4
Execution error (EXE). An invalid parameter for a command has
been received or the command could not be executed under exist-
ing conditions.
5
Command error (CME). An unrecognized command or a command
with improper syntax has been received.
6
User request (URQ). No function for this instrument.
7
Power on (PON). Always set after the power is switched on.
The ESB bit of the Status Byte Register (Section 8.4.11.7) is set (1) whenever
any bit of the Event Status Register is set and its corresponding mask bit in the
Event Status Enable Register (Section 8.4.11.2) is set. The Event Status Regis-
ter is cleared when queried with the ESR? command or when the *CLS com-
mand is received. The response in the following example would be given after
an invalid command is received by the 1620 and no other error occurred.
Example command: *ESR?
Example response: 32
8.4.11.5
*SRE?
Returns the Service Request Enable Register. (See *SRE <num> command
below.)
Example: *SRE?
Response: 0
8.4.11.6
*SRE <num>|MIN|MAX|DEF
This command sets the Service Request Enable Register. This register deter-
mines which event bits of the Status Byte Register affect the MSS Master Sum-
mary Status message bit of the Status Byte Register. If any event bit of the
Status Byte Register is set (1) while its corresponding mask bit of the Service
Request Enable Register is set, the MSS Master Summary Status message bit of
the Status Byte Register will be set and a service request generated. The value
of the <numeric_value> parameter is a number from 0 to 255 that is the sum of
the binary-weighted values of each mask bit. The Status Byte Register is de-
scribed in section 8.4.11.7 below. The following example causes the MSS bit in
the Status Byte Register to be set and a service request to be generated when-
ever the ESB bit of the Status Byte Register is set.
Example command: *SRE 32
8.4.11.7
*STB?
This query command returns the Status Byte Register. Reading this register
does not affect it or the output queue. The value returned indicates the condi-
1620 the “DewK”
127
8 Digital Communications Interface
