Maple Systems OIT Family (ASCII) - Manual (Page 50)

sage key to display the prior screen or by configuring the password protected screen with the
timed display feature.
Disabled Function Key
If the function key is disabled, it will not function. This option is primarily provided for OIT
users who do not want or need the maximum number of function keys that are available.
Sending ASCII Strings and Displaying Screens
Besides modifying a Function Key coil, each function key can also send a predefined ASCII
string of characters to the ASCII host. Thus, the programmer has the ability to program each
function key to send a command to the ASCII host whenever the function key is used. Each
function key can be programmed for two ASCII strings of a maximum of 30 characters each.
One string is sent to the ASCII host whenever the function key is setting the Function Key
coil to 1 (simulating an “on” state), and the other string is sent to the ASCII host whenever the
function key is clearing the Function Key coil to 0 (simulating an “off” state).
The predefined ASCII strings that are sent to the ASCII host can contain not only printable
ASCII characters, including the space character (20 hex) to the tilde character (7E hex), but
non-printable control characters as well.
The following control characters are supported:
Code Hex Code Hex Code Hex Code Hex
SOH 01 HT 09 DC1 11 EM 19
STX 02 LF 0A DC2 12 SUB 1A
ETX 03 VT 0B DC3 13 ESC 1B
EOT 04 FF 0C DC4 14 FS 1C
ENQ 05 CR 0D NAK 15 GS 1D
ACK 06 SO 0E SYN 16 RS 1E
BEL 07 SI 0F ETB 17 US 1F
BS 08 DLE 10 CAN 18 DEL 7F
As with sending predefined ASCII strings, function keys can also be configured to display
two different preprogrammed screens when the function key is setting/clearing the function
key coil.
When the predefined ASCII strings are sent to the ASCII host and when the preprogrammed
screens displayed on the OIT, depends on how the function key is configured:
Momentary: When the function key is pressed (simulating an “on” state), a predefined
ASCII string can be sent to the ASCII host and a preprogrammed screen displayed on the
OIT. When the function key is released (simulating an “off” state), a different predefined
ASCII string can be sent to the ASCII host and a different preprogrammed screen displayed
on the OIT.
Push On/Push Off: When the function key is pressed (simulating an “on” state), a prede-
fined ASCII string can be sent to the ASCII host and a preprogrammed screen displayed on
the OIT. When the function key is pressed again (simulating an “off” state), a different pre-
defined ASCII string can be sent to the ASCII host and a different preprogrammed screen
displayed on the OIT.
Latch: When the function key is pressed (simulating an “on” state), a predefined ASCII
string can be sent to the ASCII host and a preprogrammed screen displayed on the OIT.
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