Manual PCI-IDO-48A Series
6
This board is also able to detect and count buffer underrun errors when using the External
Trigger mode. A buffer underrun error occurs when a rising edge of the External Trigger
happens before the outputs are written. Conversely, buffer overflow occurs when outputs are
written more than once without an External Trigger rising edge. To prevent buffer overflow, a
software readable bit can be polled to tell if a rising edge of the External Trigger has
happened.
Refer to Chapter 5: Programming for details regarding the functions mentioned above.
Output connections are via three 50-pin IDC connectors, labeled Port0, Port1, and Port2 in
this manual. Each Port contains sixteen outputs and Port0 also contains The External Trigger
input.
Outputs are broken out using 50-wire ribbon cables that mate with the IDC connectors on the
card. A strain relief bar where the cables exit the card assures that the cables will not interfere
with adjacent cards. Standard cables are six feet long but alternate lengths are available.
Figure 1-1:
Block Diagram
