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8808A
Users Manual
4-14
Table 4-6. Description of Bits in ESR and ESE
Bit No. Name Condition
0 Operation Complete (OPC) All commands before receipt of an *OPC command have
been executed. Interface is ready to accept another
message.
1 Not used Always set to 0.
2 Query Error (QYE) Attempted to read data from the Meter's output buffer when
no output was present or pending.
Or received a new command line before a previous query
was read.
Or input and output buffers were full.
3 Device-Dependent Error (DDE) Incorrect input during calibration.
Or RS-232 input buffer overflow.
4 Execution Error (EXE) Command was understood but could not be executed. This
can result from a command that contained an inappropriate
parameter.
5 Command Error (CME) Command was not executed because it was not
understood. This can result from a command that contained
a syntax error.
6 Not used Always set to 0.
7 Power On Power was cycled off and on since the last time the ESR
was read or cleared.
Status Byte Register
The STB is a binary-encoded register that contains eight bits. Note that the SRE uses bits
1 through 5 and 7 to set bit 6, the Master Summary Status (MSS) bit, as enabled by the
SRE. The eight STB bits are described in Table 4-7, and are read using the *STB?
command.
Table 4-7. Description of Bits in the Status Byte Register (STB)
Bit No. Name Condition
0 Not used Always set to 0.
1 Not used Always set to 0.
2 Not used Always set to 0.
3 Not used Always set to 0.
4 Message Available (MAV) Data is available in output buffer. Bit set to 1 when
response to query placed in output buffer. Bit cleared (set to
0) when output terminator sent to host.
5 Event Status (ESB) One or more of enabled events in the Event Status Register
have occurred. To determine which events have occurred,
send command *ERR? to read the Event Status Register.
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