Quote:
Originally Posted by Al Skierkiewicz
It shows an external pullup is needed
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Al, can you reference the Page or Paragraph where it says an external pullup is needed? I didn't see any reference to external pullup.
Here's what I found:
According to the NI 9403 "c_series_do.pdf" document Page 1 Table 1:
the 9403 has 32 Sink/Source 5V/TTL inputs/outputs. Output is 5V @ 2 mA.
According to document "374069e.pdf" "OPERATING INSTRUCTIONS AND SPECIFICATIONS NI 9403 32-Channel, TTL Digital Input/Output Module", Page 7:
Each channel has a DIO pin to which you can connect a digital input or output device. The 32 DIO channels are internally referenced to COM, so you can use any of the four COM lines as a reference for the external signal. ... You can independently configure each DIO channel in software for input or output.
The Digital Sidecar (DS) connects to the NI 9403 module.
According to "3-2010FRCControlSystemComponent DatasheetsRev1_enc.pdf":
(Page 16 Para 3.4.1) Functional Description
The Digital Sidecar is a breakout module that is designed to adapt a single cRIO 9403 32-channel digital I/O module into a set of I/O that is familiar to robotics hobbyists.
(Page 16 Para 3.4.1.1) Features
The Digital Sidecar includes the following features:
- 14 general purpose I/O (aka GPIO) lines with available 5V power for each
(Page 18 Table)
J26 GPIO A 3x14 0.1” pin field for general purpose digital I/O with 5V available on the center pin, ground on the pin closest to the PCB’s edge and I/O signal on the pin furthest from the PCB’s edge.
(Page 19 Specifications)
GPIO – Pull-Ups 10 kOhms* these signals are passed directly to the NI 9403 module without any series resistance but include pull-ups to 5V
*I interpreted these as internal pullups since it says later in the sentence that they are included
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