HP E8402A, User And Service Manual, Page: 136 / 249

138 Programming the Enhanced Monitor Chapter 3
SYSTem:COMMunicate:SERial[:RECeive]:BITS < bits >
SYSTem:COMMunicate:SERial[:RECeive]:BITS?
SYSTem:COMMunicate:SERial[:RECeive]:BITS sets the number of bits used to
transmit and receive data. Valid parameters are 7, 8, MIN, MAX, and DEF. Default
is 8.
SYSTem:COMMunicate:SERial[:RECeive]:BITS? returns an integer representing
the number of bits for RS-232 communication.
Parameters
Returned Data
Comments
•
When used with :BITS, the MIN parameter sets the number of data bits to the
minimum value, 7. When used with :BITS? it returns the minimum value of 7
but does not change the actual number of data bits used. Likewise, MAX sets
or returns the maximum number of bits (8), and DEF sets/returns the default
number of data bits, 8.
•
While this command operates independently of either the ...PARity <type> and
...SBITs commands, there are combinations which are not allowed because of
their data frame bit width. The following table shows the possible
combinations:
Error Conditions
The following table lists the most common error conditions and causes. Error
numbers and corresponding messages can be found using
SYSTem:ERRor? query.
Reset Condition
*RST resets Bits to the last value saved by the SYST:NVS command.
Name Type Range of Values Default Description
< bits> numeric
enum. 7, 8
MIN|MAX|DEF 8 Bits for RS-232 communications.
Type Range Description
int16 7, 8 Bits for RS-232 communications.
...BITS ...PARity < type> ...SBITs Frame Bits
7 NONE 1 disallowed
7 NONE 2 10
7 ODD/EVEN 1 10
7 ODD/EVEN 2 11
8 NONE 1 10
8 NONE 2 11
8 ODD/EVEN 1 11
8 ODD/EVEN 2 disallowed
Number Message Probable Cause
-222 “Data out of range” You tried to set a disallowed combination of Bits,
Parity, and Stop Bits.