Contec ADI12-16(PCI), Руководство пользователя

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3. External Connection
46
ADI12-16(PCI)
Digital I/O signals and Control signals
Connection
The digital I/O signals and the control signals (external trigger input signal, sampling clock output
signal and so on)are interfaced through the connector CN2.
User can use an optional flat cable DT/E1 or DT-E3 (with bracket and a 15-pin D-SUB female
connector) to connect these signals to your external devices.
Connecting the input signal
To the digital input signal and control signal (External Start Trigger Input, External Stop Trigger Input,
External Sampling Clock Input) pins, connect current driven devices such as a switch and a transistor
output device. Input circuit is as follows. +Common In is common to individual input signals. An
external power supply is required to drive the input circuit. The power capacity required at this time is
about 8 mA per input channel at 24 VDC (or about 4 mA at 12 VDC).
Figure 3.11. Input Circuit
External device Board
VCC
VCC
Opto-coupler
Input pin
+Common In
External power supply
12 - 24VDC
Switch
Input pin
Opto-coupler
Switch
5.1
Ω
5.1
Ω
3k Ω
3k Ω