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KTA-282 Modbus TCP Weather Station Gateway

Parity

Switch 7

Switch 8

None

OFF

OFF

Even

ON

OFF

Odd

OFF

ON

Bootloader

1

ON

ON

Table 6: Modbus RTU Parity switches

Notes: 

1. The bootloader is an advanced function that allows firmware updates to be deployed in the field. 

Modbus TCP/IP & Ethernet Webserver

To communicate over a TCP/IP network, the KTA-282 needs five pieces of information:

1. The Internet Protocol (IP) address of the KTA-282 within the network. Set by the user

2. The Subnet Mask of the network. Set by the user

3. The Default Gateway of the network. Set by the user.

4. A unique MAC address. Shipped preloaded by Ocean Controls.

5.

The TCP/IP port the request is being sent on. For the KTA-282, 

Modbus TCP/IP is on port 502

, and the 

webserver (HTTP) is on port 80

.

These settings themselves can be set by one of three available methods:

1. 8 DIP switches next to the Ethernet Connector

2. Modbus registers (using either Modbus RTU on RS485 or Modbus TCP/IP on Ethernet)

3. The webpage.

Configuration Using Switches

Switch one determines where the TCP/IP settings are loaded from when power is applied to the KTA-282. With this
switch off, settings are loaded from the current values of the switches, 

regardless of previous settings

. With the 

switch on, the settings are loaded from internal memory - saved after being previously configured via the webpage 
or Modbus.

Power Up Configuration

Switch 1

OFF

TCP/IP settings from switches

ON

TCP/IP settings from internal persistent memory

Table 7: TCP/IP mode switch

Switch two is the “panic switch”, returning the KTA-282 to default if the user writes incorrect values or doesn’t 
otherwise know what settings the card currently possesses. To use, flick the switch on, hold for one second, and 
turn back off again. 

Don’t leave this switch on; the card will be constantly resetting and therefore 

unresponsive. 

Default Values

IP Address: 192.168.1.100

Subnet Mask: 255.255.255.0

Default Gateway: 192.168.1.1

Reset to Default

Switch 2

OFF

No action

ON

TCP/IP settings reset to default

Table 8: TCP/IP Reset Switch

Switches three and four choose between four different TCP/IP schemes commonly used in private address space. 

TCP/IP Base Settings

Switch 3

Switch 4

IP Address: 192.168.1.x

OFF

OFF

7/05/2013

www.oceancontrols.com.au

Page 6 of 25

Содержание KTA-282

Страница 1: ...ddition of Ethernet o Allows the KTA 282 to be polled by up to three Modbus TCP IP masters simultaneously o Provides a webpage whereby TCP IP settings can be easily monitored and altered Also shows cu...

Страница 2: ...command 13 Modbus TCP Manual Socket Severing 13 Webpage 13 XML Request 14 Open Collector Outputs PCB Rev 5 and later 16 KTA 282 PC Application 17 Configuring Communications 17 Serial Switch Settings...

Страница 3: ...use latitude longitude elevation etc Table 1 Davis Instruments Jargon Weather Station Set Up Begin by assembling your weather station and sensors using the documentation provided by Davis You will nee...

Страница 4: ...Description Vs Power Positive 8 to 28V DC 100mW COM Power Negative Ground D RS 485 Data D RS 485 Data GND Ground Male DE 9 Serial communications RS 232 between KTA 282 and Weather station via WeatherL...

Страница 5: ...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 t...

Страница 6: ...re the TCP IP settings are loaded from when power is applied to the KTA 282 With this switch off settings are loaded from the current values of the switches regardless of previous settings With the sw...

Страница 7: ...b browser to the IP Address of the KTA 282 to retrieve this page Below the current weather readings is a web form with provision to set the TCP IP settings of the KTA 282 The form fields will be popul...

Страница 8: ...Location in the archive memory where the next data packet will be written This can be monitored to detect when a new record is created 4 1 Barometer 0 001 inHg 5 1 Inside Temperature 0 1 F 6 1 Inside...

Страница 9: ...ther an estimation based on temperature and dewpoint Use as an indication only Loop 2 Data Only recent Davis Instruments hardware Vantage Pro 2 firmware V1 9 or later Vantage Vue will return the loop...

Страница 10: ...e to the latest firmware at oceancontrols com au The units of the readings can be changed by writing to the Modbus holding registers shown in table 16 The following table shows the multiplier and unit...

Страница 11: ...ocol Docs on the Ocean Controls website Each argument of these commands is coupled to a Modbus register Any weather station EEPROM can therefore be written using Modbus communications The BAR command...

Страница 12: ...hange to a 1 upon EEPROM write success This completes setting the latitude of the Davis weather station Note consult the EEPROM configuration settings section of Vantage Serial Protocol Docs on the Oc...

Страница 13: ...ngs will load from dynamic value This text will read either switches or memory based on the status of TCP switch 1 It is important to realise that the TCP IP settings may still be read from the switch...

Страница 14: ...ml Using a web browser with the gateway at its default address 192 168 1 100 registers xml Figure 4 Complete register listing HTTP request using browser Error Request If the GET request is of the wron...

Страница 15: ...urn On or Off 119 1 Direction Sets the direction of the switching behaviour 0 output active below setpoint 1 output active above set point 120 2 Register Sets the Holding Register containing the weath...

Страница 16: ...communications statuses o Modbus RTU over RS485 o Modbus TCP IP o Communications with the weather station Two buttons named bind all comms and release all comms These controls are designed mainly for...

Страница 17: ...d units using the dropdown boxes and commit the selections to the gateway using the Write to KTA 282 button Writes holding registers 105 to 108 Change TCP IP Settings Displays a screen that allows the...

Страница 18: ...port It should flash red roughly once every 5 seconds If so move to step 3 If not 1 Check the wires of the power supply are the correct way around 2 Probe the power terminals with a multimeter to ens...

Страница 19: ...twork to ensure the KTA 282 has a unique IP address within the subnet The best way to do this is via your router if applicable Otherwise you could power off the gateway and then send a ping request to...

Страница 20: ...nd go to properties 3 4 Click on Internet Protocol TCP IP and go to properties 3 5 Click on use the following IP address and set the values to IP Address 192 168 1 1 Subnet Mask 255 255 255 0 Default...

Страница 21: ...Extra Humidities 1 24 1 Rain Rate 0 01 Inches hour 25 1 UV Index 1 26 1 Solar Radiation 1 W m2 27 1 Storm Rain 0 01 Inches 28 1 Current Date Of Storm Rain 1 29 1 Day Rain 0 01 inches 30 1 Month Rain 0...

Страница 22: ...ctet Note 84 1 Subnet Mask 1st octet Note 85 1 Subnet Mask 2nd octet Note 86 1 Subnet Mask 3rd octet Note 87 1 Subnet Mask 4th octet Note 88 1 Default Gateway 1st octet Note 89 1 Default Gateway 2nd o...

Страница 23: ...memory write command is successful 117 1 Open Collector 1 register to monitor 118 1 Open Collector 1 threshold 119 1 Open Collector 1 Direction 0 down 1 up 120 1 Open Collector 1 register to monitor 1...

Страница 24: ...KTA 282 Modbus TCP Weather Station Gateway 7 05 2013 www oceancontrols com au Page 24 of 25...

Страница 25: ...KTA 282 Modbus TCP Weather Station Gateway 7 05 2013 www oceancontrols com au Page 25 of 25...

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