9/29/09 A-5
‘Daisy Chain Addressing
The following instruments are
compatible on a common network:
Models 712, 720, 812, 814, 824, 870,
and TAC100. Future instruments
may also be compatible with this
network.
A network of instruments may be
interconnected to one computer
using the appropriate cabling, and
each may be controlled individually.
Each is given a unique address. By
default, all 824s are given an address
based on their serial number from 1
to 100. Serial numbers that end with
two zeros will be addressed as 100.
The addresses are sent as a single
byte ranging in value from 129 to
228 representing address 1 to 100
respectively (address plus 128),
while addresses 101 through 127 are
reserved. At power-on all 824s are
address enabled (as if they had just
received their address). Whenever an
address byte is received, only the
corresponding instrument is enabled
to receive and respond to commands.
A broadcast command can be sent.
By sending an address of zero,
CHR$(128), all units on the chain
will become addressed and accept
the commands that follow. Only the
device with an address of 1 will
respond to the commands. This will
allow all units to be started at the
same moment, or to have the same
setting sent to all devices with one
command, i.e. set all clocks to the
current time.
To Next Page
Loading...
Need help?
General
