sparu13

Hello, NI PCIe-8430/8 support independent serial communication on each of its 8 ports, which means it can perform simultaneous communication, and here the problem I encountered. Can you help me to figure out why I cannot perform simultaneous communication? My code can perform simultaneous communication using onboard RS232. Below is the screenshot Note: I only use one sub vi and set the VI property execution reentrancy to pre allocated clone reentrancy execution, each clone sub VI have difference port setting. What other parameter need to set so the NI card will work simultaneous?