Firewalls for Industrial Networks
(Existing Customers Only)
PortBloque S
Modbus Serial Firewall
     - Modbus deep packet inspection
     - Modbus RTU/ASCII
     - RS-485/422/232 interface
     - Adds Modbus security to an existing firewall

PortBloque E
Modbus Ethernet Firewall
     - Modbus deep packet inspection
     - Modbus Ethernet to Serial Conversion

            Modbus TCP/UDP
     - RS-232/422/485 interface

Serial Encryptor
This product has reached end of life (EOL). Support is for existing customers only.
Encryption for serial Modbus or DNP3

EncryptorPak provides data security for serial point-to-point and multi-drop links that use Modbus, DNP3, and other stream protocols. Easy installation with no change to existing network configuration.
Encryption features
  • Link layer Advanced Encryption Standard (AES)
  • Hash Authentication
  • Up to 200 secure links
  • Two levels of encryption keys

Flexible serial interface 
Mix or match any combination of RS-232, RS-422, or RS-485 (2- or 4-wire) interfaces via DB-9 or terminal block. 

Mixed mode for seamless operation 
Allows a mix of encrypted and clear traffic over a single link for segmentation or migration purposes. 

Secure login 
Login access for configuration can be restricted and secured by three different levels: Admin, Crypto User, and User.

Activity logs 
Detailed event logs for system activity. 

Technical Specs

  • Standard IEEE 1711-2010 (Cryptographic Protocol for Cyber Security of Serial Links) 
Cryptographic Suites 
  • Advanced Encryption Standard (AES) 128-bit 
  • MD5 128-bit hash (RFC 1321) 
  • SHA-1 160-bit hash (ANSI X9.30-2 and FIPS 180-1 
Secure Serial Links 
  • Up to 200 (simultaneous) 
Encryption Keys 
  • Two-level key management: Key Encrypting Key, Data Key 
  • Automated re-key of Data Key 
  • Multi-drop 
  • Point-to-Point (P2P) 
Serial-to-Serial Protocols 
  • DNP3 
  • Modbus RTU / ASCII 
  • Any byte-oriented protocol in P2P 
Ethernet-to-Serial Protocols 
  • Modbus TCP and UDP 
  • Modbus RTU/ASCII over TCP and UDP 
  • DNP3 over TCP 
  • Local/Remote: 10-pin terminal block 
  • Remote:DB9 male (RS-232/422/485 software selectable) 
  • Local: DB9 female (RS-232/422/485 software selectable) 
  • Mgmt DB9 female (RS-232) 
  • LAN: RJ45 Ethernet (10/100BaseT) 
Data Rate 
  • 300 to 115.2K bps (async)
Data Format 
  • 8N, 8E, 8O, 7E, 7O. One or two stop bits (async)
Web Interface 
  • Login secure levels: Admin, Crypto User, User 
LED Indicators 
  • Power, Ethernet Activity, Secure Link Activity 
  • 3.3VDC Power adapter 
  • Enclosure: 18 gauge steel 
  • Weight: 1 lb 
  • Size: 1 x 8 x 5 inches (2.54 x 20.32 x 12.7 cm) 
Operating Environment 
  • -40° C to 85° C (-40° F to 185° F) 
  • 2 Years