Moxa Technologies MiiNePort E2-H User Manual page 86

MiiNePort E2/E3
Communication Model
In traditional serial communication models, communication is accomplished by connecting two devices over a
single serial channel. At the embedded device server end, Operating Mode (OP Mode) enables the other end of
the serial channel to transmit or receive data from the network. However, only one application, TCP Server
transportation, TCP Client transportation, or UDP transportation is supported at a time. The communication
model is depicted in the figure below.
NOTE Refer to Chapter 3: Choosing the Proper Operation Mode for an introduction to the operation modes
supported by the MiiNePort E2.
Although there are UARTs and even an OS and driver stacks between the TCP Server Application and Controller
Application, the applications are considered to be connected by a logical bidirectional channel indicated in red
in the following figure:
TCP Communication
When using MCSC, an MCSC "command encoding and decoding software module" is attached to each end of the
serial communication line. The software module, which is used primarily for UART applications, compresses the
data transmitted by the application through the single physical serial channel and dispatches the data received
from the physical serial channel to the appropriate applications. With the help of the MCSC modules, the two
applications at opposite ends are still connected to a logical bidirectional channel, but two or more application
pairs can also be connected by separate channels to the same physical serial channel. The communication
model is depicted in the following figure:
TCP Server
Application
UART
Serial Communication
8-5
Controller
Application
UART
NetEZ Technologies