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Local Interface Device (HSIO) (Fig. 74) — The
HSIO consists of a keyboard with 6 function keys, 5 opera-
tive keys, 10 numeric keys (0-9), and an alphanumeric
8-character liquid crystal display (LCD). Key use is ex-
plained in Table 10. Each function has one or more subfunc-
tions as shown in Table 11. These functions are described in
greater detail in the Control Operation section of this book.
The HSIO can be factory-or field-installed, and can be re-
motely mounted if necessary.
Table 10 — Local Interface Device Key Usage
FUNCTION
KEYS
USE
Status — Display diagnostic codes and current
operating information about the machine
Quick Test — Check inputs and outputs for
proper operation
History — Check latest service dates and
alarms in order of occurrence
Service — Enter specific unit configuration
information
Set Point — Enter operating set points and
day/time/date, holiday, and daylight savings
time information
Schedule — Enter occupied/unoccupied sched-
ules for unit operation
OPERATIVE
KEYS
USE
Expand Display — Display a non-abbreviated
expansion of the display
Clear — Clear the screen of all displays
Up Arrow — Return to previous display position
Down Arrow — Advance to next display
position
Enter data
Fig. 71 — Processor Module (PSIO Master/Slave)
Fig. 72 — Relay Module (DSIO)
LID — Local Interface Device
Fig. 73 — Sensor Bus Wiring (Communications)
Fig. 74 — Local Interface Device
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