The DonTronics DT102 PCB has been designed on a 2.5" SimmStick platform, and is same size as the DT205 Relay board.
It has provision for six "Hat Key" type push button switches, and a standard 2 by 16 LCD. The board is designed for the Truly brand LCD, however many others will fit the standard 16 pin header strip provided. Mounting holes are provided for the Truly display which mounts via female/male header pins on the component side of the board, and above components such as the PIC16F84 micro. Yes, the micro will fit in a socket if need be, right under the display. The display is very simply removed.
Two RJ-45 connectors allow RS-485 communications via an 8 wire standard cables. Two jacks means RS-485 can be used on multiple connections or drops. These RJ-45 PCB mount jacks need to be mounted on the solder side of the board.
Also on the solder side of the board, you will find a spot to mount a 5 pin DIN PCB connector, same as the one in your standard PC. This allows an "AT" type keyboard to be plugged in as an alternative to the 6 push button switches.
Special notes regarding the circuitry used.
Configuration jumpers ( J4 ) use another multiplexing technique. Essentially when the PIC needs to read the configuration jumpers the i/o port is configured to be an input and the 'E' ( RA2 ) pin is configured to be an output with a logic low. The configuration information is then obtained by reading the appropriate input ports. The resistor pack bias resistors ( RP1 ) for the configuration jumpers are needed to prevent any interaction between the normal functions of the i/o lines and the configuration jumpers.
In 'normal' operation ( when not reading the configuration jumpers ) either the
PIC or the LCD would be driving the i/o lines. The bias resistors common line is connected
to the 'E' ( RA2 ) line to make sure that the correct
At the time of writing, software isn't available to make use of the "AT"
keyboard input, however code can be found at Steve Lawther's site at: http://ourworld.compuserve.com/homepages/steve_lawther/keybinfo.htm
This may need to be re-configured to suit the DT102 board. Code can also be found at
Mauricio Culibrk's site at: http://www.arne.si/~mauricio/PIC.HTM
Other Software will be available and full details will be announced in the near
LCD software specs.
Available as a preprogrammed PIC processor.
Functionally similar to Peter Andersons http://www.phanderson.com/PIC/ser_lcd_kit.html and/or Ben Wirz http://www.wirz.com/sli-oem/docs/sli-oem.pdf exceptions are the baud rate is limited to two different rates, only one type of display is supported ( should be able to cope with 16, 20 or 40*2 ).
Test software for the DT102 to operate with the DT102 firmware dt102test.zip ( 1.4M ). Download into a temporary directory, unzip the dt102test.zip file, then run the setup program.
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