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Brand: MOXA
Moxa NPort 5250A 2-Port RS-232/422/485 Serial Device Server
Description
How the NPort 5250A puts serial devices on Ethernet
NPort 5250A is listed by Moxa as: 2-port RS-232/422/485 device server, 0 to 60°C operating temperature. A two-port device server that gives two independent serial devices their own IP-based channel, with software-selectable RS-232, RS-422 and RS-485 on each port.
On the datasheet side, the power input is 12 to 48 VDC; operating temperature is 0 to 60°C (32 to 140°F); dimensions are 100 x 111 x 26 mm (3.94 x 4.37 x 1.02 in); weight is 340 g (0.75 lb).
Standards and approvals printed for this model include safety standard EN 62368-1; IEC 62368-1; UL 60950-1. 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) | 1 |
| Magnetic Isolation Protection | 1.5 kV (built-in) |
| Management | ARP; BOOTP; DHCP Client; DNS; HTTP; HTTPS; ICMP; IPv4; LLDP; SMTP; SNMPv1/v2c; Telnet; TCP/IP; UDP |
| Filter | IGMP v1/v2 |
| Authentication | Local database |
| Encryption | AES-128; RSA-1024; SHA-256; HTTPS; SHA-1 |
| Security Protocols | HTTPS (TLS 1.2) |
| Connector | DB9 male |
| No. of Ports | 2 |
| Serial Standards | RS-232; RS-422; RS-485 |
| Operation Modes | Disabled; Ethernet Modem; Pair Connection; Real COM; Reverse Telnet; RFC2217; TCP Client; TCP Server; UDP |
| Bitrate | Supports standard baudrates (unit=bps): 50, 75, 110, 134, 150, 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 19200, 38400, 57600, 115200, 230.4k, 460.8k, 921.6k |
| Data Bits | 5, 6, 7, 8 |
| Stop Bits | 1, 1.5, 2 |
| Parity | None, Even, Odd, Space, Mark |
| Flow Control | RTS/CTS (RS-232 only); DTR/DSR (RS-232 only) |
| Pull High/Low Resistor for RS-485 | 1 kilo-ohm, 150 kilo-ohms |
| RS-485 Data Direction Control | ADDC (automatic data direction control) |
| Terminator for RS-485 | 120 ohms |
| RS-232 | TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND |
| RS-422 | Tx+, Tx-, Rx+, Rx-, GND |
| RS-485-4w | Tx+, Tx-, Rx+, Rx-, GND |
| RS-485-2w | Data+, Data-, GND |
| Input Current | 119 mA @ 12 VDC |
| Input Voltage | 12 to 48 VDC |
| No. of Power Inputs | 2 |
| Power Connector | 1 removable 3-contact terminal block(s); Power input jack |
| Automatic Reboot Trigger | Built-in WDT |
| Housing | Metal |
| Dimensions (with ears) | 100 x 111 x 26 mm (3.94 x 4.37 x 1.02 in) |
| Dimensions (without ears) | 77 x 111 x 26 mm (3.03 x 4.37 x 1.02 in) |
| Weight | 340 g (0.75 lb) |
| Installation | Desktop; DIN-rail mounting (with optional kit); Wall mounting |
| Operating Temperature | 0 to 60°C (32 to 140°F) |
| Storage Temperature (package included) | -40 to 75°C (-40 to 167°F) |
| Ambient Relative Humidity | 5 to 95% (non-condensing) |
| EMC | EN 55032/35 |
| EMS | IEC 61000-4-2 ESD: Contact: 8 kV; Air: 15 kV; IEC 61000-4-3 RS: 80 MHz to 1 GHz: 10 V/m; IEC 61000-4-4 EFT: Power: 2 kV; Signal: 1 kV; IEC 61000-4-5 Surge: Power: 2 … |
| EMI | CISPR 32, FCC Part 15B Class A |
| Safety | EN 62368-1; IEC 62368-1; UL 60950-1 |
| Green Product | RoHS, CRoHS, WEEE |
| Warranty Period | 5 years |
Selection and installation notes
It is a common replacement for multiport serial cards and a practical way to connect two instruments such as a chromatograph and a flow computer to a SCADA host.
On the practical side, mounting is listed as desktop; din-rail mounting (with optional kit); wall mounting; the housing is metal; the stated MTBF is 847,750 hrs; the warranty period is 5 years. Treat the MTBF as a manufacturer prediction under its stated method, not a guarantee for your site.
What to confirm before ordering: the voltage and temperature grade, and whether DIN-rail mounting kits are required. Our team in Muscat works from the exact code on your enquiry, as an independent supplier.
Related models in the NPort 5250A family
Moxa groups the NPort 5250A with 5 related order codes under one family: NPort 5210A, NPort 5210A-T, NPort 5230A, NPort 5230A-T, NPort 5250A, NPort 5250A-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.
Typical applications for a two-port device server
The NPort 5250A connects serial equipment that has no network interface of its own to an Ethernet network. Typical examples are analysers, flow computers, weighing indicators, barcode readers, meters and older PLCs that communicate over RS-232, RS-422 or RS-485. With two independently configurable ports, one unit can serve two devices with different serial standards, such as an RS-232 instrument on one port and an RS-485 multi-drop line on the other. This makes it useful in control rooms, substations and process skids where legacy equipment must be integrated into a modern SCADA or monitoring system.
Choosing the right operation mode
The operation mode decides how the host software sees the serial device. Real COM mode creates virtual COM ports on the host computer, so existing software that expects a local serial port can work without changes. TCP Server and TCP Client modes suit applications that talk directly over TCP sockets, while UDP mode suits broadcast or multicast-style data. Pair Connection links two device servers so that two serial devices can communicate over the network as if they were cabled directly. Choose the mode based on the host application, not on the serial device alone.
Installation and commissioning considerations
Plan the power supply within the stated input voltage range, and consider using both power inputs where supply redundancy is important. For RS-485 lines, decide where termination and pull-high or pull-low resistors are needed based on the network layout and the position of the device server on the bus. Set the serial parameters on each port to match the connected device exactly, including baud rate, data bits, parity and stop bits. Assign a fixed IP address or a DHCP reservation so that the host always finds the device server. Before handing over, test communication on both ports with the real equipment.
Network security practice
Because the device server sits on the plant network, treat it like any other networked device. Apply your site rules for network segmentation, change default settings during commissioning, and limit access to approved personnel using the authentication options listed above. Record the configuration so the unit can be restored quickly after replacement.
Also confirm the RS-485 wiring mode, two-wire or four-wire, on each port before connecting field devices.
How to request a quotation
Quote the exact order code NPort 5250A or NPort 5250A-T, the quantity and destination. Mention the mounting method you plan to use.
Documents and quotation
Download the official Moxa datasheet (moxa-nport-5200a-series-datasheet-v1.10) 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 NPort 5200A series datasheet v1.10 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 NPort 5250A?
Moxa lists it as: 2-port RS-232/422/485 device server, 0 to 60°C operating temperature. A two-port device server that gives two independent serial devices their own IP-based channel, with software-selectable RS-232, RS-422 and RS-485 on each port.
What power supply does the NPort 5250A 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 NPort 5250A?
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 serial interfaces does the NPort 5250A offer?
The datasheet lists RS-232; RS-422; RS-485 on DB9 male, with 2 serial port(s).
Where is the NPort 5250A 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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