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IOLAN STG Secure Terminal Servers (Serial to Ethernet Terminal Servers)

iolan stsd lg
  • 4 or 8 serial RS232 on RJ45 Ports
  • 10/100 or 10/100/1000 Ethernet
  • Small compact size
  • Wall, desk or DIN Rail mounting
  • Advanced security feature set

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Engineers and Project Managers that require a cost effective 4 or 8 port serial RS232-to-Ethernet solution that maintains serial device protocol integrity
across Ethernet must consider the IOLAN STG. Having the highest performance
processor available along with the Perle’s unique TrueSerialTM technology,
the IOLAN STG will provide the most authentic serial connections across
Ethernet. IOLAN STS4-D Serial Terminal Servers are also available with support for Power over Ethernet (PoE).

Ideal for

  • Engineers and Project Managers requiring a high performance serial
    to Ethernet interface for up to 4 or 8 serial RS232 based devices. Connect
    to serial based applications over Ethernet
  • Compact size offers the smallest 4 or 8 port serial to Ethernet solution on the market

Why IOLAN STG Terminal Servers are the preferred choice:

  • High performance processors for the best throughput
    available. Ideal for time sensitive applications
  • Compact size offers the smallest 4 port serial to Ethernet solution
    on the market
  • Next Generation IP support (IPv6) for investment protection and
    network compatibility
  • TrueSerial™ packet
    technology – the most authentic serial connections across Ethernet
    ensures serial protocol integrity
  • Primary/Backup host functionality enables automatic connections
    to alternate hosts should the primary TCP connection go down
  • EasyPort Web – Access equipment serial console ports by using
    your java-enabled Internet browser
  • TruePort – Perle’s com/tty redirector for serial based applications
    operates on Windows, Vista, Linux, Solaris, SCO and Unix
  • Clustering
    Provides a single view of all out of band console ports. Ideal
    for large data centers
  • FIPS 140-2 – Cryptographic modules meet US Government NIST compliancy
  • Dynamic DNS
    Easy console management access from anywhere on the Internet
  • Intelligent Power cycling of equipment with Perle Remote Power Switches
  • Java-free browser access to remote serial console ports via Telnet and SSH
  • Ping watchdog probes enable customers to power cycle equipment with attached Perle RPS power switches in the event of an unresponsive networking gear
  • Lifetime warranty – best investment protection available


Serial Port Access
Connect directly using Telnet / SSH by port and IP address
Connect with EasyPort menu by Telnet / SSH
Use an internet browser to access with HTTP or secure HTTPS via EasyPort Web menu
Java-free browser access to remote serial console ports via Telnet and SSH
Ports can be assigned a specific IP address ( aliasing )
Multisession capability enables multiple users to access ports simultaneously
Multihost access enables multiple hosts/servers to share serial ports
In-band ( Ethernet ) and out-of-band ( dial-up modem ) support
Dynamic DNS enables users to find a console server from anywhere on the Internet
Domain name control through DHCP option 81
IPV6 and IPV4 addressing support
Primary/Backup host functionality enables automatic connections to alternate host(s)
SSH v1 and v2
PCI DSS Compliance: TLS v1.2, TLS v1.1, TLS v1.0, SSL v3.0, SSL v2.0
SSL Server and SSL client mode capability
SSL Peer authentication
IPSec VPN : NAT Traversal, ESP authentication protocol
SSH ciphers: AES-CTR, AES-GCM and ChaCha20-poly1305
SSL encryption: AES-GCM, key exchange ECDH-ECDSA, HMAC SHA256, SHA384
Encryption: AES (256/192/128), 3DES, DES, Blowfish, CAST128, ARCFOUR(RC4), ARCTWO(RC2)
Hashing Algorithms: MD5, SHA-1, RIPEMD160, SHA1-96, and MD5-96
Key exchange: RSA, EDH-RSA, EDH-DSS, ADH
X.509 Certificate verification: RSA, DSA
Certificate authority (CA) list
Local database
RADIUS Authentication, Authorization and Accounting
TACACS+ Authentication, Authorization and Accounting
LDAP, NIS, Kerberos Authentication
RSA SecureID-agent or via RADIUS Authentication
SNMP v3 Authentication and Encryption support
IP Address filtering
Disable unused daemons
Active Directory via LDAP
Terminal Server
SSH v1 and v2
Auto session login
LPD, RCP printer
MOTD – Message of the day
Serial machine to Ethernet
Tunnel raw serial data across Ethernet – clear or encrypted
Raw serial data over TCP/IP
Raw serial data over UDP
Serial data control of packetized data
Share serial ports with multiple hosts/servers
Virtual modem simulates a modem connection – assign IP address by AT phone number
Virtual modem data can be sent over the Ethernet link with or without SSL encryption
TruePort com/tty redirector for serial based applications on Windows, Linux, Solaris, SCO, HP UX, NCR UNIX and AIX. For a complete list of all the latest drivers click here
TrueSerial packet technology provides the most authentic serial connections across Ethernet ensuring serial protocol integrity
RFC 2217 standard for transport of serial data and RS232 control signals
Customizable or fixed serial baud rates
Plug-ins allow customer or Perle provided plug-ins for special applications
Software Development Kit ( SDK ) available
Serial encapsulation of industrial protocols such as ModBus, DNP3 and IEC-870-5-101
ModBus TCP gateway enables serial Modbus ASCII/RTU device connection to ModBus TCP
Data logging will store serial data received when no active TCP session and forward to network peer once session re-established – 32K bytes circular per port
Console Management
Sun / Oracle Solaris Break Safe
Local port buffer viewing – 256K bytes per port
External port buffering via NFS, encrypted NFS and Syslog
Event notification
Manage AC power of external equipment using Perle RPS power management products
Clustering – central console server enables access ports across multiple console servers
Windows Server 2003/2008 EMS – SAC support GUI access to text-based Special Administrative Console
Ping watchdog probes enable customers to power cycle equipment with attached Perle RPS power switches in the event of an unresponsive networking gear
Remote Access
Dial, direct serial PPP, PAP/CHAP, SLIP
  HTTP tunneling enables firewall-safe access to remote serial devices across the internet
Automatic DNS Update Utilize DHCP Opt 81 to set IOLAN domain name for easy name management and with Dynamic DNS support , users on the Internet can access the device server by name without having to know its IP address. See Automatic DNS update support for details
IPSEC VPN client/servers Microsoft L2TP/IPSEC VPN client ( native to Windows XP)
Microsoft IPSEC VPN Client ( native to Windows Vista )
Cisco routers with IPSEC VPN feature set
Perle IOLAN SDS/STS and SCS models
OA&M ( Operations, Administration and Management )
SNMP V3 – read and write, Perle MIB
Perle Device Manager – Windows based utility for large scale deployments
Configurable default configuration
Installation Wizard
Set a Personalized Factory Default for your IOLANs

Hardware Specs

Hardware Specifications – IOLAN STG and STS-D

Processor 600 Mhz ARM processor MPC852T, 66 Mhz, 87 MIPS
RAM MB 512 32
Flash MB 4000 8
Interface Ports
Number of Serial Ports 4 or 8 4 or 8
Serial Port Interface RS232 DTE on RJ45 (10 pin)
Sun / Solaris Sun / Oracle ‘Solaris’ Safe – no “break signal” sent during power cycle causing costly server re-boots or downtime
Serial Port Speeds 300bps to 230Kbps with customizable baud rate support 50bps to 230Kbps with customizable baud rate support
Data Bits 5,6,7,8, 9-bit protocol support
Parity Odd, Even, Mark, Space, None
Flow Control Hardware, Software, Both, None
Serial Port Protection 15Kv Electrostatic Discharge Protection (ESD)
Local Console Port RS232 on RJ45 with DB9 adapter (provided)
Network Network Autosensing 1000Base-T / 100Base-TX / 10Base-T
10/100Base-TX Ethernet RJ45
Software selectable Ethernet speed 10/100/1000 Auto Software selectable Ethernet speed 10/100/Auto
Software selectable Half/Full/Auto duplex
Ethernet Isolation 1.5Kv Magnetic Isolation
Power Supply 120 V AC (USA), 230V AC (International) Wall Power Adaptor included
Power Supply Options Power via External power 9-30v DC,
4.8 Watts uses standard 5.5mm x 9.5mm x 2.1mm barrel socket,
Power IN over serial cable
Nominal Input Voltage 12v DC / 24v DC
Input Voltage Range 9-30v DC
Power IOLAN over Serial 4 Port: 9-30v DC
8 Port: N/A
4 Port: 9-30v DC
8 Port: N/A
Power External Device via Serial Port 4 Port: +5v DC regulated, 1W max
8 Port: N/A
4 Port: +5v DC regulated, 1W max
8 Port: N/A
Typical Power Consumption @ 12v DC ( Watts ) 4 Port: 2.0
8 Port: 2.7
4 Port: 2.4
8 Port: 3.0
LEDs Power/System Ready
Network Link activity
Serial: Transmit and Receive data per port
Environmental Specifications
Heat Output (BTU/HR) 4 Port: 16.38
8 Port: 9.20
4 Port: 8.20
8 Port: 10.20
MTBF ( Hours )

Calculation model based on MIL-HDBK-217-FN2 @ 30 °C

4 Port: 259,560
8 Port: 171,852
4 Port: 391,199
8 Port: 339,967
Operating Temperature 0C to 55C, 32F to 131F
Storage Temperature -40C to 85C, -40F to 185F
Humidity 5 to 95% (non condensing) for both storage and operation.
Case SECC Zinc plated sheet metal (1 mm)
Ingress Protection Rating IP30
Mounting Wall mount – bracket included
DIN Rail bracket optional
Product Dimensions
Weight 4 Port: 0.35 kg (0.77 lbs)
8 Port: 0.55 kg (1.2 lbs)
4 Port: 0.35 kg (0.77 lbs)
8 Port: 0.55 kg (1.2 lbs)
Dimensions 4 Port: 112 x 82 x 28 (mm), 4.4 x 3.2 x 1.1 (in)
8 Port: 112 x 156 x 28 (mm), 4.4 x 6.1 x 1.1 (in)
4 Port: 112 x 82 x 28 (mm), 4.4 x 3.2 x 1.1 (in)
8 Port: 112 x 156 x 28 (mm), 4.4 x 6.1 x 1.1 (in)
Shipping Weight 4 Port: .66 kg (1.46 lbs)
8 Port: 1.3 kg (2.9 lbs)
4 Port: .66 kg (1.46 lbs)
8 Port: 1.3 kg (2.9 lbs)
Shipping Dimensions 260 x 170 x 70 (mm), 10.2 x 6.7 x 2.8 (in)
Regulatory Approvals
Emissions CFR47 FCC Part 15 Subpart B:2015 CFR47:2003, Chapter 1, Part 15 Subpart B,(USA) Class A
ICES-003:2016 Issue 6:2016 ICES-003, Issue 4, February 2004 (Canada)
CISPR 32:2015/EN 55032:2015 (Class A)
EN55011 (CISPR11)
CISPR 16-2-3:2010/A2:2014  
EN61000-3-2:2014, Limited for Harmonic Current Emissions EN61000-3-2 : 2010, Limits for Harmonic Current Emissions
EN61000-3-3:2013, Limits of Voltage Fluctuations and Flicker EN61000-3-3 : 2010, Limits of Voltage Fluctuations and Flicker
Immunity CISPR 24:2010/EN 55024:2010
EN61000-4-2: 2009 Electrostatic Discharge
EN61000-4-3: 2006/A2:2010: RF Electromagnetic Field Modulated
EN61000-4-4: 2004 Fast Transients
EN61000-4-5: 2006 Surge
EN61000-4-6: 2009 RF Continuous Conducted
EN61000-4-8: Power-Frequency Magnetic Field
EN61000-4-11: Voltage Dips and Voltage Interruptions
Safety IEC 62368-1 and EN 62368-1:2014 IEC 60950-1 (ed 2); am1 am2 and EN 60950-1:2006 +A11:2009 +A1:2010 +A12:2011 +A2:2013
CAN/CSA-C22.2 No. 62368-1-14 and UL 62368-1 CAN/CSA-C22.2 No. 60950-1-03 and ANSI/UL 60950-1, Second Edition
Other Reach, RoHS and WEEE Compliant
Directive 2011/65/EU restriction of the use of certain hazardous substances in electrical and electronic equipment and meets the following standard:: EN 50581:2012
  4 Port: CCATS – G168387
8 Port: CCATS – G168389
ECCN – 5A992
HTSUS Number: 8471.80.1000
Perle Limited Lifetime Warranty

Serial Connector Pinout – 4-Port STS & STG



RJ45 Socket

IOLAN RJ45 Socket Function Direction
1 Power In larrow
2 DCD larrow
3 RTS right arrow
4 DSR larrow
5 TXD right arrow
6 RXD right arrow
7 GND line
8 CTS larrow
9 DTR right arrow
10 Power Out right arrow
Serial Connector Pinout – 8-Port STS & STG



RJ45 Socket

IOLAN RJ45 Socket Function Direction
1 DCD larrow
2 RTS right arrow
3 DSR larrow
4 TXD right arrow
5 RXD right arrow
6 GND line
7 CTS larrow
8 DTR right arrow
Perle adapters for use with straight thru CAT5 cabling

Application Diagrams


Using RAW TCP Sockets

A raw TCP socket connection which can be initiated from the serial-Ethernet device or from the remote host/server. This can either be on a point to point or shared basis where a serial device can be shared amongst multiple devices. TCP sessions can be initiated either from the TCP server application or from thePerle IOLAN serial-Ethernet adapter.


Using Raw UDP Sockets

For use with UDP based applications, Perle IOLANs can convert serial equipment data for transport across UDP packets either on a point to point basis or shared across multiple devices.

Console Server

Console Management

For access to remote console ports on routers, switches,etc, Perle IOLAN’s enable administrators secure access to these RS232 ports via inband Reverse Telnet / SSH or out of band with dial-up modems. Perle IOLAN models with integrated modems are available.

diagram console

Connect Serial-based Applications with a COM/TTY Port Driver

Serial ports can be connected to network servers or workstations running Perle’s TruePort software operating as a virtual COM port. Sessions can be initiated either from the Perle IOLAN or from TruePort.

diagram com tty

Serial Tunneling between two Serial Devices

Serial Tunneling enables you to establish a link across Ethernet to a serial port on another IOLAN. Both IOLAN serial ports must be configured for Serial Tunneling (typically one serial port is configured as a Tunnel Server and the other serial port as a Tunnel Client).

diagram tunneling
Virtual Modem

Virtual Modem

Enables the serial-Ethernet adapter to simulate a modem connection. When connected to the IOLAN and initiates a modem connection, the IOLAN starts up a TCP connection to another IOLAN serial-Ethernet adapter configured with a Virtual Modem serial port or to a host running a TCP application.

diagram modem

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