158 PI-MAX/PI-MAX2 System Manual Version 5.F
Serial COM Connector: Provides two-way
serial communication between the controller and
the host computer.
Trig. LED: Trigger indicator. A 100 ms flash is
produced each time the PTG triggers. With
repetition rates faster than 10 Hz, indicator glows
continuously.
Ext. Trig. In.: When external triggering is
selected in the software, 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 ) are selectable in software.
Power Module: Contains the powercord socket
and two fuses. Depending on the ST-133 version,
the power switch may be located directly above
the power module.
Pre. Trig. In: TTL level used only to start a
bracket pulse.
Fuse/Voltage Label: Displays the controller’s
power and fuse requirements. This label may
appear below the power module.
T0 TTL Trigger output coincident with
PI-MAX gate. This output does not need to be
connected to the PI-MAX.
USB 2.0 Connector: Provides two-way serial
communication between the controller and the host
computer. Uses USB 2.0 protocol.
Fan: Cools the controller electronics. Runs
continuously when the controller is turned on.
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