I’ve been playing with a lontech LCD driver: RS-232(2004) Driver
And I’ve attached it to a Hitachi 20x4 LCD: HD44780U (LCD-II) (Dot Matrix Liquid Crystal Display Controller/Driver)
Once again I’m a little confused as as to why I can’t get it this serial device working.
I decided to connect it to the USB->UART (RS232MAX) cable instead of my domino, so I don’t burn out my last two remaining serial ports. : These cables are cheaper than my Domino.
The Driver feature says: Communicate over RS232 interface
It has a MAX232 chip on it, see attached image.
LCD driver datasheet http://watchmelater.com/td/datasheets/RS-232_2004_.pdf
On page 6 of the datasheet it also says:
The RS-232 connector on the PC cable is wired so that a standard “straight through” 9 pin D-sub cable
may be used to connect the module to a standard serial port such as COM ports on PCs. Note that this device
complies with the EIA232 standard in that it uses signal levels from ± 12V to ± 12V and can be converted to
TTL levels as well. The LCDRS2 is set at 9600 bps default speed. Other settings are:
8 bits, no parity, 1 stop bit.
A standard DB-9F is provided for RS-232 communications. Power may also be supplied via this connector