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Section IV
Model DRC-93C
Table 4 - 1 1 . DRC-93C
Command/Request
Summary
for Scanner
Command
YAN1N2N3
or YBON2N3
(After YH cmmd)
YS
YH
Request
WY
Functional Description
Set the AN1 (A0
-
A4) or BO Scanner channel dwell time
time to N2N3 seconds. N2N3 is
00
to
99
seconds.
Forms
are YA000 thru YA099, YA100 thru YA199, etc.
Enable the
(S) CAN
function.
Disable, or (H)old, the
SCAN.
Functional Description
scan Information
ClrC2C3,C4C5,C6C7,C8c9,c10c11,C12C13,C14C15
22
characters plus up to
2
terminators where:
C1
is the
SCAN
status,
(H)
olding or
(S)
canning.
C2C3-C12C13 is the A0
-
A4 and B O dwell times in seconds.
c14c15
is the SCAN position A0, Al, A2, A3 or A4.
a) Ci corresponds to an alphanumeric
4 . 1 0 . 4
Holding
the Scan
Function
line low.
The BUS CONTROLLER uses
-The YH command
the serial poll
(SPOLL)
to obtain
the contents of the register in the
The Scan can be stopped any time
DRC-93C called the Status Register.
over the IEEE-488 Bus by sending
out the YH command.
The scanner
The DRC-93C Status Register is a
should be in hold when any of the
single byte of data from the DRC-93C
other scanner commands are sent to
containing
five bits called the
the scanner.
Status Reports. These StatusReports
indicate when certain processes are
4 . 1 0 . 5 T h e
"WY"
Data
S t r i n g
complete, whether the channel
w a s
changed, or a limit, overload or
This request includes whether the
error encountered. The
S t a t u s
Register
instrument is scanning or holding,
Mask is provided so that the Status
thechannel dwell informationandthe
Request
interrupt and
undesired
scan posit ion.
Status Reports can be inhibited.
Reading the Status Register resets
4 . 1 1 THE
SERVICE REQUEST,
STATUS
the Status Register to all zeros so
REGISTER,
STATUS REPORTS,
AND THE
that only new status reports will
S T A T U S
REGISTER MASK
be
registered by
the
DRC-93C.
Thus, through the SRQ management
As mentioned earlier, a Service
line and the Status Register, the
Request can be initiated by the
DRC-93C is able to signal Status
DRC-93C to indicate a function has
Reports on five conditions immedia-
been performed, or a limit, overload
tely to the
BUS
CONTROLLER.
or error has been encountered. The
DRC-93C does this by pulling its
It is possible to disable the DRC-
SRQ (Service Request) management
93C SRQ line thereby preventing the
4-18
COPYRIGHT
3/88
LSCI
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