Serial Hubs (more commonly referred to as Terminal Servers or Device Servers) are hardware devices which convert serial asynchronous data from an RS232, RS422 or RS485 port to TCP/IP or UDP packets. These converters or adapters are typically found in 1 port or multiport models and include a 10/100 Ethernet network interface.
What to consider when choosing a Serial Hub
Serial async start/stop characters in 7, 8 or 9 bit formats are received by the Serial Hub and then encapsulated in TCP or UDP packets. These packets are then forwarded to a remote software based IP socket application, another serial device connected to a peer Serial Hub on the network or to a virtual COM port redirector software utility like Perle’s TruePort.
In order to ensure that the original serial data stream is received by the other end point, it is important that these Serial Hubs have sufficient processing power to handle high throughput serial data. They must also have the ability to properly packetize the data onto TCP/IP packets.
Perle’s IOLAN Terminal Server and Device Server family with TrueSerial technology greatly exceeds the performance of all other similar Serial-IP converters on the market and provides the most authentic serial connection across a TCP/IP Ethernet network. A wide selection of models are available to match your specific application requirements. Described below are just some of the possibilities.
Using RAW TCP Sockets
A raw TCP socket connection which can be initiated from the Serial Hub 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 the Perle IOLAN Serial to Ethernet Hub.
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.
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.
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.
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).
Enables the RS485-Ethernet converter 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 converter configured with a Virtual Modem serial port or to a host running a TCP application.