Digi BL1800 user manual Digital Inputs/Outputs

3.2 Digital Inputs/Outputs

3.2.1 Digital Inputs

The Jackrabbit has six CMOS-level digital inputs, PB0–PB5, each of which is pulled up to +5 V as shown in Figure 5. The BL1820, which does not have RS-485, has one additional CMOS-level digital input, PC1.

Vcc

47 kW

Rabbit 2000™

Microprocessor

GND

Figure 5. Digital Inputs

The actual switching threshold is approximately 2.40 V. Anything below this value is a logic 0, and anything above is a logic 1.

NOTE: Since the voltage limits on the inputs to the Rabbit 2000 microprocessor are 0 to

5.5V DC, the end user must ensure that the voltage applied to any I/O pin is within these limits.

User’s Manual 17