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12
V550-A20 Operation Manual
Section
3-
12
Connecting Your V550-A20 To An External Device
Parallel Output Connections
The following diagrams show the proper connections that you need
to ensure that the outputs function properly.
V550-A20
15
6
1
1
GND
OUT 0
4
Load
+
-
+
V550-A20
15
6
1
1
GND
OUT 1
5
Load
+
-
+
Output Connections
The table below defines some basic terminology. The drawing below
shows the schematic of the outputs circuitry:
Model 20
15
6
1
4
5
2 TTL
Outputs
(Optional CTS)
Pins
OUT 0
OUT 1/CTS
10K
10K
820 OHM
1
2
3
820 OHM
OUT 1
OUT 0
+5V
3 to 7 KOHM
RS232
IC
The V550-A20 Output Circuitry
For true TTL compatible
output from pin 5, an
external 750 OHM
pullup resistor is
required between pin 5
and pin 14.
V550-A20
+5V
Содержание V550-A20
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