Chapter 3 Configuring Your SCXI Hardware and Software
© National Instruments Corporation 3-49 Getting Started with SCXI
Jumper W4, when set to position A, connects a 2.2 kΩ pullup resistor to the
SERDATOUT line. An open-collector driver drives the SERDATOUT line.
An open-collector driver either 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, set jumper W4 to
position A on only one of the SCXI-1163R modules that are connected to
the DAQ device in a multichassis system. It does not matter which of the
SCXI-1163R modules cabled to the DAQ device has the pullup connected.
Table 3-37.
SCXI-1163R Chassis and Mode Jumper Configuration
Jumper Description Configuration
A—Use this setting for a single-chassis system
(factory-default position).
B—Use this setting for an additional chassis in
a multichassis system.
S—Sets communication mode to serial
(factory-default position).
P—Sets communication mode to parallel.
W4
B
A
B
A
W6
S
P
S
P
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