Obviously, RS232 and I2C liquid crystal display drivers provide easy operation of standard 20x4 or 16x2 LCD text displays. Usually such a serial LCD module demands only a 5V power supply and just two data connections, thus freeing up I/O pins on your microprocessor.
Character type LCD module with RS232 interface would be another perfect display solution for industrial control and PC's auxiliary display applications.
Lumex Inc. currently offers three types of character LCD modules with RS232 interface. Their 20x2 characters LCD module with white LED backlight is shown above.
The Lumex RS232 LCD module uses UART and AT command as protocol to communicate with various devices. Also, users can use the same firmware when there is need to switch from character type display to graphic type display or the other way around.
Usually the Serial mode (RS232) operates over a link with a baud rate of 9600 bps and 5V signals. However, do not connect RS232 directly to a generic RS232 LCD module as you will destroy it in most cases. Note that often you need to use a MAX232 (or equivalent) IC to convert the RS232 levels to 5V (TTL).
Here you will find the technical documentation for LCD05 I2C/Serial LCD https://www.robot-electronics.co.uk/htm/Lcd05tech.htm
Next is the system block diagram of the CFA632 customizable LCD Modules (Crystalfontz America, Inc.).
Note that you can use any of six interfaces on any of the LCD modules in the series by simply changing the interface selection in a command and using the appropriate jumper configurations.
Now download and read the PDF Datasheet below to understand more about CFA632 series smart LCD modules ↓
OK, see you next week!
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