8611/SM SIGNAL MONITOR OPTION
A-8
APPENDIX A
determined by an operator by sending the *OPT? query. See
Table 4-2
for
details.
The 8611/SM is designed so that upon initialization the WJ-9168 is placed in
a termination mode that causes all of its response messages to be terminated
with FD
H
. The WJ-8611 passes the FD
H
termination with the message to the
controller. When sending signal monitor messages from the controller,
terminate them with FD
H
. The WJ-9168 responds to all received messages. In
order to prevent bus conflicts, the WJ-8611 waits for the completion of the
WJ-9168 message or the expiration of an internal timer before accepting
another signal monitor message. The initial timer is initiated upon the passing
of a message to the WJ-9168 and expires after 8 seconds.
The WJ-8611 does not report the status of the 8611/SM through its status
reporting architecture. To check the status of the WJ-9168, send the Built-In
Test command A9
H
. See
Table A-3
.
A.9.2 COMMAND FORMAT
Each of the binary commands that control the WJ-9168 is one byte long. All
command bytes used in IEEE-488 applications are followed by data parameter
bytes. The following list describes the basic command format.
•
The MSB of each command equals 1 (all commands have their
MSNibble = "A
H
"; binary "1010").
•
All data parameter fields have an MSB = 0.
•
There is always a command terminator FD
H
.
•
The WJ-9168 acknowledges all commands with either an ACK
(06
H
) or a NACK (15
H
) character after the command and any
associated data has been received. All responses are terminated
with FD
H
.
•
The WJ-9168 will always generate a NACK response to a
command with an out-of-range parameter.
•
Invalid command bytes are ignored by the WJ-9168 with one
exception. The unit will generate a NACK response to a
communications error (noise or frame). This condition does not
create a problem since the WJ-9168 is the only device on the
WJ-8611’s internal network.
•
The WJ-9168 provides query command responses (such as BIT)
after the ACK acknowledge.
Courtesy of http://BlackRadios.terryo.org
Summary of Contents for WJ-8611
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