And Q Response; Lam Lines; Srq Generation - LeCroy 8901A Operator's Manual

Theory of Operation
side-panel jumpers. The data is latched in the 890lA on every
CAMAC cycle and generally read out immediately after the cy
cle completes. However, a special command (F(0), A(0),
N(24)) is provided to allow readout of the latched data (the
CAMAC cycle is inhibited) at a later time.
X AND Q RESPONSE The X and Q responses are latched in the 8901A during the
CAMAC cycle and read out in the response byte. They are
also used in the generation of SRQ's and termination of block
mode transfers.
LAM LINES
The LAM lines are used by the SRQ generation circuit and can
be read by the GPIB controller when it's conducting a serial
poll.
SRQ GENERATION
A service request (SRQ) may be generated (depending on how
the 8901A is programmed) on any of the following conditions: a
LAM is set by one of the CAMAC instruments, or a X = 0 or
Q =0 response is detected during the execution of a CAMAC
cycle. \^en a service request is pending, CAMAC cycles are
inhibited until a serial poll is performed and the SRQ cleared.
However, if the SRQ was caused by a LAM, unless the LAM is
cleared or the 8901A is disabled to generate SRQ's on LAM
before the serial poll is taken, another SRQ will be issued imme
diately.
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