Specifications

Chapter 2 Getting Started 23
TTL IN/OUT connector: This 25-pin connector (type DB25) provides a
programmable interface. There are eight input bits and eight output bits
that can be written to or polled to provide additional control or
functionality. For the IN lines, a bit can be set to the buffered state,
resulting in a real-time sample or it can be set to the latched state, where
the signal is maintained once set. See Appendix C for a description of
the pin assignments and refer to your software manual for calling
conventions.
AUX BNC connector: Not currently activated. Reserved for future use.
SERIAL COM connector: The cable that goes to the computer connects to
this DB9 connector. Its purpose is to provide two-way serial
communication between the controller and the computer. When
connecting this cable, it is essential that the cable connector locking
screws be tightened securely to ensure reliable operation.
If the application requires use of the optional fiber-optic data link to
increase the maximum allowable distance between the Camera and the
computer, the fiber-optic “pod” would be connected to the Serial Com
connector with a short length of cable. Then the long-distance cable
would be connected to the pod. A similar fiber-optic pod connection
would be required at the computer.
See Appendix I, Installing the Computer Interface, for detailed
information on installing and testing the serial interface link.
To minimize any possible risk to system equipment, we recommend that the serial link
cable not be connected or disconnected when the system is powered.
Programmable Timing Generator Module: This module, which, if present, should
always be located in the third slot, provides the following functions. See
Appendix B for a more detailed description of the PTG and its operation.
Ext. Trig. In: The PTG can be either internally or externally triggered as
selected in software. If external triggering is selected, the PTG will be
triggered by an externally derived trigger pulse applied to this input. The
threshold (range ±5 V), slope, coupling mode (ac or dc), and input
impedance (High or 50 Ω) are selectable in software.
Pre. Trig. In: TTL level used only to start a bracket pulse.
T0: TTL Trigger output coincident with PI-MAX gate. This output does not
need to be connected to PI-MAX.
Timing Gen: Gate Start/Stop and Bracket signals are provided at this
connector. This output must be cabled to the PI-MAX
Timing Gen
connector.
CAUTION