Maple Systems OIT Family (ASCII) - Manual (Page 47)

Function Keys
Each OIT has 6, 12, or 16 global function keys which can be programmed to display mes-
sages, send ASCII strings to the ASCII host, and turn on/off Function Key coils (OIT coil
registers). In addition, the OIT5400B has 5 screen dependent function keys. Each screen de-
pendent function key can be programmed to perform a different function in each of the
OIT5400B’s 250 pre-programmed screens. When the OIT is programmed, each function
key is assigned to a particular Function Key coil. This Function Key coil is controlled by the
function key if the function key is configured as Momentary, Push On/Push Off, or Latch. If
the function key is disabled or configured as Screen Display, then the Function Key coil as-
signed to the function key can be used for other purposes.
Initialization Mode
When the OIT is powered, the function keys are initialized in one of two modes:
Default Mode
In Default Mode each OIT coil register is set/reset according to the configuration of each
function key:
• If the function key is configured as Screen Display or Disabled, no change is made to the
OIT coil register.
• If the function key is configured as Momentary or Latch, then the OIT coil register is
cleared to 0.
• If the function key is configured as Push On/Push Off normally open key (On/Off or
Blink/Off), then the OIT coil register is set to 1.
• If the function key is configured as Push On/Push Off normally closed key (Off/On or
Off/Blink), then the OIT coil register is set to 0.
46 OIT Family Operation Manual (ASCII)
1010-0088, REV02
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Five Screen Dependent Function Keys
OIT5400 240x64 Backlit Graphic Display
Horizontal and
Vertical Bar Graphs
F1
F2
F3
F4
F5
F6
F7
F8
F9
F10
F11
F12
F13
F14
F15
F16
S 1
S 2
S 3
S 4
S 5
S 6
S 7
S 8
Global Function Keys
Screen Dependent Function Keys