1. High Voltage Inputs to the RTSI Bus on NI 6528
The NI 6528 uses the National Instruments Real-Time System Integration (RTSI) bus interface to route additional timing and trigger signals between the NI 6528 and National Instruments RTSI-compatible devices. Use the National Instruments RTSI cable to connect the PCI-6528 to other RTSI-compatible devices.
The NI 6528 uses pins on the RTSI connector to connect the RTSI bus to the PCI/PXI trigger bus, as defined in the PCI Local Bus Specification, Revision 2.2 and the PXI Hardware Specification, Revision 2.1. All National Instruments PCI/PXI devices that have a connection to these pins can be connected through software. This feature is not supported by CompactPCI.
2. Watchdog Timers and RTSI on NI 6528
Using the watchdog timer and RTSI, you can chain multiple NI 6528 devices and configure them to expire simultaneously while updating only one timer.
You can program the NI 6528 to send a 200 ns logic high pulse to any or all RTSI lines when the watchdog timer expires. Additionally, you can program the watchdog timer to expire when it detects either a rising or a falling edge on a single RTSI line.