Ethernet Standards 
IEEE 802.3 for 10Base-T
IEEE 802.3u for 100Base-T(X)
IEEE 802.3x Flow Control
Mac Table 
1K MAC address entry
Processing 
Store-and-Forward
Memory 
448K bits packet buffer memory

PHY Data Rate
Up to 240 MHz
MAC Layer Protocol
CSMA/CA
Modulation Technology
OFDM-432
VLAN
IEEE802.1q/ IEEE802.1p/ IEEE802.3d

NTP is used to syncronize device time. Device checks if NTP time server is available in every 10 seconds after repower. Device synhcronizes its time if NTP time is available and stops checking after successfull synchronization.

MQTT Publisher based on Modbus query is available in Device Function:
Modbus TCP/RTU Scheduler with MQTT Data Send
Modbus Protocol
Modbus TCP or RTU Selectable by User
Modbus Devices
Up to 64 Modbus commands can be defined by User
Modbus Address
Independently selectable by User
Modbus Function Code
Read Coil Status (FC=01)
Read Input Status (FC=02)
Read Holding Registers (FC=03)
Read Input Registers (FC=04)
Selectable
Modbus Command Settings
Register Adress
Total Number of Registers
Query Interval
Time Out
Independently Selectable for each command
Modbus RTU Serial Settings
Serial interface RS232 or RS485 Serial data settings and Baud Rate
Independently Selectable for each command
Modbus TCP Settings
TCP/IP and TCP Port Settings
Independently Selectable for each command

MQTT Publisher based on Modbus query is available in Device Function:
Modbus TCP/RTU Scheduler with MQTT Data Send
MQTT Connection
Broker IP and Port can be entered
Client ID , User name and Password can be set
Publish Topic and Subscribe Topic can be defined from web interface
Data Send Interval
User can set Data send interval in seconds
Default is 60 seconds and CKL will send Modbus data to MQTT server in that interval
NTP Server
NTP server time will be added to each MQTT message
Data Format
There is 1 predefined format
DATA AS MODBUS FRAME: Send just like the response of Modbus query as hex data

Console Port
USB Type C or Micro USB connection for LOG in 115200 baud
10/100T(X) RJ45 Ports
Ethernet Connection on 2 ports
Serial Ports
5 pin wired Terminal Connection
Tx, Rx, GND for RS232
A and B for RS485
Reset Buttons
Reset to Client and Reset to Server Operating modes buttons

Power Indicator
Power LED
10/100T(X) Indicators

Activity LEDs:
ETH1, ETH2 and Activity of device itself (Marked as device series name, such as CKL/TLM/HUR)
System Indicators
Status LED,
Tx and Rx of data LEDs and Server LED
(LED ON: Server Operating Mode, LED OFF: Client Operating Mode)
Console Indicators
Tx and Rx of data LEDs

BPL LEDs 
-BPL Activity
-BPL Link
-Master Indication (LED ON: Master, LED OFF: Slave)

Data Connection
Can be purchased in 2 versions:
1. PN Model: Phase to neutral model (Standart Model). That version gets power from terminal pins 1 and 2 from phase and neutral. It can also transmit data from that pins and other pins usage is optional (Ex: Master can be connected to all phases and slaves can be connected to relevant phases)
2. PP Model: Phase to phase model. That version also gets power from terminal pins 1 and 2 from phase and neutral. Data transmission only done through terminal pins 3 and 4. Phase to phase connection can be done to data transmission pins for better performance.
If not used then same phase and neutral connected to power input can still be connected for data transmission for terminal pins 3 and 4.
Power Connection
Can be purchased in 2 versions as well:
1. AC Powered version: 3 phase input, 110V–240V/50-60Hz for PN Models and single phase input for PP Models (L1-N or L2-N or L3-N). 
2. DC Powered version: This model available as PP Model only (Phase to phase model) as data connection and gets 9-36V DC power from terminal pins 1 and 2. Data transmission only done through terminal pins 3 and 4.

Enclosure
Metal, IP40
Dimensions
43 x 95 x 124 (w x d x h) mm
Weight
~400gr
Storage Temperature
-65 to 150 °C
Operating Temperature
-40 to 85 °C 
Operating Humidity
5% to 95% Non-condensing