Princeton Instruments PhotonMAX System, Руководство пользователя

Страница: 85 / 98

Appendix A Basic Specifications 85
PORT # PIN # SIGNAL Description
1
Trigger Input: This input is internally tied high through a
4.7k
Ω
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.
2
Trigger Invert Input: This input is internally tied high through
a 4.7k
Ω
resistor. With this input open or tied high, a rising
edge on Trigger Input will initiate the trigger. 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 50
Ω
terminator.
3
GND: System digital ground. Any external circuitry intended to
interface with the trigger control signals must reference this
ground connection.
Port 4
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
Frame Readout: Active high. A high level on this output
indicates that data is being transferred.
8
Camera Exposing Output: Active high. A high level on this
output indicates that the camera is exposing (integrating).
9
(not used)
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
Port 1
12
13
TTL I/O data bit 0: TTL level programmable input or output
TTL I/O data bit 1: TTL level programmable input or output
Port 2
14
15
TTL I/O data bit 0: TTL level programmable input or output
TTL I/O data bit 1: TTL level programmable input or output
Port 3
16
17
TTL I/O data bit 0: TTL level programmable input or output
TTL I/O data bit 1: TTL level programmable input or output
18
GND: System digital ground. Any external circuitry intended to
interface with the trigger control signals must reference this
ground connection.
19
Power Status: A high level on this output indicates that the
camera power is switched on (+5 V = on, 0 V = off).
20
GND: System digital ground. Any external circuitry intended to
interface with the trigger control signals must reference this
ground connection.