Z-World SR9300, Руководство пользователя

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4 Smart Star A/D Converter Cards (SR9300)
1.3 User Interface
Figure 2 shows the circuit used to condition the analog signal before it goes to the A/D
converter chip. Depending on the model of A/D converter card you have, it is designed to
handle analog inputs of 0 V to 10 V, -10 V to +10 V, or 4–20 mA. The two different volt-
age ranges are handled with different gain resistors, R
g
: 23.7 k
Ω
for the SR9300 and
12.1 k
Ω
for the SR9310. The input shown in Figure 2 is configured differently for the
SR9320, which handles analog inputs of 4–20 mA.
Figure 2. Analog Input Amplifier Circuit
Figure 3 shows the complete pinout for the user interface on header J2. Note that pin 1 is
indicated by a small arrow on the ribbon cable connector.
Figure 3. A/D Converter Card User Interface Pinout
1 nF
R
g
R
BOTTOM
R
TOP
VREF
Input
To ADC
100 k
W
10 k W
R
IN
C
FB
100 nF
AIN0
GND
AIN3
AIN4
GND
GND
AIN8
AIN9
GND
GND AIN1
AIN2
GND
AIN5
AIN6
AIN7
GND
AIN10
+5 V (ADC)
+2.5 V
J2