5
COMMAND STRUCTURE
The command structure of the Linker IIa is easy to use and very versatile. It includes a Setup mode for
programming and 2 levels for control. The two levels are the Control operator mode and User mode. The structure
of these levels gives needed security and still provides a very easy system to setup and program. The Setup mode
gives you direct access to all the functions directly. In Setup mode the function codes are entered directly with your
DTMF pad. The Control op and User modes are very similar to each other. To access a command in either of these
modes you need to have programmed (from Setup mode) a DTMF sequence (1 to 5 DTMF digits) followed by the
function in a DTMF memory. When you enter the DTMF codes in Control op or User mode that are in a DTMF
memory the command in the DTMF memory will be called. A condition code can be added to the DTMF memory
to restrict that DTMF memory (and its command) to the Control op mode only, the command will then not be
accessible in the User mode.
The Setup mode (program mode) allows access to all the functions. All the functions can be activated just by
entering the 2 or 3 digit code for that function. When the Linker IIa controller leaves the factory the only way to
access the Setup mode is with the hardware jumper. It initially can not be accessed any other way. Normally if the
Setup mode jumper is in you are in Setup mode and if it is not in you are not in Setup mode. There are two
functions that can be used to enter and exit the Setup mode remotely, ‘Exit Setup mode’ (see function #59)and
‘Enter Setup mode’ (see function #58). The Setup mode can be accessed by putting the ‘Enter Setup mode’ function
in the Control op or User modes using a DTMF command memory (see function #78). The 1 to 5 digits you
program in will give you access to the Setup mode. If you only allow access to the DTMF code for the Setup mode
in Control op mode the Linker IIa can be setup to require up to 10 digits to access the Setup mode, 5 digits to go
from the User mode to the Control op mode and 5 digits to access the DTMF memory you programmed the “Enter
Setup” command into. Remote access to the Setup mode is only available if you make it so.
When the Linker IIa is in the Setup mode (program mode) the Linker IIa uses a special courtesy tone. The courtesy
tone is 3 dits or a Morse code “S” to indicate being in Setup mode. If the repeater is left in the Setup mode and the
repeater can not be physically accessed to remove the Setup jumper the Setup mode can be exited using the 2 digit
‘Exit Setup mode’ function. This is true even if the Setup jumper is still installed.
The Control op mode is intended to give access to control functions that only a few people should have. In the
Control op mode all the preprogrammed DTMF memories are available. In the User mode you can provide limited
access to the DTMF memories. Only the DTMF memories that have not been setup as Control op level, will be
accessible in User mode. Any, some or none of the Linker IIa’s commands can be enabled on this level. You
program any of the functions you want to give access to and on what level.
To give access to a function in the Control Operator or User modes a DTMF code and a function must be entered in
a DTMF memory. You must be in Setup mode to program a DTMF memory. To start the entry use the “ENTER
DTMF COMMAND LINE” function (#78). First you select a DTMF memory 0 – 24, then enter to 5 DTMF code
digits, then indicate if this DTMF memory is to be only available in the Control op level and of course the function
you wish to give access to (see the ENTER DTMF COMMAND LINE (#78) function in the function descriptions).
All 16 DTMF digits can be used in a DTMF code including A, B, C, D, * and #. An example of the DTMF code
layout for a few DTMF memories is shown below;
DTMF Memory number | DTMF codes, 1 to 5 digits | Control Op? | function
0
`
2 # 0
N
33 (DISABLE TX 1)
1
2 # 1
Y
32 (ENABLE TX 1)
2
3 9 0 B #
N
60 (SET CONTROL OPERATOR MODE)
3
C
Y
61 (CLEAR CONTROL OPERATOR MODE)
4
A # 4 B 2
Y
58 (ENTER SETUP MODE)
5
B
N
48 (ACTIVATE KEYPAD TEST)
Any of the functions can be used in a DTMF memory. There is a chart at the end of this manual that is similar to the
above and can be copied and used to keep track of your DTMF settings. Note: The Linker IIa controller comes with
all DTMF memories empty, you must use Setup mode (program mode) initially for access to the Linker IIa’s
functions.
Содержание Linker IIa
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