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Option –05 IEEE-488 Interface
INTRODUCTION
805-3
805-1. INTRODUCTION
The IEEE-488 Interface turns the 8842A into a fully programmable instrument for use
with the IEEE Standard 488-1978 interface bus (IEEE-488 bus). With the IEEE-488
Interface, the 8842A can become part of an automated instrumentation system. The
8842A can be under complete, interactive control from a remote bus controller, or it can
be set to the talk-only mode, connected to a data logger or printer, and dedicated to a
single task.
805-2. CAPABILITIES
The IEEE-488 Interface provides remote control of all front panel controls except for the
POWER, CAL ENABLE, and FRONT/REAR switches. Other features include:
• A simple and predictable command set
• Fast measurement throughput
• Full talk/listen capability, including talk-only operation
• Full serial poll capability, with bit-maskable SRQ
• Full remote/local capability, including local lockout
• External Trigger and Sample Complete connectors
• Remote calibration
• Programmable trigger sources, including two bus triggers
• Informative output suffix (suppressible)
• Selectable output terminators
The 8842A supports the following interface function subsets: SH1, AH1, T5, L4, SR1,
RL1, DC1, DT1, E1, PP0, and C0.
805-3. EXTERNAL CONTROLS
When the IEEE-488 Interface is installed, the rear panel contains EXT TRIG (External
Trigger) and SAMPLE COMPLETE connectors. These controls can be used even when
the 8842A is disconnected from the IEEE-488 bus. Refer to Section 2 for details.
805-4. INSTALLATION
The IEEE-488 Interface is contained on a single, easy-to-install printed circuit assembly
(PCA). To install the option, proceed as follows:
WARNING
TO AVOID ELECTRIC SHOCK, DISCONNECT THE POWER
CORD AND ANY INPUT LEADS BEFORE REMOVING THE
INSTRUMENT CASE.
1. Remove the grounding screw from the bottom of the case and remove the two
rear panel mounting screws (Figure 805-1A).
2. Holding the front panel, slide the case and rear bezel off of the chassis (Figure
805-1B). Note: At this point, the rear bezel is not secured to the case.