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Note 3.1: Interfacing to an RS-422 Driver Output
V (+)
RS-422
Compatible
1
Driver
V (+)
RS-422
Compatible
2
Driver
User Signal Ground
Note 3.2: Interfacing to a TTL (also called Push-Pull) Output
TTL signal source & Buffer Driver
(example: 74ACT244)
GND
The graphic shows a single-ended driver signal interfaced to the RS-422 input.
•
RS-422 (-) input is biased to a DC voltage of +2 volts.
•
This guarantees that the TTL signal connected to the RS-422 (+) input will be detected as a
•
logic high or low relative to the (-) input.
Xtium-CL PX4 User's Manual
External Signals
Figure 28:External RS-422 Signals Connection Diagram
Interfacing TTL Output to RS-422 Inputs
via a Line Buffer/Driver
Bias Voltage
+2V
DC
Figure 29: Interfacing TTL to RS-422 Shaft Encoder Inputs
Xtium-CL PX4
1
:
Ground
2
:
Shaft Encoder A (-)
3
:
Shaft Encoder A (+)
4
:
Ground
5
:
Shaft Encoder B (-)
6
:
Shaft Encoder B (+)
7
:
Input Common Ground
8
:
General Input 1 / Trigger 1
9
:
General Input 2 / Trigger 2
10 :
Ground
11 :
General Output 1 / Strobe
12 :
General Output 2
13 :
Ground
14 :
Power (12 Volts)
15 :
General Input 3
16 :
General Input 4
17 :
Reserved
18 :
Reserved
19
:
Reserved
20
:
Reserved
21 :
General Output 3
22 :
General Output 4
23 :
Reserved
24 :
Reserved
25 :
Reserved
26
:
Reserved
27
:
Reserved
J1: External Signals Connector
(DH60-27P)
RS-422 (+) input
100 ohm
RS-422 (-) input
FG/system GND
Frame Grabber System
Technical Specifications • 75
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