Chapter 2
Configuration and Installation
©
National Instruments Corporation
2-3
SCXI-1102/B/C User Manual
Digital Configuration
If you have a one-chassis system, you do not have to read this section.
You can skip to the next section, Analog Configuration.
Note:
If nothing is cabled to the SCXI-1102/B/C module rear signal connector,
the position of jumper W1 is irrelevant.
The SCXI-1102/B/C modules have only one jumper—jumper W1—for
communication between the DAQ device and the SCXIbus, shown in
Table 2-1.
All SCXI modules have a jumper that corresponds to jumper W1 on the
SCXI-1102/B/C module. Refer to the user manuals of the other SCXI
modules in your system to determine the designator and settings of this
jumper. In the pullup position, this jumper connects a pullup resistor to
the SERDATOUT line. This pullup resistor pulls the SERDATOUT
line high when its open-collector driver goes to a high-impedance state.
The SERDATOUT line on the SCXI-1102/B/C module reads the
Module ID Register, the Status Register, and the EEPROM.
When using a single-chassis system, set the jumper in the pullup
position on the SCXI module cabled to the DAQ device. When using
multiple chassis, set the jumper to the pullup position on only one of the
SCXI modules cabled to the DAQ device.
Table 2-1.
Jumper Settings for Digital Signal Connection
Jumper
Description
Configuration
Position PULLUP—Use this
setting for a single-chassis system
and for one cabled module in a
multi-chassis system. Connects a
2.2 k
Ω
pullup resistor to the
SERDATOUT line. (factory
setting)
Position NO PULLUP—Use this
setting for additional chassis in a
multi-chassis system. No pullup
resistor is connected to the
SERDATOUT line.
W1
W1
PULLUP
NO PULLUP
W1
PULLUP
NO PULLUP
