Rigol DS7034 User Programming Manual page 31

Chapter 2 Command System
Format D15, CHAN1, CHAN2, CHAN3, CHAN4, or OFF.
Example
:BUS1:RS232:RX D0
:BUS1:RS232:RX?
:BUS<n>:RS232:POLarity
Syntax :BUS<n>:RS232:POLarity <pol>
:BUS<n>:RS232:POLarity?
Description Sets or queries the polarity of RS232 decoding.
Parameter Name
<n>
<pol>
Remarks The RS232 standard uses "Negative Logic", i.g. high level is Logic 0 and low level is

Logic 1. Therefore, when the parameter <pol> is set to NEGative, it indicates that
the polarity is set to negative logic, i.g. Normal polarity. When the parameter <pol>
is set to POSitive, it indicates that the polarity is set to positive logic, i.g. Inverted
polarity.
In the RS232 decoding, the start bit of data packet indicates when to start data

transmission. It is determined by the polarity. When <pol> is set to "POSitive", the
start bit is 0; when "NEGative", the start bit is 1.
Return
The query returns POS or NEG.
Format
Example :BUS1:RS232:POLarity POSitive
:BUS1:RS232:POLarity?
:BUS<n>:RS232:ENDian
Syntax :BUS<n>:RS232:ENDian <endian>
:BUS<n>:RS232:ENDian?
Description
Sets or queries the endian of data transmission in RS232 decoding.
Parameter
Name
<n>
<endian>
Remarks LSB: indicates Least Significant Bit transmission sequence, i.g. the lowest bit of the

data is transmitted first.
MSB: indicates Most Significant Bit transmission sequence, i.g. the highest bit of the

data is transmitted first.
Return
The query returns LSB or MSB.
Format
Example :BUS1:RS232:ENDian MSB /*Sets the transmission order of RS232 decoding to MSB.*/
:BUS1:RS232:ENDian?
MSO7000/DS7000 Programming Guide
/*Sets the RX channel source of RS232 decoding to D0.*/
/*The query returns D0.*/
Type Range
Discrete {1|2|3|4}
Discrete {POSitive|NEGative}
Type Range
Discrete {1|2|3|4}
Discrete {MSB|LSB}
/*The query returns MSB.*/
/*Sets the polarity of RS232 decoding toPOSitive.*/
/*The query returns POS.*/
RIGOL
Default
——
NEGative
Default
——
LSB
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