8.4.2.1 Serial communication ports and drivers
The protection relay can be equipped with one UART-based serial communication
port. The communication port is a galvanic (RS-485, RS-232) port.
The serial port is called COM1. The COM port driver has its own setting
parameters found via the LHMI in Configuration/Communication/COM1.
Table 23: COM port parameters
Parameter Values (Range) Unit Step Default Description
Baudrate 1=300
2=600
3=1200
4=2400
5=4800
6=9600
1)
7=19200
1)
8=38400
9=57600
10=115200
6=9600 Baudrate
Serial mode 1=RS485 2Wire 1=RS485 2Wire Serial mode
Reset counters 0=False
1=True
0=False Resets counters
1) Recommended baud rate for optimum performance
8.4.2.2 Serial link diagnostics and monitoring
Serial communication diagnostics and monitoring is divided between the serial link
driver and the serial communication protocol. The lower level physical and
protocol-independent aspects of the UART-based serial communication are
monitored in the serial link driver. Diagnostic counters and monitoring values are
found via the LHMI in Monitoring/Communication/COM1.
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 COM channel
Parameter or counter
Description
LNKxLIV TRUE whenever characters are received on the
serial interface
CHxLIV TRUE while complete link frames are received
Characters received Counts all incoming non-erroneous characters.
This counter operates regardless of whether the
serial driver is set to detect a whole protocol link
frame or just separate characters.
Table continues on next page
2NGA000823 A Section 8
Commissioning
REX610 73
Operation Manual
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