© National Instruments | 2-9
M Series User Manual
37-Pin Cables
In most applications, you can use the following cables:
• SH37F-37M—(Recommended) 37-pin female-to-male shielded I/O cable,
(1 m and 2 m lengths)
• SH37F-P-4—37-pin female-to-pigtails shielded I/O cable
• R37F-37M—37-pin female-to-male ribbon I/O cable
37-Pin Screw Terminal Accessories
National Instruments offers several styles of screw terminal connector blocks. Use your 37-pin
cable to connect a PCI-6221 (37-pin) device to one of the following connector blocks:
• CB-37F-HVD—37-pin DIN rail screw terminal block
• CB-37FV—Vertical DIN rail-mountable terminal block with 37 screw terminals
• CB-37FH—Horizontal DIN rail-mountable connector block with 37 screw terminals
• CB-37F-LP—Low profile connector block with 37 screw terminals
RTSI Cables
Use RTSI bus cables to connect timing and synchronization signals among PCI/PCI Express
devices, such as X Series, E Series, CAN, and other measurement, vision, and motion devices.
Since PXI devices use PXI backplane signals for timing and synchronization, no cables are
required.
37-Pin Custom Cabling
NI offers cables and accessories for many applications. However, if you want to develop your
own cable, the following kits can assist you:
• TB-37F-37SC—37-pin solder cup terminals, shell with strain relief
• TB-37F-37CP—37-pin crimp & poke terminals, shell with strain relief
Adhere to the following guidelines for best results:
• For AI signals, use shielded, twisted-pair wires for each AI pair of differential inputs.
Connect the shield for each signal pair to the ground reference at the source.
• Route the analog lines separately from the digital lines.
• When using a cable shield, use separate shields for the analog and digital sections of the
cable. Failure to do so results in noise coupling into the analog signals from transient digital
signals.
For more information on the connectors used for DAQ devices, refer to the NI DAQ Device
Custom Cables, Replacement Connectors, and Screws document by going to
ni.com/info
and entering the Info Code
rdspmb.
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