Commodore Plus 4 - Page 222

MODES
I 7 | | 6
I 5 | | 4
I 2
(Machine lang —rsstat)
PARITY ERROR BIT
FRAMING ERROR BIT
RECEIVER BUFFER OVERRUN BIT
UNUSED BIT
CTS SIGNAL MISSING BIT
UNUSED BIT
DSR SIGNAL MISSING BIT
BREAK DETECTED BIT
Figure A-3 RS-232 Status Register
NOTES
If the B!T=0, then no error has been detected.
The RS-232 status register can be read from BASIC using the variable
ST.
If ST is read by BASIC or by using the KERNAL READST routine the
RS-232 status word is cleared upon exit. If multiple uses of the STATUS
word are necessary, the ST should be assigned to another variable, i.e.
SR=ST: REM ASSIGNS ST TO SR
The RS-232 status is read {and cleared} only when the RS-232 channel
was the last external I/O used.
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