X64 Xcelera-CL PX4 User's Manual Appendix: X-I/O Module Option • 107
TTL Output in NPN Mode: Electrical Details
When the TTL outputs are configured for NPN mode (open collector - sink mode) the user is required to
provide an external input pull-up resistor on the signal being controlled by the X-I/O output. A simplified
schematic and important output specifications follow:
Output 1
Output 2
Output 3
Output 4
Output 5
Output 6
Output 7
Output 8
GND
GND
External Pull-up Resistor
Device Input
Device Input GND
DB37
Connector
Simplified
Output Driver
typical 8 places
X-I/O Module
22
3, 23, 24
4
35
17
36
18
37
19
16, 29, 30
NPN Open Collector Output Mode
5V or 24V typical
( 220 ohm @ 5V typical )
• Each output can sink 700 mA.
• Over-current thermal protection will automatically shut down the output device.
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