Philips System 21 - Page 24

Requested data
Command data
Description
Response data
•
Slave-status
" S ?"
Ask for the status of the unit.
Response:
" S "+ <9 digits>
A non-zero digit represents one of
the messages given
below. A zero
digit means that the message
belonging to the position of the
digit
in the string, is not true.
Digits:
"1" Power-on reset or power fail.
(flags)
"2"
Alarm
(not applicable to all units).
This event
can only be masked by
the
" MSR ''command (" MSR 128 ")
but this masks all System 21
events.
"3"
Illegal
code received (programming
error).
"4"
Functional commands are
cancelled because of
an illegal
command sequence.
"5"
Data available; unit should be read.
"6" Busy with a block or a scan.
"7"
Warning 1 J
"8" Warning 2 specified per unit
"9"
Warning 3
The message -
flags, except digits
"5" and "6 ", are reset after
"S ?" with the next IEEE/IEC-bus
input.
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