Model 2110 5½ Digit Multimeter Reference Manual
Appendix B: Status model
2110-901-01 Rev. C/August 2013
B-3
Clearing registers and queues
When the instrument is turned on, the bits of all registers in the status structure are cleared (reset to
0), and the queue and buffer are empty. Commands to reset the Event and Event Enable registers,
and the Error Queue, are listed in the following table. In addition to these commands, any enable
register can be reset by sending the 0 parameter value with the individual command to program the
register.
Common and SCPI commands to reset registers and clear queues
Commands
Description
Ref.
To reset registers:
Reset all bits of the following event registers to 0:
Note 1
*CLS
Standard Event Register
Questionable Data Register
*SRE 0
Clear enable registers:
*PSC 1
If command sent previously, turning on instrument power
clears the enable registers
To clear error queue:
*CLS
Clear all messages from Error Queue
Note 1
1. The Standard Event Enable Register is not reset by *CLS. Send the 0 parameter value with *ESE
to reset all bits of that enable register to 0 (see
Status byte and service request commands
B-7)). When the instrument is powered on, the Standard Event Enable Register will not be cleared if
users have set the instrument previously by using *PSC 0.
2. Querying the Standard Event and Questionable Data Registers only clears their respective
summary register bits.
Programming enable registers
The only registers that can be programmed by the user are the enable registers. All other registers in
the status structure are read-only registers. The following explains how to determine the parameter
values for the various commands used to program enable registers. The actual commands are
covered later in this section.
A command to program an event enable register is sent with a parameter value that determines the
desired state (0 or 1) of each bit in the appropriate register. An enable register can be programmed
using the decimal format.
The bit positions of the register indicate the binary parameter value and decimal equivalent.
Reading registers
Any register in the status structure can be read by using the appropriate query (?) command. The
response message is a decimal value corresponding to a binary-weighed sum of all bits set in the
register.
