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DMC-3425 Appendices• 189
Output Command
Result
CB
n
V
out
= GND
iso
SB
n
V
out
= V
iso
The resistor pack RPx3 is removed to provide open collector outputs. The same calculations for
maximum source current and low level voltage applies as in the above circuit. The maximum sink
current is determined by the NEC2505, and is approximately 2mA.
Open Collector
1/4 NEC2505
To DMC-3425 +5V
DMC-3425 I/O
I/O
n
OUTC
n
1/8 RPx2
Figure A-9 – Open Collector
Electrical Specifications
• I/O points, configurable as inputs or outputs in groups of 8
Digital Inputs
• Maximum voltage: 28 VDC
• Minimum input voltage: 4 VDC
• Maximum input current: 3 mA
High Power Digital Outputs
• Maximum external power supply voltage: 28 VDC
• Minimum external power supply voltage: 4 VDC
• Maximum source current, per output: 500mA
• Maximum sink current: sinking circuit inoperative
Standard Digital Outputs
• Maximum external power supply voltage: 28 VDC
• Minimum external power supply voltage: 4 VDC
• Maximum source current: limited by pull up resistor value