I am using PXIe 8820 controller. In MAX i want to configure VISA to route the front panel trigger to the backpanel trig lines (TTL0...TTL7 ect).Every time i am mapping in VISA erro occurs as "VISA: (Hex 0xBFFF00A0) The value specified by the line parameter is invalid" How can i map the trigger(front panel) to backpanel.