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12
ESP-4 MI Serial Hub Installer/User Guide
You may configure port connection methods using any of the following tools.
• Web interface - see Displaying or Changing Serial Port Interface, Attributes and
Connection Methods on page 27
• Configuration utility - see Displaying or Changing Port Interface, Attributes and
Connection Methods on page 38
• Configuration file - see Port Connection Method Commands on page 47
Serial port redirection
The serial port redirection connection method uses an ESP serial redirection driver on a host
computer to communicate with the hub. The driver creates a virtual COMM or TTY port interface
within the host’s operating system.
Table 3.1 describes this method’s configurable items for each serial port.
To use the serial port redirection connection method, you must install drivers on the host computer.
See the Release Notes on the SuperSerial CD for information. You may also use the ESP-Install
program; see
ESP-Install Program on page 58.
Telnet server
The Telnet server connection method allows a user to make a Telnet connection to a serial port on
the ESP-4 MI hub and then transmit/receive data using the standard Telnet protocol. This method is
also known as reverse Telnet.
When this method is enabled, the Telnet server within the hub will accept a connection from any
valid remote IP address. There is no filtering of remote addresses. The connection will be accepted
only if the port is not already open and in use by any connection method, including an existing
Telnet session on that port. If the port is currently in use, the connection request will be rejected.
The Telnet session will remain established until the remote client ends the session, the Telnet TCP
socket is broken or the inactivity time-out (if enabled) occurs.
Table 3.1: Serial Port Redirection Configurable Items
Item Description
Enable/
disable
Enables or disables the serial port redirection connection method on the serial port. The
default value is enabled. This method cannot be enabled if the raw TCP client connection
method is already enabled for the port.
Serial
buffering
Specifies the length of time accumulated serial data should be buffered before being sent to
the remote server. Valid values are 0-65535 hundredths of a second. A 0 value indicates that
data will be sent as soon as it is available.
For example, a value of 100 indicates that once serial data is received, it will remain buffered
up to 1 second (100 hundredths of a second), at which time all data will be sent.
If the buffer becomes half full, the time is ignored and the data is sent.
The default value is 0 (send immediately).