I found an unknown LCD in the local elec. surplus store and have been challenged to make it work. It is a 2 x 16 display (5x7 block). It has a serial interface (no manufacture ID although a Bing search on an assy # on the board points to a url for "IndustrialElectricDirect" but the url registration has expired. There is an 8 pos screw terminal connector with the following lables:
1 2 3 4 5 6 7 8 + | - | - | RX | - | TX | + | -
There is a 7805 regulator on the board so I applied +9V to pins 7 and 8. This causes a underbar cursor to be displayed in pos 0 (row 1, col 1). I've found that pins 3, 5 and 8 are all common grounds. Pins 1 and 2 are isolated (pin 2 is not connected to pins 3, 5 or 8 ). Pin 1 is not connected to the +5V regulator output. I've connected pin 4 (RX) to my Arduino UNO pin 1 (tx) and pump an ascii letter 'A' to it and cycle thru baud rates from 1200 to 38400... but the cursor never moves nor does the letter 'A' appear.
Its a longshot that someone might recognize the LCD based on the 8-pin screw terminal connector configuration..??