PXI-6509 loopback

[mannyb]

Taylor G , no bent pins. I had my custom cabling re-worked completely (pulled out all pins and replaced wiring) and it seems to be working fine,  the pulldown 1k resistor worked. The loopback is working as expected. Thanks to everyone for your help.

[MFreire]

mannyb,

I am working now to test PXI-6509 Module using a custom cabling and a loopback as you had done, but it is not working properly.

There is a interference that even without the connection of loopback some lines are in the state high (ON).

I am using a AMP Connector 100 - pin SCSI (PN 749111-8) and a flat cable (as used for parallel cable - printer).

Which cable and connector are you using ?

Thank you !

[crossrulz]

First of all, this thread is over a year old.  Secondly, it sounds like you have some lines open.  The 6509 has built-in "weak" pull up resistors.  So if left open, the line will read high.

[MFreire]

Dear crossrulz, thank you !

I agree with you that all lines are open, but the problem is that initially all lines are on low level and when I apply high level just for P0.0 the others lines of P0 also get high level.

I am testing now installing a pull down resistor (1K) on all inputs and it seems that the loopback is working now.