ABB Relion 615 series, Operation Manual

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Table 22: Basic diagnostic counters
Counter Function
Characters received Counts all incoming non-erroneous characters.
This counter operates regardless of if the serial
driver is set to detect a whole protocol link frame
or just separate characters.
Frames received Counts all protocol specific non-erroneous
frames received. Protocol-specific frames can be
based on timing (for example, Modbus RTU) or
on special start and stop characters (for
example, Modbus ASCII).
Frames discarded Counts all protocol-specific erroneous frames
received. If the driver detects an error while
receiving a frame, the frame is automatically
discarded. This also means that the protocol in
question will never receive a faulty frame from
the driver. When this counter is increased, one of
the detailed error counters is also incremented.
Frames transmitted Counts all protocol-specific frames transmitted
from the COM channel.
Table 23: Detailed error counters
Counter Function
CD Lost In RS-232 handshake mode, characters are to
be received as long as Carrier Detect (CD)
signal is active. This counter is incremented if
the CD signal is lost during reception.
Collision Counts transmission collisions. Used in RS-485
mode by some protocols where transmissions
could collide. For example DNP3 unsolicited
mode.
CTS Timeout. In RS-232 handshake mode the Clear To Send
(CTS) signal is not received as reply to this
device Request To Send (RTS) signal.
Transmission timeout. In RS-232 handshake mode. If the CTS signal
goes inactive during transmission then the
transmission is halted. Transmission will be
resumed when CTS goes active again. The
whole frame transmission must anyhow be ready
within a specified time. If this timeout elapses
then this counter is incremented. Result will be
that the end of the frame is not being transmitted
out.
Parity errors Counts parity errors detected in characters.
Overrun errors Counts overrun errors detected in characters.
Framing errors Counts framing errors detected in characters
1MRS756708 C
Section 8
Commissioning
615 series 107
Operation Manual