GAI-Tronics MRTI 2000 (No. PL1877A) Microprocessor Radio Telephone Interconnect Installation & Service Manual - Manual (Page 89)

PL1877A Microprocessor Radio Telephone Interconnect Parameter Modification
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4. If you wish to abandon modification of this phone number without saving any of your input, you can
enter #* or ##. #* causes the PL1877A to abandon your input, transmit three beeps, and wait for you
to enter a new auto-dial location number (followed by a *). This command is useful if you have
made a mistake and wish to start over. ## causes the PL1877A to abandon your input and exit the
auto-dial programming mode. You can enter ## from any point in the auto-dial programming mode.
5. When you have entered the desired telephone number and wish to store it, enter *#. The PL1877A
saves your input, returns three beeps, and waits for you to enter a new auto-dial location number
(followed by a *). You can either modify another auto-dial number or exit the auto-dial
programming mode (by entering # or ##).
6. To clear an auto-dial location number, enter the auto-dial programming mode as described in 1
above. Then, enter the location number to be cleared (followed by a *). Then, dial *#. The
PL1877A clears the location, returns 3 beeps, and waits for you to enter a new location number
(followed by *).
Installation Parameters
Radio Interface
If the PL1877A is to operate in signal search simplex, program parameter 9 = 1, 70 = 0.
If the PL1877A is to operate in half duplex, program parameter 9 = 0.
If the PL1877A is to operate in enhanced VOX, program parameter 9 = 1, 70 = 1.
N OTE : Enhanced VOX option must be present for enhanced VOX to be operational.
Parameter Function
72 VOX detection threshold for enhanced VOX is more sensitive (threshold = -45 dBm) = 0
VOX detection threshold for enhanced VOX is less sensitive (threshold = -30 dBm) = 1
73 Expected phone audio level for enhanced VOX option is high = 0
Expected phone audio level for enhanced VOX option is low = 1
This parameter determines the maximum gain that can be added to phone line signals
that are below the compression threshold.
If parameter 73 equals 0, gain is 20 dB.
If parameter 73 equals 1, gain is 30 dB.
74 Switch notch filter ON = 1
Switch notch filter OFF = 0
Signal Search Simplex Mode
Description
The standard signal search frequency is two per second or every one-half second. The standard search
duration is 20 ms. If these times are not adequate (slower transmitter relays, etc.), they may be adjusted
to fit the individual requirements in the following ranges:
Frequency: 4 per sec to once every 2.5 sec; Duration: 15–100 ms.