GAI-Tronics MRTI 2000 (No. PL1877A) Microprocessor Radio Telephone Interconnect Installation & Service Manual - Manual (Page 108)

Parameter Modification PL1877A Microprocessor Radio Telephone Interconnect
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Emergency Call Direct Access
Parameter Function
24 Disable emergency call direct access = 0
Enable emergency call direct access = 1
Default = 0
With this feature enabled, a caller or attendant that has dialed into the patch (and has
been answered by the patch) and is waiting (channel busy, another call, no mobile
answer, etc.) can declare an emergency and immediately be connected to the radio by
sending ***.
The patch returns a connect beep, and cuts through the conversational audio (this occurs
even if the channel is busy).
The duration of channel access is governed by the value of parameter 126.
Mobile Security Code (Privileged User Override)
Parameter Function
60 Disable control of external devices using the security code = 0
Enable control of external devices using the security code = 1
Default = 0
In some installations, it is desirable to operate an external device whenever the security
code has been entered by the mobile user. An example of such an application would be
operating a second PL code. This function should not be used in installations where
receive audio is used as the mobile carrier indicator (parameter 03 = 0, parameter 05 =
1). With this parameter enabled, the monitor relay activates whenever the security code
is received. It remains active until the patch disconnects again.
416-421 DTMF Security Code (Privileged User Override Code) - Refer to the section on Multi-
digit Access/Release in this manual.
Station/Repeater Enable Feature
The station/repeater enable feature allows a mobile user to selectively enable the PL1877A and/or
associated station. Until the station repeater enable command (n**#, where n is the station/repeater
enable prefix stored in parameters 428–433) is received, the PL1877A will not respond to any mobile
commands. However, the PL1877A transmits ring and/or selective signaling in response to phone line
activity.
Upon receiving the station/repeater enable command, the PL1877A activates the monitor output. This
output can be used to enable the base station or repeater, if desired. The PL1877A remains responsive to
mobile DTMF commands for 7 minutes following reception of the enable command. The monitor output
remains active for that entire duration. If the mobile accesses the phone line during the 7 minutes, the
PL1877A remains responsive to mobile DTMF (and keeps the monitor output active) until disconnection
occurs.
The mobile user can refresh the 7-minute timer by sending the *** command. He can disable the
PL1877A and deactivate the monitor output by sending a disconnect sequence (# or ## with any required
multi-digit prefix/suffix) at any time.