Using The Internal Real-Time Clock; Using The Smb Connector For Digital I/O (Crio-9074 Only) - National Instruments CompactRIO cRIO-9072 User Manual And Specifications

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Using the Internal Real-Time Clock

The system clock of the cRIO-9072/9073/9074 is synchronized with the internal high-
precision real-time clock at startup. This synchronization provides timestamp data to the
controller. You can also use the internal real-time clock to correct drift of the system clock.
Refer to the Internal Real-Time Clock Specifications
real-time clock.
Using the SMB Connector for Digital I/O
(cRIO-9074 only)
You can use the SMB connector of the cRIO-9072/9073/9074 to connect digital devices to the
controller. For example, if you connect the pulse-per-second output of a GPS device to the
SMB connector of the cRIO-9072/9073/9074, you can use the GPS device to correct for drift
of the system clock.
For software that supports GPS drift-correction and other digital I/O through the SMB
connector, go to ni.com/info
Figure 12. Controller Serial Port
Pin 6
Pin 9
Table 2. DB-9 Pin Descriptions
Pin
and enter the Info Code
NI cRIO-9072/9073/9074 User Manual and Specifications | © National Instruments | 13
Pin 1
Pin 5
DCD
RXD
TXD
DTR
GND
DSR
RTS
CTS
RI
for the accuracy specifications of the
.
criosmb
Signal