KTA-282 Modbus TCP Weather Station Gateway
Red Tx LED (next to RS-485 terminal)
Indicates serial communications received on RS-485
Green Rx LED (next to RS-485 terminal)
Indicates serial communications sent (Modbus RTU) on
RS-485
Green Rx LED next to DE-9 connector
Indicates serial communications received (from weather
station) on the serial port
Red Tx LED next to DE-9 connector
Indicates serial communications sent on the serial port
Green LED (right side) on RJ45 socket
Link LED. Always on to indicate good status for
Ethernet, flashes to indicate activity.
Yellow LED (left side) on RJ45 socket
FDX LED.
On = Full duplex Ethernet
Off = Half duplex Ethernet
Green Rx LED next to RJ45 socket
Flashes when packets are received on the Ethernet port.
Red Tx LED next to RJ45 socket
Flashes when packets are sent on the Ethernet port.
Table 3: KTA-282 LED Functions
Provide power to the KTA-282 via the V+ and GND screw terminals. Without anything else connected, you should
see the red LED next to the DE-9 connector flash once every 5 seconds. This confirms the card is on and
functional.
Continue by connecting the DE-9 cable from your weather station (via the WeatherLink) to the male D9 port of the
KTA-282. You should now see an accompanying green light every time the red LED flashes. This indicates the card
is successfully receiving data from the weather station.
Configuring Modbus
Modbus RTU
Serial Modbus is provided on RS-485. The communications settings for this port are set using 8 DIP switches next
to the DE-9 Socket. Any changes to the switches won’t take effect until the KTA-282 is power cycled.
Modbus RTU
Address
Switch 1
Switch 2
Switch 3
Switch 4
1
OFF
OFF
OFF
OFF
2
ON
OFF
OFF
OFF
3
OFF
ON
OFF
OFF
4
ON
ON
OFF
OFF
5
OFF
OFF
ON
OFF
6
ON
OFF
ON
OFF
7
OFF
ON
ON
OFF
8
ON
ON
ON
OFF
9
OFF
OFF
OFF
ON
10
ON
OFF
OFF
ON
11
OFF
ON
OFF
ON
12
ON
ON
OFF
ON
13
OFF
OFF
ON
ON
14
ON
OFF
ON
ON
15
OFF
ON
ON
ON
16
ON
ON
ON
ON
Table 4: Modbus RTU address switches
Baud Rate
Switch 5
Switch 6
2400
OFF
OFF
4800
ON
OFF
9600
OFF
ON
19200
ON
ON
Table 5: Modbus RTU Baud Rate switches
7/05/2013
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