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Brand: MOXA
Moxa UPort 1250-G2 2-Port RS-232/422/485 USB-to-Serial Converter
Description
How the UPort 1250-G2 extends a link
UPort 1250-G2 is listed by Moxa as: 2-port RS-232/422/485 USB-to-serial converter, 0 to 60°C operating temperature. A USB-to-serial converter that adds two software-selectable RS-232/422/485 ports to a laptop or industrial PC.
Key figures from the Moxa page: the power input is 5 VDC by USB bus power; operating temperature is 0 to 60°C (32 to 140°F); dimensions are 75.8 x 25.0 x 111.0 mm (2.98 x 0.98 x 4.37 in); weight is 259 g (0.57 lb); the enclosure is rated IP20.
Standards and approvals printed for this model include safety standard IEC 62368-1; EN 62368-1; UL 62368-1 (CB); KC. Approvals can differ between variants of a series, so check the one on the exact order code.
Technical specifications
| Parameter | Specification |
|---|---|
| USB Standards | USB 3.2 Gen 1; USB 1.1/2.0 compliant |
| Speed | 5 Gbps, 480 Mbps, 12 Mbps |
| No. of USB Ports | 1 |
| USB Connector | USB Type B |
| Connector | DB9 male |
| Baudrate | 50 bps to 921.6 kbps (supports non-standard baudrates) |
| FIFO | 512 bytes |
| Parity | None, Even, Odd, Space, Mark |
| Data Bits | 5, 6, 7, 8 |
| Stop Bits | 1, 1.5, 2 |
| Pull High/Low Resistor for RS-485 | 1 kilo-ohm, 150 kilo-ohms |
| Terminator for RS-485 | 120 ohms |
| Flow Control | RTS/CTS, XON/XOFF |
| RS-485 Data Direction Control | Automatic Data Direction Control (ADDC) |
| Surge | 0.5 kV |
| Isolation | 2 kV (I models) |
| Serial Standards | RS-232/422/485 |
| No. of Ports | 2 |
| RS-232 | TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND |
| RS-422 | Tx+, Tx-, Rx+, Rx-, GND |
| RS-485-4w | Tx+, Tx-, Rx+, Rx-, GND |
| RS-485-2w | Data+, Data-, GND |
| Input Voltage | 5 VDC by USB bus power |
| Input Current | UPort 1250-G2 models; 320 mA @ USB 3; 160 mA @ USB 2; ; UPort 1250I-G2 models:; 400 mA @ USB 3; 240 mA @ USB 2 |
| Housing | Metal |
| IP Rating | IP20 |
| Dimensions | 75.8 x 25.0 x 111.0 mm (2.98 x 0.98 x 4.37 in) |
| Weight | 259 g (0.57 lb) |
| Operating Temperature | 0 to 60°C (32 to 140°F) |
| Storage Temperature | -40 to 75°C (-40 to 167°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; IEC 61000-4-5 Surge: Power: 1 kV, Signal: 0.5 … |
| Safety | IEC 62368-1; EN 62368-1; UL 62368-1 (CB); KC |
| Freefall | IEC 60068-2-31 |
| Vibration | IEC 60068-2-6; IEC 60068-2-64 |
| Shock | IEC 60068-2-27 |
| Green Product | RoHS, CRoHS, WEEE |
Selection and installation notes
It is widely used by service engineers who need dependable COM ports on a laptop to configure drives, PLCs and analysers; it is powered from the USB bus.
On the practical side, the housing is metal; the stated MTBF is 2,142,392 hrs. Treat the MTBF as a manufacturer prediction under its stated method, not a guarantee for your site.
Please check the operating system driver availability and the -T temperature variant before you place an order. Seven Star LLC supplies as an independent company and prices against the precise code requested.
Related models in the UPort 1250-G2 family
Moxa groups the UPort 1250-G2 with 3 related order codes under one family: UPort 1250-G2, UPort 1250-G2-T, UPort 1250I-G2, UPort 1250I-G2-T. 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
Download the official Moxa datasheet (moxa-uport-1200-g2-series-datasheet-v1.2) from this page and send us your order code, quantity and destination for a quotation.
More products in this range: Industrial Communications.
Datasheets & Documents
- Datasheet Moxa UPort 1200-G2 series datasheet v1.2 Download
Reviews (0)
About brand
Moxa is the Taiwanese maker of industrial networking equipment: Ethernet switches, serial device servers, protocol gateways, media converters, secure routers and remote I/O. It was founded in Taiwan in 1987 and started with serial communication products before moving into industrial Ethernet. It is headquartered in Taipei.
Seven Star LLC is an independent supplier in Muscat. We list Moxa switches, serial servers, gateways and converters, and supply them to control system integrators, utilities, oil and gas and building automation projects in Oman and the GCC by exact model.
Moxa at a glance
| Established | 1987, Taiwan |
|---|---|
| Headquarters | Taipei, Taiwan |
| First products | Serial communication boards and serial connectivity |
| Product families | Unmanaged, managed and rackmount industrial Ethernet switches, serial device servers, Modbus and fieldbus gateways, media converters, serial converters, secure routers, remote I/O and industrial computers |
Moxa products we list
| Family | Models | Typical use |
|---|---|---|
| Unmanaged switches | EDS-205A, EDS-208A, EDS-2008-EL, EDS-2010-ML, EDS-308, EDS-316, EDS-G2005-EL, EDS-G205, EDS-G308, EDS-P206A PoE | Simple plug-and-play networks inside control panels |
| Managed switches | EDS-405A, EDS-408A, EDS-508A, EDS-510A, EDS-510E, EDS-518A, EDS-528E, EDS-G508E, EDS-G509, EDS-G512E, ICS-G7528A rackmount | Redundant ring networks, VLANs and diagnostics for SCADA and DCS |
| Serial device servers | NPort 5110A, 5150A, 5210A, 5250A, 5410, 5450, 5610-8, 5650-8, 6150, IA5150A | Putting RS-232/422/485 devices on an Ethernet network |
| Protocol gateways | MGate MB3180, MB3170, MB3280, MB3270, 5101-PBM-MN, 5105-MB-EIP, 5109 DNP3, 5114 IEC 104 | Linking Modbus RTU/TCP, PROFIBUS, EtherNet/IP, DNP3 and IEC 60870-5-104 systems |
| Converters, routers and I/O | IMC-21A, IMC-101, IMC-21GA, TCF-142, TCC-100, TCC-80, TCC-120, EDR-G9010 router, ioLogik E2210 | Fibre links over long distances, serial conversion, network security and remote I/O |
The choice between switch types follows the network. An unmanaged switch simply forwards traffic and suits a small, isolated panel. A managed switch adds redundancy protocols (Moxa's Turbo Ring recovers a broken ring in milliseconds), VLANs to separate traffic, port mirroring and alarms, which a SCADA or DCS network needs. The suffix on a Moxa model also matters: "-T" means a wide operating temperature range (typically -40 to 75 °C), which is the safe choice for outdoor cabinets in the Gulf summer. "-MM-SC" or "-S-SC" means multi-mode or single-mode fibre with SC connectors.
Where Moxa products are used
In Oman and the GCC, Moxa equipment connects RTUs, PLCs, meters and protection relays in oil and gas fields, electrical substations, water and wastewater SCADA, transport, and building and energy management systems.
Ordering Moxa products: what we need
Send the complete model including all suffixes (for example EDS-508A-MM-SC-T), the quantity, and for fibre models the fibre type and distance. For gateways, tell us which two protocols need to be linked.
Facts checked against Moxa company information, October 2026.
Browse MOXA products by category: Industrial Communications.
Related products
Frequently Asked Questions
What is the Moxa UPort 1250-G2?
Moxa lists it as: 2-port RS-232/422/485 USB-to-serial converter, 0 to 60°C operating temperature. A USB-to-serial converter that adds two software-selectable RS-232/422/485 ports to a laptop or industrial PC.
What power supply does the UPort 1250-G2 need?
The Moxa specification gives an input voltage of 5 VDC by USB bus power. Check the terminal arrangement and, where relevant, the redundant-input wiring against your panel supply before ordering.
What operating temperature range applies to the UPort 1250-G2?
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.
What does the UPort 1250-G2 connect?
Moxa describes it as: 2-port RS-232/422/485 USB-to-serial converter, 0 to 60°C operating temperature.
Where is the UPort 1250-G2 datasheet and how do I ask for a quotation?
You can download the Moxa datasheet from this page. For a quotation, send us the full order code, quantity and destination; Seven Star LLC is an independent supplier based in Muscat.
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