User manual

64 GMC-I Messtechnik GmbH
 SRQ is also reset.
*TRG – Device Trigger Function
Functions
Triggering of functions specified with *DDT (see also page 61)
Programming
Setting command: *TRG
Example (HP Basic):
OUTPUT 713;"*TRG"
Note
If DDT memory is empty, the trigger function is considered
undefined. When the *TRG command is received, bit 4 (EXE,
execution error) is immediately set in the standard event register.
The *TRG command may not be used as part of the *DDT
command. Execution of the *TRG command does not change the
DDT register.
*TST? – Starting the Self-Test
Functions
 Command for a device self-test
 Test results are written to the output buffer as a response.
 The self-test has no effect on current device settings or stored
parameters.
 The self-test is started immediately after receipt of the
corresponding query command and has a duration of
approximately 6 seconds.
Programming
Query command: *TST?
Response string: 0 = test passed
1 = error detected
Length: 1 character, fixed
Notes:
 As long as the test is running, no data can be transmitted to the
device and manual operation is disabled.
 Do not transmit the *TST? command together with other setting and/
or query commands in a single string.
 Enter a waiting period of approximately 6 seconds between
transmission of the query command and read-out of the response
string.
 IEC bus control: Completion of the self-test can be recognize by
means of cyclical querying and evaluation of the status byte
(serial polling) (test completed —> MAV-Bit = 1).
 The self-test is not influenced by serial polling.
 If the self-test is failed, the TSTE bit is set in ERB (event register
B).
 If appropriate masking is implemented with event registers ERDE
and SRE, an SRQ message is triggered.
*WAI – Wait to Continue
Functions
The *WAI command is of no significance for programming the
KONSTANTER. It serves to synchronize the interface protocol in
accordance with the IEC 488.2 standard.
ADDRESS – Interface Addressing
Function and manual operation:
See explanation in chapter 4.7.
Programming
Setting command: ADDRESS n
Parameter: n (address number)
Parameter type: Integer (whole number)
Setting range: 0  n  30, 31 (= UNL unlist)
Example:
"ADDRESS 13"
Comments
 If the SSP KONSTANTER is operated at the serial interface only,
sub-addressing can be omitted.
 If the SSP KONSTANTER is operated at the optional IEEE488
interface, sub-addressing is ignored.
CRA? – Condition Register Query
Query
Functions
 Condition register A (see also chapter 6.3 on page 60 and the
table: “Query Commands for Status and Events Management”
on page 86).
 8 bit status register
 Current status of a certain device function at the point in time
of the query
 Direct writing and clearing is not possible.
 Example
– Output in current regulating mode (CCR):
CCR status bit 1 is set (= 1) in the CRA.
– The status bit remains set for the duration of current
regulation.
– CRA can be queried as often as desired.
– The contents of the CRA are not changed by the query.
– The current regulating mode is exited:
CCR status bit 1 is reset (= 0) in the CRA.
Programming
Query command: CRA?
Response string: n (decimal equivalent)
Value: 0 n  255
Length: 3 characters, fixed
Example (HP Basic):
OUTPUT 713; "CRA?"
ENTER 713; A$; DISP A$
 Display: 002 {002
10
= 0000 0010
2
}
(CCR, constant current regulation)