Chapter 2
Configuration and Installation
© National Instruments Corporation
2-3
SCXI-1124 User Manual
Supplementary Jumper Configuration Information
Jumper W1, when set to position P, connects a 2.2 k
Ω
pullup resistor to the SERDATOUT line.
An open-collector driver drives the SERDATOUT line. An open-collector driver actively drives
low or goes to a high-impedance state, relying on a pullup resistor to make the signal line go
high. If too many pullup resistors are attached to the SERDATOUT line, the drivers cannot
drive the line low. To prevent this, you set jumper W1 to position P on only one of the
SCXI-1124s that are cabled to the DAQ board in a multiple-chassis system. It does not matter
which of the SCXI-1124s that are cabled to the DAQ board has the pullup connected.
You can connect two types of DAQ boards to the SCXI-1124–DIO-type boards and MIO-type
boards. Jumpers W2, W3, W4 have labels indicating the DIO and the MIO configurations
(D and M are printed on the module). DIO-type boards are National Instruments boards that
have only digital inputs and outputs. These boards include the DIO-24, DIO-32F, and DIO-96.
MIO-type boards are National Instruments boards that have analog inputs in addition to digital
inputs and outputs. These boards include MIO boards; Lab boards; the PC-LPM-16; and the
DAQCard-700.
If you want to connect the SCXI-1124 to an MIO-type board, place jumpers W2, W3, W4 in the
M position. If you are using the SCXI-1124 and MIO-type board as well as modules with analog
inputs, you should cable the MIO-type board to one of the analog input modules. The
SCXI-1124 cannot send analog signals back to the MIO-type board.
Hardware Installation
You can install the SCXI-1124 in any available SCXI chassis slot. After you have made any
necessary changes and have verified and recorded the jumper settings on the form in
Appendix B, Customer Communication, you are ready to install the SCXI-1124. The following
are general installation instructions; consult the user manual or technical reference manual of
your SCXI chassis for specific instructions and warnings.
1. Turn off the computer that contains the DAQ board or disconnect the DAQ board from your
SCXI chassis.
2. Turn off the SCXI chassis. Do not insert the SCXI-1124 into a chassis that is turned on.
3. Insert the SCXI-1124 into the module guides. Gently guide the module into the back of the
slot until the connectors make good contact. If you have already installed a cable assembly
in the rear of the chassis, you must firmly engage the module and cable assembly; however,
do not force the module into place.
4. Screw the front mounting panel of the SCXI-1124 to the top and bottom threaded strips of
your SCXI chassis.
5. If you are connecting this module to an MIO-16 or a DIO-24 DAQ board, attach the
connector at the metal end of the SCXI-1340 cable assembly to the rear signal connector on
the SCXI-1124 module. Screw the rear panel to the rear threaded strip. Attach the loose end
of the cable to the DAQ board.
