CKL Series Modbus, Serial to Ethernet Gateways are designed for industrial-grade Serial to Ethernet communication and particularly for facilities of rugged industry and infrastructure using Modbus Protocol. CKL Series Modbus, Serial to Ethernet Gateways are tailored to perform various features such as wide temperature range, wide power input range and several connectivity ports. Thus, CKL Series Modbus, Serial to Ethernet Gateways are the best choice for facility management, sewage treatment, power utility, telecommunication, transportation and all other applications that require industrial Serial to Ethernet connectivity and Modbus TCP or RTU Protocol conversion.

CKL Series which have REDZ Broadband Power Line (BPL) link allows devices to communicate with full transparent TCP/IP standard over Low Voltage power lines and allows easy connection between TCP/IP based terminals without use of extra cables.

CKL Series Modbus, Serial to Ethernet Gateways can connect all field serial devices to TCP/IP based network. It has 3 Gateway Operating Modes. In Transparent Communication Mode it acts as Serial to Ethernet Gateway and lets field serial devices to be controlled over TCP/IP Network. In Modbus TCP to RTU Conversion Mode it can help field Modbus RTU device to communicate with Modbus TCP Master device or software over TCP/IP Network. In Modbus RTU to TCP Conversion Mode it connects Modbus RTU master device or software to the TCP/IP Network and lets it to communicate with field Modbus TCP or RTU devices. It is the one device solution that support all Modbus TCP or RTU communication networks. Typical applications: Automated Meter reading, Home – Building – Industrial Automation, Remote Control, Remote I/O, Telemetry…

CKL Series Modbus, Serial to Ethernet Gateways have the versions with and without BPL (Broadband Power Line ) Link.

2.1 Features

• Supports 2 x 10/100Base-T(X) ports
• Supports Full/Half-Duplex, auto MDI/MDI-X on each port
• Supports 1 x RS232 and 1 x RS485 Serial Connection up to 921600 Baud
• Embedded web interface for ease of use
• Instant switch between Server-Client Operating Modes with buttons
• Up to 10 client connection in Server Mode
• DHCP Server Capability
• Easy to follow Device Status on web interface
• 3 different Gateway Operating Modes:
  Transparent Communication
  Modbus TCP to RTU Conversion
  Modbus RTU to TCP Conversion
• Transparent Operating Mode lets device act as Serial to Ethernet Gateway
• Modbus TCP to RTU (used with Modbus TCP Master Device) Operating Mode lets device act as Modbus Gateway
• Modbus RTU to TCP (used for Modbus RTU Master Device) Operating Mode lets device act as Modbus Gateway
• Up to 10 remote TCP/IP device connection in Modbus RTU to TCP Gateway Operating Mode
• Easy to follow Serial and Ethernet data packages on web interface
• Black List and White List based IP Filter in TCP Server Mode
• Firmware Upgrade over Web
• 2 firmware storage capability on same device (1 active only)
• AC or DC wide range power options
• Wide operating temperature range from -25 to 70 °C AC and -40 to 85 °C DC power input versions
• Rugged Metal IP-40 housing design
• DIN-Rail mounting

2.2 Extra Features for Models with BPL

• Supports 2 x 10/100Base-T(X) ports + 1 x BPL link
• Wide range 3 phase AC input
• Supports up to 30Mbps PHY rate on BPL with Up to 10 hops and 1000 nodes
• Up to 432 sub-carriers from 2 to 28MHz analog bandwidth
• Support LDPC-C FEC with 128-bit AES core
• Plug and play with Master/Slave selection via web interface

Each device has a Din-Rail kit on rear panel. The Din-Rail kit helps device to fix on the Din-Rail. Slant the switch and mount the metal spring to Din-Rail.

Then Push the switch toward the Din-Rail until you heard a “click” sound.

4.1 CKL154 & CKL254

4.2 CKL655

5.1 CKL154

1. Power Input DC: 5-48V ( allows up to 60V) DC. Polarity protected so that the power input can be connected in any direction
2. Power LED: Turns ON when there is power in device
3. Reset Buttons
   RESET TO SERVER: Resets the device to factory setting as Server from Server-Client Operating Modes
   RESET TO CLIENT: Resets the device to factory setting as Client from Server-Client Operating Modes
   Reset can be done at any time by pushing any of the button for 5 seconds.

5.2 CKL254

1. Power Input AC: 100 - 240V AC (120 – 370V DC), 50Hz to 60Hz AC input
2. Power LED: Turns ON when there is power in device
3. Reset Buttons
   RESET TO SERVER: Resets the device to factory setting as Server from Server-Client Operating Modes
   RESET TO CLIENT: Resets the device to factory setting as Client from Server-Client Operating Modes
   Reset can be done at any time by pushing any of the button for 5 seconds.

5.3 CKL655 (older version)

1. Power Input AC: 3 phase input, 110V–240V/50-60Hz. It is also ok to connect only single phase to the device such as L1-N connection only.
   AC Power supply use L1-N only. Phase 2-3 connections are used to BPL signal transmission.
2. Power LED: Turns ON when there is power in device
3. Reset Buttons
   RESET TO SERVER: Resets the device to factory setting as Server from Server-Client Operating Modes
   RESET TO CLIENT: Resets the device to factory setting as Client from Server-Client Operating Modes
   Reset can be done at any time by pushing any of the button for 5 seconds.

 

5.4 CKL655 (newer version)

1. Power Input AC: 3 phase input, 110V–240V/50-60Hz. It is also ok to connect only single phase to the device such as L1-N connection only.
   AC Power supply use L1-N only. Phase 2-3 connections are used to BPL signal transmission.
2. Power LED: Turns ON when there is power in device
3. Reset Buttons
   RESET TO SERVER: Resets the device to factory setting as Server from Server-Client Operating Modes
   RESET TO CLIENT: Resets the device to factory setting as Client from Server-Client Operating Modes
   Reset can be done at any time by pushing any of the button for 5 seconds.

CKL Series Modbus, Serial to Ethernet Gateways have standard Ethernet ports. According to the link type, the switches use CAT 3, 4, 5, 5e UTP cables to connect to any other network device (PCs, servers, switches, routers, or hubs).

6.1 Cable Type and Specifications

6.2 ETH Cable Pin Assignments

With 100BASE-TX/10BASE-T cable, pins 1 - 2 are used for transmitting data and pins 3 - 6 are used for receiving data.

CKL Series Modbus, Serial to Ethernet Gateways have 1 x RS232 and 1 xRS485 port. Serial line can be connected other serial devices such as RTUs, PLCs, energy meters or any other field device.

8.1 RS232 Cable Pin Assignments

8.2 RS485 Cable Pin Assignments

Some of the usage scenarios of CKL Series Modbus, Serial to Ethernet Gateways are described below. Usages are not limited to that examples and user may create their own usage scenario.

9.1 Communicate Remote Serial Devices over TCP IP Network

CKL Series Modbus, Serial to Ethernet Gateways can connect field serial device to TCP/IP Network to control that devices remotely with a software on a server or with a TCP/IP device. For example, with CKL Series Modbus, Serial to Ethernet Gateways, users can connect field serial devices such as Electricity Energy Meters and create a system to read that devices remotely.

CKL Gateway devices in field configured for Transparent Communication and act as TCP Server to Serial Device Gateway. Field devices are connected over serial line either over RS232 or RS485 and communication data type and baud rate fixed. 
In need of remote reading of Electricity Energy Meters over optical probe, CKL can still be configured for Transparent Communication and act as TCP Server to Serial Device Gateway and a REDZ MBC144 can be connected for Auto Baud Rate Change together with REDZ KMK114 RS485 optical probe.

9.2 TCP/IP Link for Field Serial Devices

CKL Series Modbus, Serial to Ethernet Gateways can connect field serial devices over TCP/IP Network just like they are connected over serial line. For example, with CKL Series Modbus, Serial to Ethernet Gateways, users can connect 2 different field serial devices such as a Controller and a Sensor and create a system to communicate transparently over TCP/IP Network.

CKL Gateway device in Controller side configured for Transparent Communication and act as TCP Client to Serial Device Gateway. Field device is connected over serial line either over RS232 or RS485 and communication data type and baud rate fixed. CKL can connect to Other CKL device on sensor side by manual entering the IP of TCP Server or simply using REDZ special design, plug and play Server-Client Operating Modes.
CKL Gateway device in sensor side configured for Transparent Communication and act as TCP Server to Serial Device Gateway. Field device is connected over serial line either over RS232 or RS485 and communication data type and baud rate fixed. 

9.3 Modbus TCP to RTU Conversion 

CKL Series Modbus, Serial to Ethernet Gateways can connect field Modbus RTU serial device to TCP/IP Network to control that devices remotely with a software on a server or with a TCP/IP device that communicates in Modbus TCP protocol. For example, with CKL Series Modbus, Serial to Ethernet Gateways, users can connect field Modbus RTU serial devices such as remote sensors and remote Input/output modules to TCP/IP network and create an automation system.

CKL Gateway devices in field configured for Modbus TCP to RTU Conversion and act as TCP Server to Serial Device Gateway. Field devices are connected over serial line either over RS232 or RS485 and communication data type and baud rate fixed.

9.4 Modbus RTU to TCP Conversion 

CKL Series Modbus, Serial to Ethernet Gateways can connect field Modbus RTU serial device to TCP/IP Network to control that devices remotely. If master side is Modbus RTU, CKL Series Modbus, Serial to Ethernet Gateways can connect that part to TCP/IP network as well to make Modbus RTU to TCP conversion. For example, with CKL Series Modbus, Serial to Ethernet Gateways, users can connect field Modbus RTU serial devices such as remote sensors and remote Input/output modules to Modbus RTU master device over TCP/IP network and create an automation system.

CKL Gateway device on Modbus RTU Master side configured for Modbus RTU to TCP Conversion and act as TCP Client to Serial Device Gateway. Field devices are defined as a list in configuration to enable mapping with field devices Modbus Addresses and related CKL remote fixed TCP IPs and ports.

CKL Gateway devices in field configured for Modbus TCP to RTU Conversion and act as TCP Server to Serial Device Gateway. Field devices are connected over serial line either over RS232 or RS485 and communication data type and baud rate fixed. 

CKL Series Modbus, Serial to Ethernet Gateways can be configured over web interface.
Device will get IP from DHCP client when connected to a network. User can use discovery tool to see IP of the device.

Once the IP of the device is set, user may login the device by simply typing the Ip address of device.

NOTE 1: CKL default firmware runs with DHCP off and expects an IP lease. If user need static IP or prefers DHCP on during start up, additional firmware is available.

NOTE 2:  If there is no DHCP server in LAN, REDZ device will get default 192.168.1.1 IP if it is set as Server Mode. It will get default 192.168.1.100 IP if it is set as Client mode.

10.1 Connecting Web Interface

Simply write IP of the device to the http client. Google Chrome is suggested to use. Login screen will pop up.
Default user name: admin
Default password: admin

Main screen of device will appear with following information.

10.2 MENU: Operating Mode

From this menu user may select the operating mode of the device.

• CKL can act for example TCP server and wait for TCP socket connection. This way the received TCP data will be transferred to Serial Device and vice versa. Set “Server Configuration” in this case.
• If Set to Client Mode CKL will connect to a TCP server and yet again the received TCP data will be transferred to Serial Device and vice versa. Set “Client Configuration” in this case.
• There 3 Gateway Operating modes: 
  Transparent Communication: Available in both TCP Server and Client Operating Modes
  Modbus TCP to RTU Conversion: Available in TCP Server Operating Mode
  Modbus RTU to TCP Conversion: Available in TCP Client Operating Mode

Device Name” field is used to identify device.

Once the setting has been changed, “Save Configuration” button will be enabled.

After clicking button system will tell if the settings applied successfully or not.

NOTE 1: CKL Series Modbus, Serial to Ethernet Gateways can keep configuration of 2 different modes in its memory and once the configuration enabled, its already saved settings will be applied. Device can act as Server or Client at a time.

NOTE 2: Settings will be applied once the device is rebooted from web interface or repowered manually.

10.3 MENU: Network Settings - Server

From this menu user may change the network settings of the device

• User can change TCP Listening port for field devices
• User can select maximum number of clients allowed to connect device
• User can activate DHCP server
• User can force device to a static IP

Following parameters and static IP settings available for “DHCP Server” setting.

Also if the device has Broadband Power Line (BPL) option

NOTE: Standard firmware of REDZ BPL supports up to 10 hops and 1000 nodes. Only 1 device can be MASTER in same network.

Once the setting has been changed, “Save Configuration” button will be enabled.

After clicking button system will tell if the settings applied successfully or not.

NOTE 1: CKL Series Modbus, Serial to Ethernet Gateways can keep configuration of 2 different modes in its memory and once the configuration enabled, its already saved settings will be applied. Device can act as Server or Client at a time.

NOTE 2: Settings will be applied once the device is rebooted from web interface or repowered manually.

10.4 MENU: Network Settings - Client

From this menu user may change the network settings of the device

• User can manually enter IP of Servertt
• User can change TCP Server Listening port
• User can force device to a static IP

Following parameters and static IP settings available for “Use Static IP Address” setting.

Also if the device has Broadband Power Line (BPL) option:

NOTE: Standard firmware of REDZ BPL supports up to 10 hops and 1000 nodes. Only 1 device can be MASTER in same network. If the device is in client mode, it is suggested to use “NODE” as setting.

Once the setting has been changed, “Save Configuration” button will be enabled.

After clicking button system will tell if the settings applied successfully or not.

NOTE 1: CKL Series Modbus, Serial to Ethernet Gateways can keep configuration of 2 different modes in its memory and once the configuration enabled, its already saved settings will be applied. Device can act as Server or Client at a time.

NOTE 2: Settings will be applied once the device is rebooted from web interface or repowered manually.

NOTE 3: If Modbus RTU to TCP Conversion is enabled for Gateway Operating mode, the remote server IP will be entered in Gateway Settings page and only following menu items will be available.

10.5 MENU: Serial Settings

From this menu user may change settings related with RS232 or RS485 connection. Only one of the communication will be available at a time. ( RS232 or RS485)

• User can select to activate RS232 line and can set baud rate and data type for serial line.
• User can select to activate RS485line and can set baud rate and data type for serial line.

Once the setting has been changed, “Save Configuration” button will be enabled.

After clicking button system will tell if the settings applied successfully or not.

NOTE 1: CKL Series Modbus, Serial to Ethernet Gateways can keep configuration of 2 different modes in its memory and once the configuration enabled, its already saved settings will be applied. Device can act as Server or Client at a time. Let’s say TCP Server enabled in Server operating mode and RS232 serial line enabled in Client operating mode on same device, the device can switch between to settings simply by changing the mode.

NOTE 2: Settings will be applied once the device is rebooted from web interface or repowered manually.

NOTE 3: This page has same settings both for Server and Client operating modes.

10.6 MENU: Device Status - Server

From this menu user may monitor device status and statistics based on operating mode of device. The page also helps users to check device health.

After clicking “Refresh Status” button, system will reload data only and will not reload page. Button will be disabled during reload for an instance. If timeout occurs during the reload, the button will be enabled again with warning of timeout. In normal operation reload of status data will be done immediately.

10.7 MENU: Device Status - Client

From this menu user may monitor device status and statistics based on operating mode of device. The page also helps users to check device health.

If Modbus RTU to TCP Conversion is selected, Status page will show remote client status as well.

After clicking “Refresh Status” button, system will reload data only and will not reload page. Button will be disabled during reload for an instance. If timeout occurs during the reload, the button will be enabled again with warning of timeout. In normal operation reload of status data will be done immediately.

10.8 MENU: Gateway Settings - Server

From this menu user may change Gateway Operating Modes for TCP Server device. There are 2 options:

• Transparent: CKL sends received data from TCP/IP side to the Seral line (RS232 or RS485) and with the same idea sends the received data from Serial line to the TCP/IP side.
• Modbus TCP to RTU: CKL expect a connection from a Modbus TCP Master device and sends Modbus TCP commands as Modbus RTU commands to the Serial line (RS232 or RS485) and with the same idea sends the received Modbus RTU response data from Serial line to the TCP/IP side as Modbus TCP response.

Once the setting has been changed, “Save Configuration” button will be enabled.

After clicking button system will tell if the settings applied successfully or not.

NOTE 1: CKL Series Modbus, Serial to Ethernet Gateways can keep configuration of 2 different modes in its memory and once the configuration enabled, its already saved settings will be applied. Device can act as Server or Client at a time. This way different Gateway settings can be stored in 2 different operating modes.

NOTE 2: Settings will be applied once the device is rebooted from web interface or repowered manually. 

10.9 MENU: Gateway Settings - Client

From this menu user may change Gateway Operating Modes for TCP Client device. There are 2 options.

• Transparent: CKL sends received data from TCP/IP side to the Seral line (RS232 or RS485) and with the same idea sends the received data from Seral line to the TCP/IP side.
• Modbus RTU to TCP: CKL expect a connection from a Modbus RTU Master device and get Modbus RTU commands over the Serial line (RS232 or RS485). Based on Modbus Addresses of received commands, CKL routes the data to target Modbus TCP device. CKL also converts received Modbus TCP response and with the same idea sends it to Serial line.

Once the setting has been changed, “Save Configuration” button will be enabled.

After clicking button system will tell if the settings applied successfully or not.

 

NOTE 1: CKL Series Modbus, Serial to Ethernet Gateways can keep configuration of 2 different modes in its memory and once the configuration enabled, its already saved settings will be applied. Device can act as Server or Client at a time. This way different Gateway settings can be stored in 2 different operating modes.

NOTE 2: Settings will be applied once the device is rebooted from web interface or repowered manually.

10.10 MENU: Gateway Status

From this menu user may monitor received and sent package details. The latest messages received from TCP/IP and RS232/RS485 serial sides shown here both in HEX and ASCII (if representable) formats with time stamps.  

After clicking “Refresh Gateway Status” button, system will reload data only and will not reload page. Button will be disabled during reload for an instance. If timeout occurs during the reload, the button will be enabled again with warning of timeout. In normal operation reload of status data will be done immediately.

NOTE: This page has same options both for Server and Client operating modes.

10.11 MENU: Security Settings

This menu is available only in TCP Server Operating mode since it filters TCP/IP connections based on IP of the devices.
From this menu user may activate TCP IP filter based on White list (accepted packages from IP Address) or Black list ( rejected packages from IP Address). 

• User can select to activate White List and CKL device will accept data packages only from the devices with addresses stated in the list.
• User can select to activate Black List and CKL device will accept all data packages except from the devices with addresses stated in the list.

Following settings are available for any of the list :

Once the setting has been changed, “Save Configuration” button will be enabled.

After clicking button system will tell if the settings applied successfully or not.

NOTE : Settings will be applied once the device is rebooted from web interface or repowered manually.

10.12 MENU: Management

From this menu user may change parameters or send command to device.

• User can not change system time. There is no battery inside the device so clock will be lost after a power down and will set to default.

• User can change firmware of device. REDZ CKL Series Modbus, Serial to Ethernet Gateways have easy to use firmware capability and system can store 2 firmware at memory. After a firmware change, user can restore back old firmware anytime needed.

• User can change the login information

• User can change the debug level of the device. REDZ CKL Series Modbus, Serial to Ethernet Gateways series have micro USB and gives log in 115200 - 8N1 format.
  Any terminal program can be used to listen the LOG over micro USB port of the device which is recognized as Virtual COM port in PC.

• User can restore to factory settings and force device to reboot. Factory settings restored for Client if the device in Client mode and factory settings are restored for Server if the device in Server mode.

Firmware upgrade is possible only with files that REDZ supplied. Once the file selected, CKLshows selected file:

Then “Upload Firmware” button must be clicked. Then user must wait until page shows the result.

Then system will show the firmware date and version and user can reboot that firmware.

Typical log for the system is shown below.

NOTE: This page has same settings both for Server and Client operating modes.

CKL154: Modbus, Serial to Ethernet Gateway, 2x 10/100 T(x) ETH ports, 1 x RS232 & 1 x RS485, 5-48V (max. 60V) DC Power Input
CKL254: Modbus, Serial to Ethernet Gateway, 2x 10/100 T(x) ETH ports, 1 x RS232 & 1 x RS485, 90 - 265V AC (100 – 370V DC), 47Hz to 63Hz AC Power Input
CKL655: Modbus, Serial to Ethernet Gateway, 2x 10/100 T(x) ETH ports + 1 x BPL (Broadband Power Line) Link, 1 x RS232 & 1 x RS485, 3 Phase AC Power Input, 110V–240V/50-60Hz