System information

G2T Programmers Guide Rev-A 17-Nov-2014

6.1.8. Commands to Evaluate and Control Status (488.2)

The following commands are used to evaluate and control the

status of the device. Unless noted, these commands are part of

the IEEE 488.2 standard command set. Recall that each interface

maintains its own set of registers (but share the Fault Queue).

*STB? – returns the value of the SBR at the start of the

command. Note that the effect of the command on MAV

won’t be visible until after the command is executed. The

most effective place for this command is as the last

command of a compound command. Bits 7, 2, 1 and 0 are

not used by this device at this time. Host programs should

mask them out.

*SRE n – n is an integer value between 0 and 255. N is

“anded” with 00111000 and set in the SRER. This

corresponds to the bits that are in use in SBR. If at least one

bit is set in SRER and its corresponding bit in SBR is also set

then the MSS bit in SBR is set. Each time the SRER is

changed (by this command), the value of MSS is re-

evaluated.

*SRE? – returns the value of the SRER as an integer between

0 and 255. Note that any unused bits are mapped out

whenever a value is set in SRER. To illustrate the following

command: SRE 255;SRE? Returns 56.

*ESR? – returns the value of the ESR as an integer between

0 and 255. Per 488.2, the reading of the ESR clears it.

*ESE? – returns the current value of the ESER as an integer

between 0 and 255. The value of ESER does not change.

*ESE n – sets the integer value n (between 0 and 255) into

ESER. If at least one of the bits in ESER is set at the same

time as its corresponding bit in ESR, then the ESB bit in SBR is

also set. Each time ESER is changed (by this command),

the value of ESB and MSS are re-evaluated.

*PSC n – sets the integer value n (0 or 1) in the PSC register.

If the register is 1, ESER and SRER are cleared on each

restart. If its value is zero, ESER and SRER are preserved. One

possible use of this feature is that by setting the PON bit in

ESER, setting the ESB bit in SRER and setting 0 in PSC, the

device requests service from its controller on power-up.

(This works only on GPIB.)