RTSI Connector

The Real-Time System Integration (RTSI) connector allows connection to one or more NI DAQ devices. This allows I/O and trigger expansion beyond that normally available to the NI PCIe-1437. The RTSI bus should only be used with NI devices compatible with the RTSI bus.

Notice The RTSI connector is designed to work only with the NI products that have a RTSI connector. Each RTSI I/O is a bidirectional pin that is compatible with both 3.3 V (LVTTL/LVCMOS) and 5 V I/O (TTL/CMOS). No over-voltage protection, reverse voltage protection, or isolation is provided on this connector. Improper use of this connector will result in damage to the NI PCIe-1437. Use of a RTSI-compatible NI product is recommended.
Figure 6. RTSI Connector

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Table 6. NI PCIe-1437 RTSI Connector Pin Descriptions
Pin Number Description
1 to 18 No connection
19 Digital Ground
20 RTSI 0
21 Digital Ground
22 RTSI 1
23 Digital Ground
24 RTSI 2
25 Digital Ground
26 RTSI 3
27 Digital Ground
28 RTSI 4
29 Digital Ground
30 RTSI 5
31 Digital Ground
32 RTSI 6
33 Digital Ground
34 RTSI 7 / RTSI Clock