BL4S100 User’s Manual
19
3.2 Digital I/O
3.2.1 Digital Inputs
The BL4S100 has 12 digital inputs, IN0–IN11, each of which is protected over a range of
–36 V to +36 V. The inputs are factory-configured to be pulled up to +5 V, but they can
also be pulled up to +K or pulled down to 0 V by changing a jumper as shown in Figure 6.
Figure 6. BL4S100 Digital Inputs IN0–IN11 [Pulled Up to +5 V—Factory Default]
Table 2 summarizes the jumper settings.
CAUTION:
Do not simultaneously jumper more than one setting when configuring
the pull-up or pull-down options.
Table 2. BL4S100 Digital Input Pull-Up/Pull-Down Jumper Settings
Pins Jumpered
Pulled Up/Pulled Down
1–2
Inputs pulled up to +K
2–4 or 4–6
Inputs pulled down to GND
5–6
Inputs pulled up to +5 V
100 k
W
27 k
W
+K +5 V
+3.3 V
IN0IN11
Rabbit® RIO
J13
