User`s manual

360
(2) During monitoring
(a) After monitoring starts, data of reception, transmission, receiving error, and signal
change are stored from the head address of the monitor data area in the order of
occurrence.
(b) When the monitoring data exceeds the capacity of the monitor data area, monitoring
is continued by writing new data over the oldest data.
However, monitoring may automatically stop according to the settings of the monitor option area (Address:
2019H/2119H). ( Page 363, Section 16.2 (2) (a))
(c) Each data is stored in the monitor data area using the following timing.
Data classification Data storage timing
Received data When receiving data
Transmitted data When transmitting data
Receiving error data When detecting receiving errors
RS-232
line
RS (RTS), ER (DTR) signals When changing the RS (RTS), ER (DTR) signals
CS (CTS), DR (DSR), CD
(DCD) signals
When signal changes are detected during the periodic processing (Operation interval: 1 to
19ms) as well as for the above timing (Monitoring is not performed during the periodic
processing)
2600H
2601H
32FFH
0003H
0CFEH
2602H
2603H
2604H
2605H
2606H
+0
+1
+2
+3
Monitor data pointer storage area
Monitor data size storage area
Buffer memory
Monitor data area
Oldest data
(Default value)
(CH1)
to