Advanced embedded security 
MB5904D embeds IPsec VPN Encryption, that allows you to tunnel your data securely throught the internet and prevent unauthorized control of your Serial Devices by malicious people. 
 

| Specifications | |
| Network Interface | |
| Speed | IEEE 802.3 10BaseT IEEE 802.3u 100BaseT(X) IEEE 802.3u for 100Base-X (SFP version only) IEEE 802.3z for 1000Base-X (SFP version only)  | 
| PoE standard supported | IEEE 802.3 af | 
| LAN Mode | Dual Subnets or Network Redundancy | 
| Connector ports | 2x 10/100BASE-T(X) RJ-45 or 2x 100/1000 Base-X SFP Slots (SFP version)  | 
| Serial Interface | |
| Connector | D-Sub9 RS-232/422/485 software selectable (DB models) 5.08mm 5-Pin Terminal block RS-232/422/485 sw selectable (TB models)  | 
| Port(s) | 4 + 1 console port (RJ45) | 
| Baud rate | 1200~921,600 bps software selectable | 
| Parity | None, Odd, Even, Mark, Space | 
| Data bits | 7,8 software selectable | 
| Stop Bit | 1,2 software selectable | 
| Flow Control | None, Xon/Xoff, RTS/CTS (RS-232 only) | 
| Isolation | 3 KV (Sis versions only) | 
| USB Interface | |
| Speed | USB 2.0 | 
| Connector | USB A Type *1 | 
| Power Characteristic | |
| Connector | 7-Pin 5.08mm Lockable Terminal Block | 
| Input Voltage | Dual 12 - 48VDC (non-PoE Models); or through Ethernet Cable (PoE versions) | 
| Input Current (@ 12VDC) | 0.65 A | 
| Power Consumption | Approximately 6 W (Max) | 
| Reverse Polarity Protection | Yes | 
| Redundancy | Yes | 
| Relay Output | 1A@30 VDC (normal open) | 
| Approval | |
| EMC | FCC Part 15, Subpart B, Class A EN 55032 EN 61000-3-2 EN 61000-3-3 EN 61000-6-2, EN 61000-6-4 EN 55024  | 
| Safety | UL61010-2-201 | 
| Shock | IEC 60068-2-27 | 
| Drop(freefall) | IEC 60068-2-32 | 
| Vibration | IEC 60068-2-64 | 
| RoHS II | Yes | 
| MTBF | TBD | 
| Warranty | 5 Years | 
| Environment | |
| Operating | -40°C ~ 85°C (-40°F ~ 185°F) | 
| Storage | -40°C ~ 85°C (-40°F ~ 185°F) | 
| Humidity | 5~95%RH(Non-condensing) | 
| Mechanical | |
| Housing | IP30 SPCC housing | 
| Dimensions (W x H x D) | 55mm x 145mm x 113mm | 
| Installation | DIN-Rail or Wall-Mount (optional kit) | 
| Reset Button | Yes | 
| Weight | 1000g | 
| Software | |
| Configuration | Atop Management Utility, Web UI, Telnet | 
| Supported Protocol | IPv4, ICMP, TCP, UDP, DHCP Client, SNMPv1,v2c,v3, HTTP, HTTPS, Telnet, RFC2217, Security through IPsec host-to-host or host-to-side VPN with up to 37.9Mbps VPN throughput  | 
| VirtualCOM | Windows/Linux redirection software | 
| Modbus Feature | |
| Supported Modes | Ethernet: Modbus TCP Server/Client(or VCOM); Serial: Modbus RTU/ASCII (master/slave)  | 
| Maximum number of clients/slaves | Modbus TCP: Maximum 16 clients; Maximum 32 slave connections  | 
| Link Mode | |
| TCP Client | Dual destination supports raw-data or VirtualCOM | 
| TCP Server | 4 Connections mode supports raw-data; VirtualCOM or reverse Telnet | 
| UDP | Up to 4 Ranges IP |