T.E.M. A07B500S Manual page 32

A07B500S manual
All SLAVES are connected via the rear serial port RS485 with one single loop that crosses all the
DB9 connectors entering and exiting the transmitter, as happens with measuring instruments
connected with the IE488; as such, each one has a male DB9 and a female DB9.
The joker transmitter is also included in the loop.
The joker' s rear IN/OUT exit must be connected to the antenna and the audio frequency switching system.
Once the connection is terminated, the operating parameters of each TX SLAVE must be programmed, and
the data must be entered on the page: "N+1 system setting".
No parameter settings are necessary for the MASTER except entering data on the N+1 page.
When the global system is turned on, each SLAVE transmitter operates on its own program, while the
MASTER remains in stand-by, memorizing, via cyclical interrogation on the RS485 ports, the data for each
SLAVE transmitter.
Once storage of the various transmitter settings is complete, a cyclical check is continued to ensure that no
alarms are detected which could be caused by a failure. In the event of a failure (negative response to OK, or
no response at all), the MASTER sets itself to the parameters of the transmitter with the failure and, using its
IN/OUT port, commands switching of the antenna and audio frequency, then supplying the RF power.
If the alarm from the transmitter with the failure ceases sounding, the transmitter will not take over control of
the antenna; the joker will continue to remain active until a technician intervenes to repair the failure and re-
start the system.
If the alarm is detected on more than one transmitter, the joker will substitute the transmitter with the lowest
assigned number on the N+1 page – the most important one.
A particular case, which is more simple, is the condition N=1. This is when the system is
1+1; switching of the antenna, and especially the audio frequency, is much simpler.
The two transmitters, MASTER and SLAVE, operate on the same frequency with identical parameters,
therefore saving the serial connection with the RS485 for the communication of data settings; the serial
connection can then be used for remote connection with a modem.
Creating a connection such as the one in FIG.65 is therefore sufficient as well as contacting the factory for
getting the UNOP1 software.
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