Digi JACKRABBIT BL1800 User Manual download pdf (Page 67)

User’s Manual 63

The thermistor has a nominal room-temperature

resistance of about 10 kΩ, which drops to about

6kΩ at 40°C. Once you solder the thermistor onto

the RT1 pads (see Figure B-5) on the Prototyping

Board, the A/D converter readings on AD0 will

change with temperature.

If the 10 kΩ potentiometer is removed, the change

in A/D converter readings with temperature will be

larger.

The LEDs can be mounted in positions DS5–DS8,

shown in Figure B-6, to display the complete status

for Parallel Port A.

The serial cable included in the parts bag can be

used to connect the Jackrabbit’s RS-232 outputs

from header J1 on the Prototyping Board to an

available PC serial port.

Unlike the CMOS-level signals on header J3, the

programming port on the Jackrabbit board, the sig-

nals on header J1 on the Prototyping Board are full

RS-232 level signals without needing the CMOS to

RS-232 converter that is present in the program-

ming cable. The RS-232 level signals are processed

via the MAX232 transceiver chip, U4, on the Jack-

rabbit board to Serial Ports B and C of the Rabbit

2000. The CMOS-level signals on the program-

ming port are connected to Serial Port A.

Figure B-5. Thermistor and

Potentiometer Locations

Figure B-6. LED Location

Thermistor

10 kW

Potentiometer

Buzzer

JP2

LS1

DS1

RT1

BZR

VCC

AD0

PE4

POT

HV0

+RAW

COIL(-)

PD0

GND

AD0

}

Existing

LEDs

}

Add

Dev Kit

LEDs

S2 S1

DS1DS2DS3

S4 S3

DS9

DS4

DS5DS6DS7DS8

PWR

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 ... 83 84

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Digi JACKRABBIT BL1800 User Manual Page 67

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