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8990ARC Instruction Manual
11
Installation
GPI Control
The GPI control input at BNCs J7 or J8 (not both) on the rear panel is a
loop-through input to an A/D converter and a 1.21 K
Ω
resistor to +5 V.
When the module’s GPI function is enabled, the 8990ARC software will
recognize a GPI input voltage level to select one of four stored user-defined
modes. Looping the input to additional modules allows a single GPI signal
to set them all (up to 10 modules).
The GPI input is created by the application of a parallel resistor between
the coax center and common ground that results in a voltage lower than
+5 V to the A/D converter.
The following voltages (all ±0.4 V) will select the GPI register indicated:
•
1.25 V = GPI 1
•
2.08 V = GPI 2
•
2.92 V = GPI 3
•
3.75 V = GPI 4
The resistors required for these voltages are shown in
Figure 4. Typical GPI Input Circuit Diagram
1
2
3
4
402
Ω
Open
845
Ω
1690
Ω
3570
Ω
Connects to
J7 or J8
8036_07
Note:
Resistor tolerance = 1%
Only one GPI input can be used
Содержание 8990ARC -
Страница 6: ...6 8990ARC Instruction Manual Preface ...
Страница 37: ...8990ARC Instruction Manual 37 Configuration Figure 14 Settings Web Page for 4 3 Output Format ...
Страница 41: ...8990ARC Instruction Manual 41 Configuration Figure 18 8990ARC Slot Config Web Page ...
Страница 52: ...52 8990ARC Instruction Manual Functional Description ...
Страница 56: ...56 8990ARC Instruction Manual Index ...