NI 6544/6545/6547/6548 Front Panels

The NI 6544/6545/6547/6548 front panel exposes the following connections:

  • Three SMA connectors named CLK IN, PFI 0, and CLK OUT
  • One 68-pin VHDCI connector named DIGITAL DATA & CONTROL, or DDC
Figure 3. NI 6544/6545/6547/6548 Front Panel with VHDCI Connector Pinout

1378

Table 1. NI 6544/6545/6547/6548 DDC Connector Pins
Pins Signal Name Signal Type Signal Description
33 DDC_CLK OUT Control Output terminal for the exported Sample Clock.
67 Strobe Control Terminal for the external Sample clock source, which can be used for dynamic acquisition.
1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65 DIO <0..31> Data Bidirectional digital I/O data channels 0 through 31.
26, 30, 64 Programmable Function Interface (PFI) <1..3> Control Input terminals to the device for external triggers, or output terminals from the device for events.
2, 4, 6, 10, 12, 14, 16, 18, 20, 22, 24, 28, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 54, 56, 58, 62, 66 GND Ground Ground reference for signals.
8, 52, 60 RESERVED N/A Terminals reserved for future use. Do not connect to these pins.
Table 2. NI 6544/6545/6547/6548 SMA Connectors
Connector Signal Name Signal Type Description
CLK IN Reference Clock Input Control Terminal for the external Reference clock used for the PLL or for the external Sample clock used for dynamic generation and/or acquisition.
PFI 0 PFI 0 Control Single-ended input terminals to the device for static I/O, for external triggers, or for output terminals from the device for events. Refer to the device specifications for signal voltage levels.
CLK OUT Reference Clock Output Control Terminal for the exported PLL Reference clock or the exported Sample clock.
Table 3. ACTIVE LED Indicators
Color Indications
Off Device not armed and not triggered.
Amber Device armed and awaiting Start Trigger. If performing a dynamic acquisition operation, the device may be acquiring pretrigger samples.
Green Device received Start Trigger.
Red Error condition.
Table 4. ACCESS LED Indicators
Color Indications
Off Device not ready.
Amber Device being accessed by software.
Green Device ready to be programmed
Red Running the niHSDIO Self Test VI or calling the niHSDIO_self_test function produced a failure.