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17-4

Timed Execution:

Normally when you enter a DTMF command, you unkey to tell the controller it is time to execute

the command. If you enter a command and wait longer than a few seconds (see the DTMF

interdigit timer - command 020) the controller assumes that you didn't want to do that command

and it throws it away. This keeps a digit accidently entered from messing up a command you might

enter 30 seconds later (if you didn't unkey in the meantime). It also reduces the likelihood of

DTMF voice falsing (see introduction to Chapter 3) causing a command to be executed accidently;

if your voice falses the decoder and you don't unkey for a few seconds, the controller will just

discard that falsed digit. There are times, however, when it isn't possible to unkey and it would be

handy to have another way to tell the controller to execute. If your repeater squelch gets stuck

open or someone sits on their mike, the controller won't be able to tell if you unkey. In this

situation, you can enter a command and then force it to execute with the force-execution digit

(normally 'D', but can be changed with this command). If your radio doesn't have 'D' on the DTMF

keypad, you won't be able to do this. Another situation is when you call in on the reverse

autopatch; you can't unkey and most phones don't have the 'D' key. In either of those cases, you

might want to turn on timed execution. When timed execution is turned on, instead of throwing a

command away if you pause for a few seconds, the controller executes it. This is the preferred

method of entering commands on the reverse autopatch. If you use it, you will probably want to

shorten the DTMF interdigit timer (see command 020) to 2 or 3 seconds. This option is typically

only used on radio ports if you are controlling from a radio that doesn't have 'D' on its DTMF

keypad. This option is not available (the setting is ignored) for commands entered from the serial

port.

The Force-Execution Digit:

As mentioned previously, the force-execution digit tells the controller to immediately execute any

command that may have been entered, without waiting for you to unkey. It is recommended that

you leave this digit set to 'D' in most cases, but if you need to change it, 'A', 'B', 'C' and '*' are other

acceptable choices ('*' and ‘#’ work pretty well from the reverse autopatch if you don't want to use

timed execution). Please note that you will not be able to use any commands that have the force-

execution digit in their names, so avoid that digit when setting up command names. If you use '*'

as the force-execution digit for your repeater port, you will not be able to use '*' as your autopatch

up code. If you use the DTMF mute bypass feature (see introduction to Chapter 3), your choice of

force-execution digit will affect that as well.

Advanced Note:

If you are trying to change the force-execution digit for one port (call it 'A') by entering this

command on another port (call it 'B'), you will be unable to change A's force-execution digit to be

the same as B's in the normal way. This is because when port B sees that digit, it can't tell whether

you want it to execute immediately or whether that is what you are trying to change A's force-

execution digit to. The easy solution is to enter this command from the port that you are trying to

change. If you must enter it from another port, specify the new force execution-digit to be a ‘9' (or

any other decimal digit). The controller will consider this to be a special case (since changing the

force-execution digit to a ‘9' would normally be a very bad idea) and will instead change it to be the

same as it is for the source that entered the command. If you didn't understand this paragraph, just

ignore it.