ATOP MB5201 Serial to Ethernet Modbus Gateway
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The MB5201 is a compact 1-port industrial Modbus gateway that converts between Modbus TCP, Modbus RTU and Modbus ASCII. It provides one software-selectable RS-232/RS-485/RS-422 serial port and one 10/100BASE-T(X) RJ-45 port, accepts a maximum of 16 Modbus TCP clients and 32 slave connections, draws under 1.5 W at 9 VDC, and operates from -40°C to 70°C.
Serial ports1 (software-selectable RS-232/RS-485/RS-422)
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- Manufacturer's warranty
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Description
The ATOP MB5201 is an entry-level industrial Modbus gateway that connects serial field devices to Ethernet networks. It supports the four most common interfaces, RS-232, RS-422, RS-485 and Ethernet, so you can bridge almost any serial meter, PLC or RTU onto a Modbus TCP network. A configuration utility lets you select the hardware interface and slot the gateway into existing communication infrastructure quickly, keeping commissioning simple. Industrial EMC protection and wide-temperature operation make it dependable in plant rooms, cabinets and utility sites rather than the office. As the entry point to ATOP’s serial and Modbus gateway range, the MB5201 is a cost-effective way to modernise serial-only equipment. See our entry-level serial and Modbus gateways.
Manufacturer datasheet (PDF)
MB5201 specifications
| Serial ports | 1 |
|---|---|
| Serial mode | RS-232/RS-485 (2 and 4 wire)/RS-422, software selectable |
| Serial connector | 9-pin D-Sub9 (male, -DB) or 5-pin terminal block (-TB) |
| Ethernet port | 1x 10/100BASE-T(X) RJ-45 |
| Ethernet compliance | IEEE 802.3 for 10BASE-T; IEEE 802.3u for 100BASE-T(X) |
| Baud rate | 1200~230,400 bps (RS-485 4-wire allows up to 921,600 bps) |
| Data bits / stop bits | 7, 8 / 1, 2 |
| Parity | None, Odd, Even, Space, Mark |
| Flow control | None, Xon/Xoff, RTS/CTS (RS-232 only) |
| Modbus | TCP/RTU/ASCII |
| Modbus modes | Ethernet: Modbus TCP server/client (or VCOM); Serial: Modbus RTU/ASCII (master/slave) |
| Maximum clients/slaves | Modbus TCP: maximum 16 clients; maximum 32 slave connections |
| Network protocols | TCP, IPv4, UDP, DHCP Client, HTTP, HTTPS, Telnet, ARP, SNMPv1/v2c/v3 |
| Configuration | Atop Management Utility, Web UI, Telnet, CLI |
| Input voltage | 3-pin 5.08mm lockable terminal block: 9-30VDC; DC jack: 5VDC |
| Power consumption | <1.5W @9VDC |
| Power redundancy | Yes |
| Reverse polarity protection | Yes |
| Dimensions (W x D x H) | 65mm x 78mm x 28mm (without wall-mount part) |
| Weight | 185g |
| Installation | Wall-mount or DIN-Rail (optional kit) |
| Operating temperature | -40°C ~ 70°C (-40°F ~ 158°F) |
| Storage temperature | -40°C ~ 85°C |
| Ambient relative humidity | 5 ~ 95% RH (non-condensing) |
| Safety | EN 60950-1 / EN62368-1 |
| MTBF | 25.29 years (MIL-HDBK-217F, 25 degrees C) |
| Warranty | 5 years |
Specifications taken from the manufacturer datasheet.
Which version do I need?
Two ordering variants differ only by serial connector: MB5201-DB (1P1MB520100001G) with a male DB9, and MB5201-TB (1P1MB520100002G) with a 5-pin terminal block. UK buyers can order the UK-plug DC jack power adapter UVE305-0510(UK-DC), part number 50500051500023G, 100~240VAC input, 1.0A @ 5 VDC output.
Typical applications for the MB5201
- Connecting a single Modbus RTU or ASCII serial device to a Modbus TCP network
- Converting between Modbus ASCII and Modbus RTU devices on mixed serial infrastructure
- Modbus ID routing to integrate an existing complex Modbus configuration into one network
- VirtualCOM redirection so existing Windows or Linux serial applications reach the device over Ethernet
- Field-mount installation inside a small panel on wall or DIN-rail
- Serial-to-Ethernet tunnelling between two remote sites
Complete the stack
Products that work with this one — connect it, power it, and get it online.
MB5201 — frequently asked questions
How many Modbus devices can one MB5201 serve?
On the Ethernet side it supports a maximum of 16 Modbus TCP clients and a maximum of 32 slave connections. On the serial side it has a single port, which can act as Modbus RTU/ASCII master or slave.
Does the single port do RS-422 and 4-wire RS-485?
Yes. The port is software-selectable between RS-232, RS-485 (2-wire and 4-wire) and RS-422. Baud rate is 1200 to 230,400 bps, and RS-485 4-wire allows up to 921,600 bps.
What power input does it take, and is it redundant?
A 3-pin 5.08 mm lockable terminal block accepting 9-30 VDC, plus a 5 VDC DC jack, and the two inputs are redundant. Consumption is under 1.5 W at 9 VDC, with reverse polarity protection.
Should I order the -DB or the -TB version?
MB5201-DB (1P1MB520100001G) terminates the serial port on a male DB9; MB5201-TB (1P1MB520100002G) uses a 5-pin terminal block. An ADP-DB9(F)-TB5 converter (59906231G) is available if you need to adapt one to the other.
How is it mounted, and how cold can it run?
Wall-mount as standard, or DIN-rail using the optional DK-25 plastic kit (30200000000022G). Operating temperature is -40°C to 70°C at 5 to 95% RH, non-condensing; it weighs 185 g.
How much does the ATOP MB5201 Serial to Ethernet Modbus Gateway cost in the UK?
The ATOP MB5201 Serial to Ethernet Modbus Gateway is supplied to order and priced on application. Send a quote request and we confirm the price and lead time in writing, usually the same working day. No account is needed. Indiott is a UK distributor invoicing with VAT (PSI Technologies Ltd, VAT GB 730 2340 83).
What is the lead time and delivery cost for the ATOP MB5201 Serial to Ethernet Modbus Gateway?
The ATOP MB5201 Serial to Ethernet Modbus Gateway is supplied to order. We confirm the lead time in writing with your quote, before you commit to anything. UK delivery is a flat £14.25 per order ex VAT, whatever the weight or how many items you order. We ship to GB and the EU and provide a VAT invoice with every order.
