VC20XX_HW.pdf – Hardware Documentation VC20XX Smart Cameras
12
4.2 Output Signals
Operating voltage:
24 V +/- 20%, external source
Absolute maximum voltage:
voltages greater than 40 V can destroy the outputs
Type:
galvanically separated by MOSFET optocouplers
Switching voltage:
positive switching
Current:
max. 400 mA per output
Absolute maximum current:
total currents greater than 1000 mA can destroy plugs and
cables
Always consider the total sum of all output currents
Switching power:
max. 9.6 W (24 V * 400 mA) per output
Reverse voltage protection
yes, for external voltage
Protection against inductive
loads:
yes
Resistance when switched on: 0.2 - 0.8 Ohm
Short circuit protection:
full protection
4.3 Trigger input and trigger output
The board features a dedicated fast TTL trigger input (for use as image capture trigger) and a fast TTL
trigger output (as strobe-light trigger). Since both signals are fast at a very low noise margin, it is
recommended to keep the cable as short as possible. Use twisted pair or even coaxial cable for this
purpose. The trigger input has a built-in photocoupler to eliminate ground loops with the external
circuitry. The trigger output, however, is not galvanically separated. The receiving circuit should,
therefore, have a photocoupler of its own.
Please note that input and output are not protected against overcurrent. The output is neither
protected against short circuit nor reverse voltage spikes from inductive loads.
Trigger input assures constant delay without jitter.
Technical data of trigger input:
input voltage:
3-5 V (TTL, CMOS)
input current:
5mA @ 3V / 11mA @ 5V
limiting resistor:
built in, 330 Ohm
knee voltage:
1.5 V
reverse voltage protection:
shunt diode
switching delay:
max. 2
µ
sec + interrupt latency
Trig. In+
yellow cable
Trig. In-
green cable
330 R
©
1996-2005 Vision Components GmbH Ettlingen, Germany
