USB6501 trigger problem
Posted: Mon Jul 18, 2016 1:19 pm
Hi Coen,
We have just started using the National Instruments digital IO card (USB6501) to send trigger codes to Biosemi using Presentation. Have been through the faq section of this website and think our cabling and pin outs are good as well as the NI card configuration but are having problems with the trigger codes.
Essentially they look OK in the top row (1-8bits) of trigger section of the Biosemi acquisition window (ie a code 1 displays as a 1 and code 3 as a 3 etc). Although immediately under each code there always appears a zero (within the 1- 8 bit row) and not sure that occurred previously when using a parallel port?
The problem is that what ever codes are stored in the BDF file using the NI card they do not convert properly when using software such as SPM / fieldtrip. A code of 1 is now read as 128, 2 as 64 and 3 as 192.
Problem likely our NI card setup or maybe cabling but would appreciate any advice you might have to help us diagnose it.
Cheers
-Bill
We have just started using the National Instruments digital IO card (USB6501) to send trigger codes to Biosemi using Presentation. Have been through the faq section of this website and think our cabling and pin outs are good as well as the NI card configuration but are having problems with the trigger codes.
Essentially they look OK in the top row (1-8bits) of trigger section of the Biosemi acquisition window (ie a code 1 displays as a 1 and code 3 as a 3 etc). Although immediately under each code there always appears a zero (within the 1- 8 bit row) and not sure that occurred previously when using a parallel port?
The problem is that what ever codes are stored in the BDF file using the NI card they do not convert properly when using software such as SPM / fieldtrip. A code of 1 is now read as 128, 2 as 64 and 3 as 192.
Problem likely our NI card setup or maybe cabling but would appreciate any advice you might have to help us diagnose it.
Cheers
-Bill