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INC jumpers
The INC jumpers can be used when an external power supply is not desired to power the digital
inputs. When INC jumpers are installed, example shown in Figure 4.15, the Input Common pins are
internally connected to the RIO +5V reference signal. Each RIO model has a slightly different labeling
scheme for these jumpers, so use Table 4.3 as a reference for the INC Jumper Labels for your model.
In addition to installing the INC jumpers, the digital inputs must have a reference ground. This
reference comes from the Input Reference Ground pins as shown in Table 4.3.
INC Jumper Labels
2
No Connect
3
(+5V internal reference)
Input Reference Ground
RIO-471xx
Bank 0, DI[7:0]
INC
INC0
INC0B
1
Bank 1, DI[15:8]
INC
INC1
INC1B
1
RIO-472xx
Bank 0, DI[7:0]
INC
INC0A
INC0B
Bank 1, DI[15:8]
INC
INC1A
INC1B
RIO-47300
Bank 0, DI[7:0]
INC0A, INC0B
INC0A
INC0B
Bank 1, DI[15:8]
INC1A, INC1B
INC1A
INC1B
Bank 2, DI[23:16]
INC2A, INC2B
INC2A
INC2B
Table 4.3: Listing of INC Jumpers and Input Reference Ground by model
1
Labeled “N/C” see RIO-471xx - 44 pin D-Sub Connector for correct pin-outs.
2
Location of the jumpers are in the Appendix listed under Jumper Descriptions.
3
Usually this can remain a No Connect. Alternatively, these pins can be used as a +5V internal reference that can only
supply 10mA total. Note: if any noise is introduced on this pin, it can have a deleterious effect on the analog signals.
WARNING
Do not connect any power to the Input Common pins when INC jumpers are installed,
damage will occur to the unit.
Figure 4.16, Figure 4.17, and Figure 4.18 shows (for the RIO-47100, -47200, and -47300 respectively)
how the INC jumpers effect the internal wiring as well as how to externally wire inputs when these
jumpers are in use.
Chapter 4 I/O ▫ 49 RIO-47xxx Rev 1.0r
Figure 4.15: INC Jumpers installed on a RIO-47100