1261B User Manual
Using The Enhanced Monitoring System 4-36
Racal Instruments
Ó
1995
Illegal RS-232
Interface
Combinations
The following combinations of parity, data bits, and stop bits are
NOT supported
No parity, 7 data bits, 1 stop bit
Even parity, 8 data bits, 2 stop bits
Odd parity, 8 data bits, 2 stop bits
If an attempt is made to program one of these combinations, the
command will be ignored, and an error will be generated and
placed in the instrument’s “error queue”. The error generated
will be error number -221 (“Settings conflict”). Consult the SCPI
reference section of this manual for a complete description of
error messages.
As an example, suppose that the system presently has the
following RS-232 configuration:
9600
baud
1 stop bit
no
parity
8 data bits
Suppose also that the following configuration is desired:
9600
baud
1 stop bit
even
parity
7 data bits
Then the parity must be programmed BEFORE the number of
data bits is programmed. If an attempt is made to program the
number of data bits to 7 before the parity is set to even, then an
illegal combination would (temporarily) result. That is, the
combination would be:
9600 baud, 1 stop bit, no parity, 7 data bits
which is NOT allowed. Thus, the commands must be sent in the
following order:
SYSTEM:COMM:SERIAL:PARITY EVEN
SYSTEM:COMM:SERIAL:BITS 7
Note that the order of programming will have to change based
upon what the present configuration is and what the desired
configuration is. That is, if we go from:
9600 baud, 1 stop bit, even parity, 7 data bits
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