8 Serial Line Monitor
8 - 2
NX-series Communications Interface Units User’s Manual (W540)
8-1 How the Serial Line Monitor Works
"Monitor" in the serial line monitor means to store a log of the data that is sent and received by the CIF
Unit in a buffer inside the CIF Unit. The data stored in this buffer is called the monitor data.
You can check the monitor data to see when and which data was sent and received. You can use this to
co
nfirm whether data is sent and received according to the system design.
You can use the serial line monitor to start and stop monitoring and to display monitor data on the Sup-
port Software.
There is a different buffer for each port. You can ther
efor
e monitor the line data and display the monitor
data for a specific port.
The contents of the monitor data are given in the following table.
Precautions for Correct Use
The monitor data is not included in the Support Software project. To save the monitor data, use
the monitor data export operation and save it in a separate file from the Support Software proj
-
ect file.
8-1-1 Monitor Data Contents
Category Data Description
Sent or received
messages
SD Sent message
RD Rece
ived message
Control signals RS Request to send
CS Clear to send
ER Data terminal ready
DR Data set ready
Communications
error flags
Parity Error Flag These flags indicate when errors occur.
Framing Error Flag
Overrun Error Flag
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