1269 User Manual
Using The Enhanced Monitoring System 4-29
Each of these messages will be flashed on the display. If
more than one out-of-tolerance condition is detected, each
status message will be displayed in a round-robin fashion.
Programming The RS-
232 Interface
The EMS includes an RS-232 interface which may be used
to send commands and receive replies. The RS-232
interface operates at one of four baud rates: 1200, 2400,
4800, or 9600. It supports 7 or 8 data bits, even, odd, or no
parity, and 1 or 2 stop bits.
The default baud rate, data bits, stop bits, and parity are
selected using DIP switch SW1. These settings will be
used upon power on or upon reset. Consult the
configuration diagram in section 2 of this manual for switch
settings of SW1.
The baud rate, data bits, stop bits, and parity may be
programmed using commands over the VXIbus or over the
RS-232 interface.
Programming The Baud
Rate
The baud rate may be programmed using the command:
SYSTEM:COMM:SERIAL:BAUD <baud rate>
where “<baud rate>” will be one of the following: 1200,
2400, 4800 or 9600. The present baud rate may be read
back using the query
SYSTEM:COMM:SERIAL:BAUD?
The EMS will reply with one of the four possible values.
Programming The
Number of Data Bits
The number of data bits may be programmed with the
command:
SYSTEM:COMM:SERIAL:BITS <data bits>
where “<data bits>” will either be 7 or 8. The presently
programmed number of data bits may be read with the
query:
SYSTEM:COMM:SERIAL:BITS?
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