Reference MVI56E-GSC/GSCXT ♦ CompactLogix or MicroLogix Platform
User Manual Enhanced Generic ASCII Serial Communication Module
Page 80 of 140 ProSoft Technology, Inc.
April 24, 2017
Read-Write Devices
Read-write devices are those that both send and receive data. An example of
this type of device is a computer terminal. A terminal will send data entered on
the keyboard out its serial port and display any data received on its port on the
monitor.
All data received from the terminal keyboard will be routed to the ControlLogix
processor through the MVI56E-GSC’s input image. Data to be written to the
terminal screen will be sent to the module using the output image. The module
will send new data from the output image out the application port to the terminal.
The example shipped with the module can be used to interface with a terminal to
echo back all characters received.
The data flow diagram for a read-write device is shown below:
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