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Serial lcd blue 4 line x 20 dsiplay module
Serial LCD Blue 4 line x 20 character Display
This is a 4 line by 20 display with a serial interface fitted. Shown is the back of the LCD and below is a description of how the controller works. NOTE that the display controller is ALREADY FITTED and no soldering is required.
The serial to LCD display converter that converts a standard LCD display (HD44780 or similar controller) to a serial display. Interfacing is very easy, the device is fully configurable and can be used for displays up to 4 lines with a total of 80 characters. Full data sheet can be found here http://www.asi.byvac.com/LightNEasy.php?page=da_data
This serial controller has a top mounting and a side mounting interface to cater for both types of display.
There is a trimmer potentiometer that provides contrast setting and a 20mA power output on pin 15 for the back light if one exists on the display. NOTE: For the 4 x 20 line display this trimmer has no effect, it is at full contrast all of the time.
Only three wires are required from the COM port to the device. There is no hardware handshaking so the pins in the above table should be connected together as indicated (1,6,4: 7 and 8). Connection to a non-inverted source would be similar except that pin 1 would be used instead of pin 4.
A non-inverted source would be the output form a microcontroller or the output form a USB/RS232 to TTL converter such as the BV101-4 . This device will plug directly into the BV101-4.
The following example is for a two line by sixteen display, the 4 line display works in exactly the same way except the command to send the cursor to the start of each line is:
As an example the device has been attached to a blue LCD display and connected directly to a BV101-4 and using the PC USB interface as shown in the picture:
Full details of all of the commands are given in the datasheet, link at the top of this page. The link also contains details of the ASI interface and protocol used for this device.
