4. ADDRESSING A MESSAGE
Any message to System
21
is of course preceded by the IEEE/IEC address set on
the master unit.
Example:
IEC PRINT #11,"message"
or
OUTPUT
711;
"message"
using P2000C
using HP85
sends the "message"
to
System
21
with IEEE/IEC address
11.
The routing of this message (to the master or to one of the slave units) is indicated
by the first
element of the message, the "unit address".
This unit address is:
"AID"
for the master (Additional Instrumentation Devices).
"AID" +3digits for the slave units.
These 3 digits consist of the
last two digits of the type number of the unit + 1 digit
set on the unit address switch.
Separation between unit address and the following commands is
" ;" or
",
".
If more
than one command is sent in one string, the
individual commands have to be
separated by commas.
Examples:
Message
Description
"AID;command"
routes a "
command"
to the master routes
the
two
''AID203;command,command'' commands to the unit
PM2120 with address switch
set to 3
5
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