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© National Instruments Corporation
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NI 6509 User Guide and Specifications
Digital I/O Connections
The 100-pin high-density SCSI connector on the NI 6509 provides access 
to 96 digital inputs and outputs. Use this connector to connect to external 
devices, such as solid-state relays (SSRs) and LEDs. For easy connection 
to the digital I/O connector, use the National Instruments SH100-100-F 
shielded digital I/O cable with the SCB-100 connector block, or use the 
R1005050 ribbon cable with the CB-50 or CB-50LP connector block.
Caution
Do not make connections to the digital I/O that exceed the maximum I/O 
specifications. Doing so may permanently damage the NI 6509 device and the computer. 
Refer to the 
 and 
 sections for information about 
maximum input ratings.
Pin Assignments
SH100-100-F Connector
Figure shows the 100-pin SCSI connector on the NI 6509 device. 
The naming convention for each pin is PX.Y, where X is the port (P) 
number, and Y is the line number.