EZL-200 User's Manual
10
3. Advanced Function of ezTCP
3.1. Serial Port Interface
ezTCP supports three types of the serial communication interface
mode: T2S, ATC, and COD. In T2S and COD modes, you can use
ezTCP by simply connecting the serial port without modifying existing
equipments' software. While in ATC mode, the existing equipments'
software needs modifying. For ATC mode, the AT emulation function is
supported and it allows you to use ezTCP for a standard modem.
Those who have experienced with modem operation will take
advantage of the full ezTCP functions without effort. EZL-200 supports
the three interface types on-board and you can select those functions
through telnet, AT emulation, console, or ezConfig. The typical
functions of each mode are listed below. The note at the end of each
paragraph describes the items you should change through ezConfig
when using the relevant mode.
3.1.1. T2S (TCP to Serial)
In this mode, ezTCP always wait for a connection request from an
external device without voluntarily connecting itself to an external
server or PC. In case an external host is connected to the specified
port of ezTCP, ezTCP will connect the serial port to the TCP port.
That is, it transmits data from the serial port to the TCP port and data
from the TCP port to the serial port. This mode allows you to use
ezTCP without modifying the existing equipment's software while using
COD mode. In T2S mode, care should be taken that all data from the
DTE to the serial port will be ignored until a connection from a certain
external PC to ezTCP is established.
* setup fields: [TIME OUT], [LOCAL PORT]
3.1.2. ATC (AT Command)
You can use ezTCP for a standard modem. The extended
commands supported by ezTCP allow you to designate the IP address
and the port number of a host on the Internet and connect it through
