Larson Davis System 824, Справочное руководство

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B-4 824 Reference Manual 9/12/00
Command Description
0 Address 0 ($80), Broadcast, will enable addressing of all 824s on the net in a
broadcast receive mode. Only the 824 with address 1 will respond; all will
receive the command.
127 Address 127 ($FF), Address All, will enable all 824s to receive and respond to
commands; in other words it will disable the addressing feature of all 824s on
the net. Useful when only one device is connected.
126 Address 126 ($FE), Disable All, will disable all 824s and none will respond to
commands received. This is useful when trying to communicate with one
device on the net that has addressing disabled by having its address set to zero.
125 Address 125 ($FD), Lock, will lock the current addressing of all 824s on the net
so that binary setting data may be sent to the currently addressed 824. To cancel
the lock so that addressing may be changed a <break> is sent.
124 Address 124 ($FC), Auto ID, will initiate an Auto-Identification of all 824s on
the net using a timing scheme based on each unit's address. The data received
will be the address byte from every device on the net delayed by 10mS times the
address; thus it will take a maximum of 1 second to receive the byte from unit
100.
<break> A short break will cancel the addressing lock initiated with the 125 address com-
mand, so that addressing may be changed.
<break>
<break> Two breaks in a row will re-initialize the I/O and Printer tasks and the clear the
data and command buffers. It will also address all instruments (first command
should be an address).
<break>
<break>
<break> Three breaks in a row will cause all 824s on the network to temporarily change
to 9600 baud to ensure that all devices on the net can be communicated with.
Note: The baud rate is not changed if in modem mode and connected. These
should be “Long” breaks (>50ms) to accommodate a unit set at 300 bps. Use the
S2283, n command to temporarily set the I/O baud rate where ‘n’ indicates the
new rate (see pg. B-30)