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Chapter 4, FRONT AND REAR PANELS
4.2 Rear Panel - Main Console
4.2.01 Line Power Switch
4.2.02 Line Power Input Assembly
4.2.03 DIGITAL I/O Connector
4.2.04 USB Connector
4-6
Figure 4-5, Model 7124 Main Console Rear Panel Layout
As shown in figure 4-5, the line power switch, line power voltage selector, two
RS232 connectors, USB, LAN and digital I/O port connectors, preamplifier power
connector, four fiber link connectors, and thirteen BNC signal connectors are
mounted on the rear panel of the main console. Brief descriptions of these are given
in the following text.
CAUTION: The model 7124 may be damaged if the line voltage is set for 110 V
AC operation and it is turned on with 220 V AC applied to the power input
connector. Please ensure that the line voltage selector is set to the correct line
voltage before switching on.
Press the end of the switch marked I to turn on the instrument's power, and the other
end marked O to turn it off.
This houses the line voltage selector and line input fuse. To check, and if necessary
change, the fuse or line voltage see the procedure in section 2.1.05.
This connector provides eight TTL lines, each of which can be configured as an
input or output. When set as an output, the line can be set high or low by the use of
the Digital Port menu or via the computer interfaces, and when set as an input, the
applied logic state can be read.
The port is most commonly used for controlling auxiliary apparatus, such as lamps,
shutters and heaters, and reading status signals from auxiliary equipment. Pinouts for
this connector are given in appendix B.
This connector allows the instrument to be connected to a PC-style computer running
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