (-40 to 75 C). The TCF-142-S-SC-T belongs to the TCF-142 series, which converts RS-232/422/485 serial signals to single-mode fiber. Moxa also makes serial device servers, protocol gateways, wireless devices and industrial computers, used on SCADA and telemetry networks across the GCC.
Ordering Moxa devices: what we need
The suffixes carry the specification. Send the complete model name, including fiber mode and connector (MM-SC, SS-SC, ST), the -T wide-temperature suffix and any coating or approval suffix. Add the power supply voltage, the SFP modules needed and the quantity.
Browse MOXA products by category: Industrial Communications.
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Frequently Asked Questions
What is the Moxa MGate MB3280?
Moxa lists it as: 2-port standard Modbus gateway. A standard two-port Modbus TCP gateway that connects RS-232/422/485 devices to Ethernet in a compact, wall- or DIN-rail-mountable case.
What power supply does the MGate MB3280 need?
The Moxa specification gives an input voltage of 12 to 48 VDC. Check the terminal arrangement and, where relevant, the redundant-input wiring against your panel supply before ordering.
What operating temperature range applies to the MGate MB3280?
The listed operating temperature is 0 to 60°C (32 to 140°F). Wide-temperature versions carry a -T suffix in Moxa's order codes where the series offers them, and they are separate order codes.
Which protocols does the MGate MB3280 convert?
Per Moxa's description, it is a 2-port standard Modbus gateway. Industrial protocols listed on the Ethernet side: Modbus TCP Client (Master); Modbus TCP Server (Slave).
Where is the MGate MB3280 datasheet and how do I ask for a quotation?
The official Moxa datasheet is attached to this page. Send Seven Star LLC the exact order code, quantity and delivery location for a quotation; we are an independent supplier in Muscat.
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