Tektronix DMM4020 Digital-Multimeter, DMM, VFD-Multiple segment, 20000 counts CAT II 600 V DMM4020-A1 Ficha De Dados

4-14 

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. 

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. 

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.