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PCI-6534 SampleClk output

Hi,
I have the PCI-6534 card, a 68-pin cable and the SCB-68 connector box.
I have made a VI that generates data to a digital port (8-bit) and it uses the onboard clk (1 MHz). I would like to send the clk to a pin on the connector box, but now its getting tricky 🙂 The reference label for NI-653X devices has a PCLK1 and PCLK2 terminal, but the SCB-68 user manual says I should use PFI0 or PFI2. My VI generates an error saying I should use PFI4, RTSI0-RTSI6.
 
Can anyone please explain the logic?
 
Regards,
Mosgaard
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