9-1
RLC-4 V1.79 Copyright © 1998 Link Communications Inc. 9/18/98
Chapter 9: Pre-Access Commands
What preaccess is:
Preaccess is a system used by several large linking sytsems to specify which controller in the
network a DTMF command is intended to go to. A common configuration would be to enter the
"*" key before commanding the local repeater, "#99" before commanding a distant controller via a
link, and "#98" before commanding a different controller on the linking system. The advantage of
requiring the user to "preaccess" a controller before commanding it is that you can use the same
command names on each controller without confusion as to which one you are talking to. This is a
very simplified description, but it should give you the idea. If you are not using the RLC-4 on a
large linking system, or if you are but don’t plan to use preaccess, you can skip the rest of this
chapter.
What you need to know:
Because the preaccess system works quite differently from the way the RLC-4 normally works,
there is a lot involved with changing back and forth. Command 073 has been provided to make the
conversion to preaccess easier.
The preaccess features can be enabled/disabled separately for each port, so you can set up one port
for preaccess and leave another port alone. This allows you to have a mixed system. This might be
useful if you want to try out preaccess on one port without forcing all of the users of a repeater on a
different port to change the way they do things. It also allows you to use the RLC-4 to interface
between linking systems that do things differently.
About Preaccess Repeaters:
To execute commands from a repeater that is configured for preaccess, key up, press the '*' key and
enter the command. The command will be executed immediately, without waiting for you to unkey.
This allows you to execute multiple commands in sequence without unkeying after each one. Also,
when you press the star key, you will be removed from any other repeaters or links you may have
been connected to. In other words, the '*' puts you into a local control mode. This mode will
expire if you unkey for 8 seconds (see command 076).
If you key the repeater and do not press the '*' key, you will not be in the local control mode and
will be connected to other ports normally (see Commands 000, 001 and 002).
About Preaccess Links:
Links that are configured for preaccess will ignore any DTMF tones that are not preceeded by c..c
where c..c is the site access code you specify with command 073. This allows commands to be sent
down a linking system without every controller along the way trying to execute them, sending error
messages, etc. To execute a command from such a link port, key up, enter c..c and the command.
It will be executed when you unkey or press 'D'
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