National Instruments CB-27 User manual

DAQCard ™ is a trademark of National Instruments Corporation. Product and company names are trademarks or trade names of their respective
companies.
320933B-01 © Copyright 1995, 1998 National Instruments Corp. All rights reserved. October 1998
INSTALLATION GUIDE
CB-27 CONNECTOR BLOCK
This installation guide describes how to connect the CB-27 connector
block.
With the CB-27 connector block, you can easily connect analog and digital
signals to the National Instruments 27-pin PCMCIA DAQ products and the
NI 4350 (PCMCIA).
The CB-27 consists of a connector block with 28 screw terminals and a
30-position right angle connector with ejector ears. Each screw terminal
corresponds to a pin number on the 30-position connector. Refer to your
DAQCard user manual for connector pinout information.
What You Need to Get Started
To set up and use your CB-27, you will need the following components:
❑CB-27 connector block
❑CB-27 Connector Block Installation Guide
❑PR27-30F I/O cable or PSH 32-30F cable (for the NI 4350 (PCMCIA))
❑CB-27 quick-reference label
❑Your DAQCard or NI 4350 (PCMCIA)
❑Your computer
❑Screwdrivers
– No. 2 Phillips-head
– 1/8 in. flathead
❑Tie wraps

CB-27 Connector Block Installation Guide 2 © National Instruments Corporation
Installation
To connect the CB-27 to your DAQCard, perform the following steps:
1. Insert the DAQCard into the PCMCIA slot of your computer.
2. Plug the PR27-30F into the 27-pin connector on the DAQCard or the
PSH32-30F cable into the 32-pin connector on the NI 4350
(PCMCIA).
Caution Notice that the PR27-30F and PSH32-30F cables are keyed so that you can insert
them only one way. Do not put strain on the I/O cable when inserting it into and
removing it from the DAQCard and the CB-27 connector block.
3. Connect your signals to the CB-27 connector block. (Refer to Signal
Connections below for instructions.)
4. Insert the other end of the PR27-30F or PSH32-30F cable into the
CB-27connector.Thecableconnector iskeyedwith acentered tabthat
you must align with the slot on the CB-27 mating header. Firmly push
in the cable connector until the ejector ears on the CB-27 connector
snap into position.
Note Make sure that the PR27-30F ribbon cable or the PSH32-30F cable is not twisted
between the DAQCard and the CB-27.
Figure 1 shows an example of a typical configuration.
!

© National Instruments Corporation 3 CB-27 Connector Block Installation Guide
Figure 1. A Typical Configuration
Signal Connection
Note A blank quick-reference label that shows the screw terminals for DAQCards is
shipped with your CB-27. You can fill in the blanks with the signal information
from your DAQCard user manual and put the label on the inside of the CB-27
cover for easy reference. (Your DAQCard kit also contains a completed
quick-reference label.)
To connect the signals to the connector block, refer to Figure 2 as you
perform the following steps:
1. Make sure that the PR27-30F or PSH32-30F cable is disconnected
from the CB-27. (Refer to Cable Removal below for instructions.)
2. Remove the screws from the bottom of the CB-27 to remove the top
cover and the front panel.
PCMCIA Socket
Portable
Computer
PR27-30F or
PSH32-30F
I/O Cable CB-27
I/O Signals
CB-27

CB-27 Connector Block Installation Guide 4 © National Instruments Corporation
3. Connect the wires to the screw terminals by stripping off 1/4 in. of the
wire insulation and inserting the wires (26–18 AWG) into the screw
terminals. Tighten the screws.
4. After you connect the wires to the screw terminals, attach the wires to
the CB-27. Bunch the wires from one side of the connector block and
tie them to a strain-relief tab using a tie wrap (see Figure 2b). Repeat
for the other side of the connector block.
5. Replace the front panel andthe top cover and reinsert thescrews. Make
sure all the wires come out of the front panel openings.
Figure 2. Connecting Signals to the CB-27
You now can connect the connector block to the PR27-30F or PSH32-30F
cable.
Front Panel
Ejector Ears
Strain-Relief Tabs Tie Wrap
Signal Wires
Screw Terminals
30-Position Connector
Top Cover
a. Components b. Using the Strain-Relief Tabs

© National Instruments Corporation 5 CB-27 Connector Block Installation Guide
Cable Removal
To remove the PR27-30F or PSH32-30F I/O cable, perform the following
steps:
1. Grasp the cable connector near the DAQCard and pull it straight out.
(If you pull the cable out using a rocking motion or pull directly on the
cable, you may damage the pins on the cable or on the DAQCard.)
Remember to push on the latching ears of the PSH32-30F cable before
disconnecting it from the NI 4350 (PCMCIA).
2. Press outward on the ejector ears of the CB-27 connector. The cable
connector will pop out.