ZETRON 15P, Руководство по эксплуатации

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Section 4. Installation
4-3
DIGITAL MODE
The digital mode output at TB1 pin 8 is used to indicate when the encoder is supplying a
analog paging signal at TB1 pin 4 as opposed to when it is supplying a digital waveform at
TB1 pin 9. This information is used by digital capable paging transmitter to select the correct
modulation input when transmitting a page. Digital mode is a binary TTL level signal, and its
polarity can be inverted under system programming.
EXTENDING THE TALK TIME
Formats using a TALK-ENDER (PG-50) may require a longer talk time; TALK-ENDER is a
short message sent at the end of the talk time over the radio channel to mute the pager's
audio. The Model 15 uses its Channel Busy input to delay TALK-ENDER and extend the
talk time.
Connect TB1 pin 7 (Channel Busy) to TB1 pin 10 (PTT) or to COR of the receiver on the
channel. NOTE: The Channel Busy requires a logic low or closure to ground to operate
properly. This enables the encoder to know when the channel is in use.
To allow a longer voice message than the programmed Talk time, the operator presses the
PTT on the desk microphone while the TALK LED is on in the encoder display. This will
extend the Talk time for as long as the microphone PTT is held; the TALK-ENDER and
battery saver (PG-50) signals will not be sent until the microphone PTT is released. During
the extended Talk time, the “buSY” prompt will be shown in the encoder display.
If battery saver (PG-50) is enabled, the page cannot be sent until the pager wakes up. The
display will freeze until the pager wakes up, then the page will be sent.
ALPHA PAGING
For paging systems that use alphanumeric paging such as POCSAG, the encoder's optional
serial port must be used to connect to the serial port of a CRT or computer. Please note that if
a computer is used to enter alphanumeric messages through the encoder, some form of
terminal emulation software must be used on the computer to allow the computer to
communicate out through its serial port to the encoder. To simplify explanations from this
point on, the CRT or computer used with the Model 15P will simply be referred generically
to as the “terminal”.
The terminal's receive line is connected to the encoder's transmit line on TB2 pin 17. The
terminal's transmit line is connected to the encoder's receive line at TB2 pin 15. The
terminal's signal ground line is connected to TB2 pin 16 of the encoder. Select the desired
baud rate of the encoder by moving the jumper at JP14 to the appropriate location 300 to
9600.