6602 Synchronize 4 outputs by matlab

Hello,

I am trying to use PCI-6602 counters to generate 4 pulses that start together. The width of these 4 pulses are ms level. However, the delay between channels is ms level too. So how to synchronize trigger the start and stop of 4 channels (with different duty cycle) by matlab?  

I tried to use an external signal to trigger 4 channels together buy using 'addTriggerConnection', 'External' as source. But it didn't work. Matlab said Trigger and clock connections will not affect counter output channels.

And how to connect wires?

Thanks.