PC2-CamLink User's Manual
Part I: PC2-CamLink Board
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53
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:
IN(7-0)
Eight digital TTL input lines provide the capability to read these as either raw or latched (by
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.
I/O_INT
Interrupt input line that can be used to generate an interrupt (programmable edge).
Refer to
"
J8: Parallel I/O 26-Pin Dual-Row Connector
" on page 70
for the connector pinout
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
parameters
Description
Value
V
IH min
Minimum high-level input voltage
2V
V
IL max
Maximum low-level input voltage
0.8V
V
I max
Maximum input voltage
5.5V
I
OH max
Maximum high-level output current -32mA
(sourcing)
I
OL max
Maximum low-level output current
64mA (sinking)
Содержание PC2-CamLink
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