Arbiter Systems 931A, Operation Manual

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2.5.2 Keypad
The main keyboard consists of 18 multi-function keys whose primary
functions generally relate to the most commonly used features. Access
secondary functions by first pressing the SHIFT key and then the sec-
ondary function key. When a menu operation requires cursor movement
or data entry, the top row of keys functions as such.
2.6 RS-232C Interface
The Model 931A includes an RS-232C communications port, which allows
remote control and command of the instrument using a PC, modem, or
terminal. When connecting the Model 931A to a PC, use the supplied
null-modem cable.
The RS-232C port may also be used to connect a
printer to the instrument. Serial port configuration information for the
RS-232C port is described in Section 4.3.7 and RS-232C commands are
listed in Appendix B. Refer to Section 3.11.6 for information on printing
and exporting data. Table 2.3 lists the connector types, pin locations and
signal descriptions for the RS-232C port of the Model 931A and other
devices.
Once properly set up, a host computer may assume total control. All
functions and data available from the front panel are also available to the
host computer. All commands consist of three letter commands preceded
in some cases by setup parameters separated by commas. The Model 931A
does not echo commands. Once a valid three-letter command has been
received, it will be acted upon immediately. The action taken depends
on the command given. “Display change,” “setup modification,” “data
output (or export),” and “data logging” are some examples. When the
Model 931A returns a “?” it signifies an unrecognizable command or an
out-of-bounds number.
2.7 Power Supply and Battery
The Model 931A can operate either from an internal, rechargeable battery,
or from an external AC/DC power source.
2.7.1 Battery Power
In normal operation, the battery will operate the Model 931A for eight
hours on a full charge.
Factors affecting the operating time include:
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