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Hall Research URA-RS232-C User Manual

Page 5

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5

Projector Controller Programmable Serial Device

Operation

The URA-RS232 is designed to send a
string of commands to a serial device
(projector) via the serial interface, when
the discrete input transitions. When the
‘EXT CTRL’ input transitions “High-To-
Low”, the dry contact is opened, the
URA-RS232 will send the “OFF” string
to the serial device (projector) and
when the ‘EXT CTRL’ input transitions
“Low-To-High”, the dry contact is
closed, the URA-RS232 will send the
“ON” string to the serial device
(projector).
The URA-RS232 will communicate with
the serial device (projector) at some baud rate specified in the user’s manual
of the serial device (projector). The URA-RS232 programming software will
allow the user to select that baud rate for the serial device (projector). The
URA-RS232 programming software will also allow the user to upload two
strings to the URA-RS232. This will consist of the ON string and the OFF
string. These strings are limited to 100 characters in length each. These two
strings can be constructed directly in the URA-RS232 programming software.
The user will then be able to upload the baud rate and the two strings to the
URA-RS232. The URA-RS232 will, in turn, send out these strings to the
serial device (projector) when the ‘EXT CTRL’ input changes state.
The user also has the ability to include a number of waits in the string of
commands. For example the user may send out the commands ‘CCB’ and
then wish to wait for 3 seconds and then send out additional commands.

This will be explained in further detail below.