User's Manual

SmartAlert 8214/8205 Programming/Installation Guide 320124E Page 4
Receive Frequency
The receive frequency is the center frequency measured in millions of cycles per
second that a pager is tuned to. A single frequency may typically supports
hundreds of thousands of pagers and it is the Cap Code that allows specific
identification of an individual pager. For a pager to operate, the frequency of the
transmitter (SmartAlert RS232) must match the receive frequency of the pager.
Radio Frequency (RF) Baud Rate vs. RS-232 Baud Rate
JTECH equipment, which connects via an RS-232 connection, communicates
between the host and the hardware at 1200 baud.
The term “baud rate” has also been associated with the frequency at which radio
waves designating “1’s” and “0’s” arrive at a pager (see page 3.) This RF baud
rate is often confused with the baud rate of “1’s” and “0’s” arriving at the
transmitting equipment from the host. Typical RF baud rates are 512, 1200 and
2400. JTECH supports 512, 1200 and 2400 baud pagers.
Data Inversion
Radio data sent to pagers may be sent either right side up (non-inverted) or
upside down (inverted). It is not clear where this option originated, but it
nevertheless persists. Most commercially available pagers have the option of
accepting either orientation, however, the pager supplier usually sets this option
and therefore either non-inverted or inverted data must be received, but not both.
This pager option is not usually field selectable and must be “downloaded” to the
pager via special equipment available from most paging dealers. Data non-
inverted is the most common data orientation. JTECH uses a specific descriptor
in the paging format used to “Talk” to its transmitters to allow the user to select
either a non-inverted or inverted data format. (This option is only available when
using 7-digit extended protocol.)
Priority Message
Some pagers support an option that allows the sender to indicate a “High Priority” page.
These types of pages usually cause a vibration pager to “Beep” indicating a high priority
message has been received. Ordinary priority messages sent to vibration pagers cause
the pager to simply vibrate. This pager option is not usually field selectable and must be
“downloaded” to the pager via special equipment available from most paging dealers.
JTECH uses a specific descriptor in the paging format used to “Talk” to its transmitters
to allow the user to select either a normal priority or high priority message.