User manual

I/O Connector Pinout
2526 24 23 22 21
89 7654321
1718 16 15 14 13
20 19
12 11
1
2
10
The I/O (Input/Output Status) connector provides information about trigger
function, DAC, and TTL signals. Inputs must be at least 3.15 V for a high and
less than 0.9 V for a low.
The numbers on the I/O connector diagram correspond to the numbers given
to the definition of each of the pins. The I/O connector is a female, DB26,
high- density connector. An I/O cable (Part #: 37-107-002) to access Trigger
Input (Pin 1), Trigger Invert Input (Pin 2), Frame Readout (Pin 7), Camera
exposing output (Pin 8), and Shutter Output (Pin 23) is available from Roper
Scientific.
Trigger Input: This input is internally tied high through a
4.7kΩ resistor. With Trigger Invert Input open or tied high, a
rising edge of the Trigger Input signal initiates the trigger.
The trigger source would normally hold this input low, then
drive it high to initiate the trigger. To change the state of this
input see Trigger Invert Input.
Trigger Invert Input: This input is internally tied high
through a 4.7kΩ resistor. With this input open or tied high, a
risin
g
ed
g
e on Tri
gg
er Input will initiate the tri
gg
er. With this
input pulled low, a falling edge on Trigger Input will initiate
the trigger. It can be pulled low by grounding it via a 50Ω
terminator.
3
4
GND: System digital ground. Any external circuitry
intended to interface with the trigger control signals must
reference this ground connection.
Port 4
DAC 1: 8-bit programmable output (0-5 V)
Port 5
5 DAC 2: 8-bit programmable output (0-5 V)
6 GND: System digital ground. Any external circuitry
intended to interface with the trigger control signals must
reference this ground connection.
7
8
Frame Readout: Active high. A high level on this output
indicates that data is being transferred.
Camera Exposing Output: Active hi
g
h. A hi
g
h level on this
output indicates that the camera is exposing (integrating).
9 Interline Shift: Active high. A high level on this output
indicates that shiftin
g
under the interline mask is in pro
g
ress.
Port 0
10
11
TTL I/O data bit 0: TTL level programmable input or output
TTL I/O data bit 1: TTL level programmable input or output
20 CoolSNAP
fx
/CoolSNAP
HQ
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