Using Jumpers W4 And W5; Jumper W6 - National Instruments SCXI-1163 User Manual

Configuration and Installation Chapter 2
Position PAR disconnects SERDATOUT from the SCXIbus MISO line. Use this position when
you will connect the module in parallel to a data acquisition board.

Using Jumpers W4 and W5

If a module is not connected to a data acquisition board, the positions of jumpers W4 and W5 are
irrelevant. Jumpers W4 and W5 give the data acquisition board access to the MISO line on the
backplane. You use the MISO line to read the Module ID Register of modules. National
Instruments software does not use this ability. You must indicate to the software which module
is in which slot. In addition to reading the Module ID Register, you can use the MISO line on
the SCXI-1163 to read the Status Registers, which indicate the primary and output modes of
operation. National Instruments software uses this feature.
The SERDATOUT line is driven with an open-collector driver, which is a driver that actively
drives low or goes to a high-impedance state, relying on a pullup resistor to make the signal line
go high. When using a single chassis, set jumper W4 to position A on the SCXI-1163 that is
connected to the data acquisition board and set jumper W5 to DIO or MIO. In this setting, the
module drives MISO to SERDATOUT and connects the necessary pullup resistor to the
SERDATOUT line. When using multiple chassis, set jumper W5 to position DIO or MIO on all
of the SCXI-1163s that are cabled to the data acquisition board. Only one of the SCXI-1163s
that are cabled to the data acquisition board should have jumper W4 in position A. It does not
matter which of the SCXI-1163s that are cabled to the data acquisition board has the pullup
connected. You should set jumper W4 to position B on all of the other SCXI-1163 modules that
are cabled to the data acquisition board. If you attach too many pullup resistors to the
SERDATOUT line, the drivers cannot drive the line low.

Jumper W6

Jumper W6 sets the primary mode of operation to either serial mode or parallel mode and
configures the rear connector accordingly. With the primary mode of operation set to parallel,
the rear connector is configured to accept parallel data from a DIO board. With the primary
mode of operation set to serial, the rear connector is configured to allow serial communication
between a data acquisition board and the SCXIbus.
To set the primary mode of operation to parallel, set jumper W6 to position P. In this mode,
jumper W5 should be set to PAR to prevent the MISO line from inadvertently driving one of the
outputs. To set the primary mode of operation to serial, set jumper W6 to position S.
SCXI-1163 User Manual 2-6 © National Instruments Corporation