HP 6038A Service Manual

The mask register is maintained by the user, and is used to
specify which bits in the status register are enabled (un¬
masked) to set bits in the fault register. A bit is set in the fault
register when the corresponding bit in the status register
changes from 0 to 1 and the corresponding bit in the mask
register is 1. Whenever any bit is set in the fault register the
FAU bit is set in the serial poll register.
3-169 Note that bits can beset in the fault register only when
there Is a change in either the status register or the mask
register. Therefore, if a bit is set in the mask register (unmask¬
ed) after the corresponding condition becomes true in the status
register, the associated bit will also be set In the fault register.
3-170 Bits may be set in the mask register (conditions un¬
masked) in either of two ways. The UNMASK command may
be followed by mnemonics which specify which conditions are
unmasked (enabled to set bits in the fault register), or the UN¬
MASK command may be followed by a decimal number that
is the sum of the weights of the bits to be set. The mnemonics
and bit weights are the same as in Table 3-9. The mnemonic
NONE or decimal number 0 will clear all bits in the mask register.
3-171 Bits are set in the mask register with either of the
following codes {ERR/128, OR/4, and CC/2 used as examples):
UNMASK CC, OR, ERR
or
UNMASK 134
3-172 Mnemonics may be sent in any order, and they must
be separated by commas. Note that the mask register does not
affect the status register, it simply determines which bits in the
status register can set bits in the fault register.
3-173 The mask register may be read by sending:
UNMASK?
and addressing the power supply to talk. The response from
the power supply will be in this format (using 134 as an
example):
UNMASK 134
3-174 The fault register may be read by sending:
FAULT?
and addressing the power supply to talk. The response from
the power supply will be In this format (using 134 as an
example);
FAULT 134
3-175 The fault register is cleared immediately after it is read
by the FAULT? query.
3-176 Service Request. In some applications it may be
desirable to interrupt the controller when a power supply fault
condition occurs. The power supply interrupts the controller
by asserting the service request (SRQ) line on the HP-IB. The
ability to generate service requests for fault conditions can be
turned on and off using the following commands:
SRQ OFF or SRQ 0
SRQ ON or SRQ 1
3-177 The service request function allows use of either poll¬
ing or interrupt programming. With SRQ on, the SRQ line will
be asserted true whenever the FAU bit In the serial poll register
changes from 0 to 1. Therefore, the mask register, in addition
to specifying which conditions set the FAU bit, also determines
which conditions can generate service requests. Use of the
FAULT? query will tell the user which condition caused the ser¬
vice request (except for PON).
3-178 The state of the service request on/off function may
be read by sending:
SRQ?
and addressing the power supply to talk. The response from
the power supply is in this format:
SRQ 0 or SRQ 1
in which 0 indicates that service request capability is disabled,
and 1 indicates it is enabled.
3-179 Note that service request capability for power on is
controlled by the rear-panel PON SRQ switch, the setting of
which will not be indicated in response to an SRQ? query.
3-180 Clear. The power supply can be returned to its
power-on state with the command:
CLR
or by sending a device clear interface command. Clear is typical¬
ly used to initialize the power supply to a known state at the
beginning of a program. Clear also resets the PON bit in the
serial poll register.
3-181 The clear command does not complete until the
power supply control circuits have had time to settle. This
prevents perturbations on the power supply output, regardless
of the state before the clear command was sent. The clear com¬
mand takes about 500 ms to execute.
3-182 Note that stored preset states (as many as 16) are
not changed by the clear command.
3-183 Error. When the power supply detects a remote pro¬
gramming error it sets the ERR bit in the status register, which
can be unmasked to request service, and it turns on the front-
panel ERROR indicator. Programming errors are usually the
result of misspelled words or forgotten separators. When the
power supply detects a programming error it dumps whatever
portion of the command it has received and ignores all further
characters until a terminator is received.
3-23

HP 6038A Specifications

General

Brand	HP
Model	6038A
Category	Inverter
Language	English