Protect Modbus Slave Devices from Internet Attacks

PortBloque E
("port block")

PortBloque E is a specialized firewall that protects serial Modbus devices from Internet attacks. It combines firewall operation and Modbus TCP/UDP deep packet inspection (DPI) to block everything that's unwanted or harmful. The simple web interface makes setup easy. Operators can control Modbus traffic by slave IDs and function codes, and block a command that repeats too soon, e.g., to prevent a servo attack (rpm). Additionally, operators can define a permissible range of slave registers and values to prevent malicious memory access. The integrated Modbus IP-serial converter offers the flexibility and convenience of Internet enabling serial devices.

• DPI on Modbus TCP/UDP
• Access control list
• Stealth mode to hide network
• Highly customizable
• Modbus IP-serial conversion
• 1 RJ-45 Ethernet (Web)
• 1 DB9 serial slave (RS-232)
• 1 DB9 serial console (RS-232)
• Small size approx: 4 x 3 x 1 in
• 0 to 85°C (32 to 185°F)
• Durable metal housing
• Ships with external 5VDC (2A) power supply

Download the Datasheet

PortBloque E
Ethernet Firewall with DPI on Modbus TCP/UDP

$495.00 USD
Made in California

FREE technical support

BUY NOW

EXPLORE OTHER PRODUCTS
Protection against serial attacks

Packed with Modbus security features.

Blocks function codes, registers, and values that you have not permitted to specific slave devices.

Blocks a command that repeats too soon to protect slave devices.

Blocks IP packets that are not expected (per origin, destination, protocol, and port).

Ignores scans/probes from intruders to make the Modbus network virtually invisible to hackers.

Device ID

Function Code

Register

Value

Detailed control of Modbus.

You can select the types of function codes that specific slaves can receive and define accessible read/write ranges for registers and values.

Intuitive.

The simple web interface provides detailed control over Modbus traffic.

Take a look at how easy it is.

Enter the Modbus device IDs of serial slaves you want to protect.

Select the Modbus function codes you want those devices to receive.

You can also enter Modbus register and value ranges.

And enter the amount of time to wait before a particular Modbus command can be repeated to prevent malicious attacks, e.g., a servo attack (rpm).

You can also enter non-standard Modbus function codes that are in use by your plant. Examples of customer-entered numerical codes and names are shown below.

Direct connect to Modbus slaves.

Built-in Modbus IP-serial converter

Ethernet: Modbus TCP/UDP

Ethernet: Modbus RTU over TCP/UDP

Ethernet: Modbus ASCII over TCP/UDP

Serial: Modbus RTU

Serial: Modbus ASCII

Ports

1 RJ-45 Ethernet
1 DB9 serial slave (RS-232)

Buy Now

The safe, fast, and secure way to pay online using any major credit card. You don't need a PayPal account.

PortBloque E
$495.00 USD
Typically ships in 5 days via UPS Ground

► Can’t purchase right now? Simply use the Order Request form and we’ll send a PayPal invoice to your email.

► International Shipping: Please use the Order Request form.

► Shipping outside the 48 contiguous United States: Please use the Order Request form.

▼ Shipping within the 48 contiguous United States: Please select a quantity (up to 5) from the dropdown and click on the 'Buy Now' button. To order a quantity greater than 5, please use the Order Request form.