Tektronix OI1125, Instruction Manual, Page: 27 / 88

Operating Basics
OI1125 E/O Transmitter Instruction Manual
15
Using the Rear-Panel Remote Interface
This section describes using the rear-panel Remote Interface to select the
transmitted signal.
NOTE
. For the internal laser to function, either the laser safety interlock or an
external control circuit must be connected to the remote connector on the rear
panel.
When the REMOTE pushbutton switch on the front panel is in the disabled
mode, the Remote Enable LED is not illuminated, and you can control the
transmitter operation from the front-panel controls. To enable power to the
internal laser, you must have the laser safety interlock plugged into the remote
connector on the rear panel.
The laser safety interlock connects pins 1 and 2 of the remote interface together,
forcing the laser disable signal low, which activates the front-panel Laser Enable
keyswitch. The laser safety interlock can be activated by installing this 25-pin
male connector on the remote interface on the rear panel. See Figure 8.
The laser safety interlock is used together with the Laser Enable keyswitch on
the front panel to provide a redundant laser enable control for safety purposes.
When the laser safety interlock is removed from the remote interface, an internal
pull-up resistor on pin 2 forces the laser disable signal high, which deactivates
the front-panel Laser Enable keyswitch.
Figure 8: Laser safety interlock
Controlling Operation
Locallly
Laser Safety Interlock