National Instruments SC-2043-SG Barcode Reader User Manual


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Theory of Operation Chapter 4
SC-2043-SG User Manual 4-2 © National Instruments Corporation
The block diagram in Figure 4-1 illustrates the key functional components of the SC-2043-SG.
External Excitation
EX0+
CH0+
CH0-
EX0-
EX1+
CH1+
CH1-
EX1-
EX7+
CH7+
CH7-
EX7-
I/O Screw
Terminals
+-
External Power
Onboard/External
Power Supply
Selection Switch
Power
Converter
Offset
Nulling
Circuit
Half-Bridge
Completion
Jumper
Onboard/External
Excitation
Jumpers
Half-Bridge
Completion
Jumper
Half-Bridge
Completion
Jumper
Quarter-Bridge
Completion Resistor
(User-Installed)
±15 V
+5 V+5 V
+5 V Gnd
Local Excitation
Sense Jumper
Local Excitation
Sense Jumper
Unused Analog, Digital, and Timing I/O Lines of
MIO, MIO E, or Lab/1200 Series Board
x10
x10
50-Pin I/O Connector for Lab/1200 Series Board
x10
ACH0
ACH1
ACH7
DAC1OUT
50-Pin I/O Connector for MIO or MIO E Series Board
ACH0
ACH1
ACH7
ACH8
Internal
+2.5 V
Excitation
Half-Bridge
Completion Reference
Offset
Nulling
Circuit
Lowpass Filter
(Buffered)
Lowpass Filter
(Buffered)
Lowpass Filter
(Buffered)
Offset
Nulling
Circuit
Figure 4-1. SC-2043-SG Block Diagram
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