GAI-Tronics MRTI 2000 (No. PL1877A) Microprocessor Radio Telephone Interconnect Installation & Service Manual - Manual (Page 58)

PC Programming PL1877A Microprocessor Radio Telephone Interconnect
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Service Adjust – Manual Off hook - Telephone Line Off hook Threshold Voltage
The off-hook threshold determines the maximum phone line voltage at which the PL1877A recognizes
that the line is in use by an attendant telephone. Valid entries are 6 through 48 volts.
N OTE : Talk Battery Voltage must be set to allow manual adjustment of the off hook threshold. This
must already be programmed into the PL1877A, whose threshold voltage is to be changed (not merely in
the current parameter settings). Otherwise, the PL1877A automatically resets the off-hook threshold to a
default value upon exiting the IAPS session.
Set Local
After clicking on the Set Local button, the computer sends commands to change the threshold. It then
reads back the threshold voltage to verify that the change was successful.
Set Remote
After clicking on the Set Remote button, you go to the Dialing Screen where you may select the
telephone number to access the PL1877A. Click on Dial to dial the number. You are returned to the
previous screen. After the PL1877A answers, click on the OK button. It should now process as
described in Set Local.
Entering Programmed Parameters
After all desired parameters are entered, select Program ITI6000A from the Input/Output Menu on the
Main Menu. Select the Program ITI6000A tab and click on Program Local or Program Remote. Name
the programming file and click on OK.