Depending on the communication protocol, the serial driver software receives single
characters or complete protocol frames, based on the frame start/stop characters or on
timing.
Monitoring data for a COM channel can be divided into basic and detailed diagnostic
counters.
Table 24: Monitoring data for a COM channel
Parameter Range Type Description
Characters
received
0…2147483646 Basic Number of separate characters received.
Frames received 0…2147483646 Basic Number of successfully received complete
frames.
Frames discarded 0…2147483646 Basic Number of frames discarded.
Frames transmitted 0…2147483646 Basic Number of frames transmitted.
CD Lost 0…2147483646 Detailed Number of carrier-detect signal lost during
receive.
Collision 0…2147483646 Detailed Number of collisions detected.
CTS Timeout 0…2147483646 Detailed Number of clear-to-send signal timeout
errors.
Transmission
timeout
0…2147483646 Detailed Number of transmission timeout errors.
Parity errors 0…2147483646 Detailed Number of character parity errors detected.
Overrun errors 0…2147483646 Detailed Number of character overrun errors detected.
Framing errors 0…2147483646 Detailed Number of character overrun errors detected.
Link status 1 1 = Reset counters (by entering 1 the
diagnostic counters are reset)
Whether all diagnostic counters are relevant depends on the communication hardware and
communication protocol.
Section 8 1MAC456939-IB D
Commissioning
124 620 series ANSI
Operation Manual
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