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C M L - 1 2 C 3 2
J U L Y
2 6 ,
2 0 0 4
J2 - LCD EXPANSION
Header J2 allows the use of a 160-character LCD panel. Refer to LCD port section above for
details on the LCD PORT. To implement this option, modification wire from J2-2 to the LCD
panel must be installed. Also, the +5V and GND inputs on the LCD PORT connector must be
reversed. This is accomplished using CT6 and CT7. GND must be connected to LCD PORT-
2 and +5V must be connected to LCD PORT-1. Simply cut both cut-traces and use mod-wire
to route power as needed. To revert to a standard 40-character LCD panel simply remove the
installed mod-wire and 0-ohm, 1206 size, resistors across CT6 and CT7. A mod-wire jumper
across each cut-trace will also suffice. Refer to the PCB schematic and the OPTREX TM LCD
panel documentation for further details.
NC
1
2
EN1
EN1 – LCD enable input, 1 = LCD enable
TEST POINTS
The following test points are provided on the development board:
VDD1/VDD2: 2.5V digital logic voltage. Derived from the MCU internal voltage regulator.
XFC :
VDDPLL :
+5V:
GND:
RTS
CTS
RS
Vref1
MCU PLL reference voltage and filter
2.5V input to PLL
Regulated +5 voltage
Ground plane reference
COM1 flow control signal Ready To Send. TTL/CMOS logic level.
COM1 flow control signal Clear To Send. TTL/CMOS logic level.
Slew rate control for CAN Port
CAN Port reference voltage output
TROUBLESHOOTING
The CML-12C32 board is fully tested and operational before shipping. If it fails to function
properly, inspect the board for obvious physical damage first. Verify the communications setup
as described under GETTING STARTED and see the Tips and Suggestions section for more
information.
The most common problems are improperly configured communications parameters, and at-
tempting to use the wrong COM port.
1. Verify the power source. You should measure a minimum of 6 volts between the GND and
+VIN connections on the TB1 power connector.
2. If no voltage is present, verify the wall plug connections to 115VAC outlet and the power
17
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