VXi VT1529A/B 用户手册

1. Channels referenced by algorithms when they are defined are only 

placed in the channel list before INIT. The channel list cannot be 
changed after INIT. If an algorithm is re-defined (by swapping) after 
INIT and it references channels not already in the channel list, it will 
not be able to access the newly referenced channels. No error 
message will be generated. To make sure all required channels will be 
included in the channel list, define <alg_name> and re-define all 
algorithms that will replace <alg_name> by swapping them before 
INIT is sent. This insures that all channels referenced in these 
algorithms will be available after INIT.

2. The driver only calculates overall execution time for algorithms 

defined before INIT. This calculation is used to set the default output 
delay (same as executing ALG:OUTP:DELAY AUTO). If an 
algorithm is swapped after INIT that take longer to execute than the 
original, the output delay will behave as if set by ALG:OUTP:DEL  0, 
rather than AUTO (see ALG:OUTP:DEL command). Use the same 
procedure from note 1 to make sure the longest algorithm execution 
time is used to set ALG:OUTP:DEL AUTO before INIT.

An example program file named "swap.cpp" on the drivers CD shows how 
to swap algorithms while the module is running. See Appendix G page 491 
for program listings. View the readme.txt file provided with the 
VXIplug&play driver for example program file location.