Parallel I/O - Dalsa PC2-CamLink User Manual

Parallel I/O

PC2-CamLink provides digital I/O capability for controlling or monitoring external events. The digital
input and output lines, available on the 26-pin header located at the top of the board, can be cabled to a
25-pin D-Sub connector that occupies an open slot in the PC chassis. The functionality of the I/O port
is as follows:
Eight digital TTL input lines provide the capability to read these as either raw or latched (by
IN(7-0)
STROBE_I) inputs.
OUT(7-0) Eight digital TTL output lines driven by a programmable register.
STROBE_I Input strobe signal can be used to latch the 8-bit input data (if this mode is selected). The
polarity of STROBE_I is programmable.
STROBE_O Output strobe signal is an output line under software control.
Interrupt input line that can be used to generate an interrupt (programmable edge).
I/O_INT
Refer to "J8: Parallel I/O 26-Pin Dual-Row
information.
The Parallel I/O is backward compatible with PC2-Vision and has the ability to provide power to an
external box: Two dedicated 5V 500mA power pins (with fuse protection) are available.
The Parallel I/O functions using LVT244 drivers with the following electrical characteristics. The
model is a 3.3V low-voltage TTL device that is 5V tolerant.
Electrical Description
parameters
V Minimum high-level input voltage
IH min
V Maximum low-level input voltage
IL max
V Maximum input voltage
I max
I Maximum high-level output current
OH max
I Maximum low-level output current
OL max
PC2-CamLink User's Manual
Connector" on page 70 for the connector pinout
Value
2V
0.8V
5.5V
-32mA (sourcing)
64mA (sinking)
Part I: PC2-CamLink Board • 53