# Data Sheet

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<table border="1" id="bkmrk-c20-c21-c22-c23-c24-" style="border-collapse: collapse; width: 100%;"><colgroup><col style="width: 50%;"></col><col style="width: 50%;"></col></colgroup><tbody><tr><td>**C20 C21 C22 C23 C24 C25**

**[![8687e11c-6546-4888-bb0e-5ec48c9a7daf.jpg](https://doc.redisage.com/uploads/images/gallery/2024-03/scaled-1680-/8687e11c-6546-4888-bb0e-5ec48c9a7daf.jpg)](https://doc.redisage.com/uploads/images/gallery/2024-03/8687e11c-6546-4888-bb0e-5ec48c9a7daf.jpg)**

</td><td>**Features**

- Ethernet converter to RS232/RS485
- ESD protection for the RS485 data line
- Power supply: +12 to +30 VDC
- Transmission speed up to 115200 bps
- Tx, Rx and power LED indicators
- RS485 embedded termination 120 ohm
- Operating temperatures: -40°C to +75°C
- DIN rail mounting
- Dimensions: 90x56.4x22.5 mm
- 3 years warranty
- Customization of OEM is welcomed

</td></tr></tbody></table>

### Introduction

C20 - C22 are a products family of reliable converters based on the **ESP32 Xtensa LX6** microcontroller, extending the capabilities of industrial devices.  
C23 - C25 are a products family of reliable converters based on the **STM32F4** microcontroller, extending the capabilities of industrial devices.

The addition of a network interface allows remote access and full control over communication via a computer.

The user performs the basic configuration of transmission parameters in a browser or via a Telnet/serial console.

Dedicated EMC integrated circuits guarantee improved connection quality by limiting the impact of the interferences typical for an industrial environment.

### {{@170#bkmrk-specifications}}

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### Variants  


#### C20 - Ethernet Converter 2 x RS232

<div drawio-diagram="53"><img src="https://doc.redisage.com/uploads/images/drawio/2024-03/drawing-10-1711381108.png" alt=""/></div>

#### C21 - Ethernet Converter 1 x RS485  


<div drawio-diagram="54"><img src="https://doc.redisage.com/uploads/images/drawio/2024-03/drawing-10-1711381700.png" alt=""/></div>

#### C22 - Ethernet Converter 2 x RS232/RS485  


<div drawio-diagram="55"><img src="https://doc.redisage.com/uploads/images/drawio/2024-03/drawing-10-1711381754.png" alt=""/></div>

<p class="callout warning">In the C22 converter user should use only RS232 or only RS485 interface of one port as they occupy the same internal bus of the device.</p>

#### C23 - Ethernet Converter 4 x RS232  


<div drawio-diagram="56"><img src="https://doc.redisage.com/uploads/images/drawio/2024-03/drawing-10-1711381821.png" alt=""/></div>

#### C24 - Ethernet Converter 4 x RS485  


<div drawio-diagram="57"><img src="https://doc.redisage.com/uploads/images/drawio/2024-03/drawing-10-1711381861.png" alt=""/></div>

#### C25 - Ethernet Converter 2 x RS232 &amp; 2 x RS485  


<div drawio-diagram="58"><img src="https://doc.redisage.com/uploads/images/drawio/2024-03/drawing-10-1711381895.png" alt=""/></div>

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### Getting started  


#### Power supply

Ethernet converters C20 - C25 have wide voltage power input (12-30 VDC) and the power consumption is less than 1 W.

#### LED indicators

Ethernet converters C20 - C22 have 3 LED indicators:

- PW LED Blue - Power
- ETH LED Green - Network activity
- ST LED Orange - USB-UART serial console mode

[![20708068-859a-46bf-8b76-783b7400789a.png](https://doc.redisage.com/uploads/images/gallery/2024-03/scaled-1680-/20708068-859a-46bf-8b76-783b7400789a.png)](https://doc.redisage.com/uploads/images/gallery/2024-03/20708068-859a-46bf-8b76-783b7400789a.png)

Ethernet converters C23 - C25 have 5 LED indicators:

- PW LED Blue - Power
- ER LED Yellow - Error
- ETH LED Green - Network activity
- COM LED Green - RS232/RS485 activity
- CN LED Yellow - Console mode
- SR LED Red - Service mode

[![66a7b90e-9af7-4b47-ae63-40409f98a845.png](https://doc.redisage.com/uploads/images/gallery/2024-03/scaled-1680-/66a7b90e-9af7-4b47-ae63-40409f98a845.png)](https://doc.redisage.com/uploads/images/gallery/2024-03/66a7b90e-9af7-4b47-ae63-40409f98a845.png)

#### Configuration by the Web Page  


Default configuration of the Ethernet Converters:

- IP address: **192.168.100.100**
- Subnet mask: **255.255.255.0**
- Gateway: **192.168.100.1**
- DNS 1: **192.168.100.1**
- DNS 2: **8.8.8.8**

Default login details:

- User name: **admin**
- Password: **admin123**

To access the web page, open the web browser, type the IP address in the address bar and log in using the default user name and password. The device and a PC must be connected to the same Local Area Network.

[![image.png](https://doc.redisage.com/uploads/images/gallery/2025-03/scaled-1680-/1vpimage.png)](https://doc.redisage.com/uploads/images/gallery/2025-03/1vpimage.png)

After a successful login, the status page will show the current status of the ports.

[![621a9445-3b44-42ec-b18b-2dd9f1ff95ef.png](https://doc.redisage.com/uploads/images/gallery/2024-03/scaled-1680-/621a9445-3b44-42ec-b18b-2dd9f1ff95ef.png)](https://doc.redisage.com/uploads/images/gallery/2024-03/621a9445-3b44-42ec-b18b-2dd9f1ff95ef.png)

To change the user name and password, click the user icon and select “Edit user”.

Port configuration is available on the “Ports” page.

[![99bb0679-5937-4fb6-b6f5-59e8d0b89d74.png](https://doc.redisage.com/uploads/images/gallery/2024-03/scaled-1680-/99bb0679-5937-4fb6-b6f5-59e8d0b89d74.png)](https://doc.redisage.com/uploads/images/gallery/2024-03/99bb0679-5937-4fb6-b6f5-59e8d0b89d74.png)

[![762f162a-1c33-4674-8f6f-827edb003235.png](https://doc.redisage.com/uploads/images/gallery/2024-03/scaled-1680-/762f162a-1c33-4674-8f6f-827edb003235.png)](https://doc.redisage.com/uploads/images/gallery/2024-03/762f162a-1c33-4674-8f6f-827edb003235.png)

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<p class="callout warning">Changing port’s service closes all sockets connected to the ports.</p>

<p class="callout warning">In the UDP mode, port number 15051 is reserved for UDP broadcast service.</p>

Network settings can be changed on the “Network” page.

[![8386aa9b-6add-432d-945d-303e590ed269.png](https://doc.redisage.com/uploads/images/gallery/2024-03/scaled-1680-/8386aa9b-6add-432d-945d-303e590ed269.png)](https://doc.redisage.com/uploads/images/gallery/2024-03/8386aa9b-6add-432d-945d-303e590ed269.png)

[![98a9fcdf-9549-4d9a-9e04-ef90021cfaff.png](https://doc.redisage.com/uploads/images/gallery/2024-03/scaled-1680-/98a9fcdf-9549-4d9a-9e04-ef90021cfaff.png)](https://doc.redisage.com/uploads/images/gallery/2024-03/98a9fcdf-9549-4d9a-9e04-ef90021cfaff.png)

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[![e3574681-36ef-4fdb-8979-97046c2c7d5d.png](https://doc.redisage.com/uploads/images/gallery/2024-03/scaled-1680-/e3574681-36ef-4fdb-8979-97046c2c7d5d.png)](https://doc.redisage.com/uploads/images/gallery/2024-03/e3574681-36ef-4fdb-8979-97046c2c7d5d.png)

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On the “Device” page, there are tools used to a firmware update, a factory reset and a device reboot.

[![744e0c74-d7cf-43f3-a024-fa06e1bd9fc2.png](https://doc.redisage.com/uploads/images/gallery/2024-03/scaled-1680-/744e0c74-d7cf-43f3-a024-fa06e1bd9fc2.png)](https://doc.redisage.com/uploads/images/gallery/2024-03/744e0c74-d7cf-43f3-a024-fa06e1bd9fc2.png)

On the “Info” page, there is information about firmware, model, serial number and frontend version.

[![1a9460c1-8535-4837-9f71-c1b91c86eece.png](https://doc.redisage.com/uploads/images/gallery/2024-03/scaled-1680-/1a9460c1-8535-4837-9f71-c1b91c86eece.png)](https://doc.redisage.com/uploads/images/gallery/2024-03/1a9460c1-8535-4837-9f71-c1b91c86eece.png)

#### Configuration by the Serial Console  


The device can be reconfigured via a serial console. C20 - C22 require a dedicated USB/UART converter connected to the USB micro-B connector on the front of the device. C23 - C25 can be directly connected to a PC through a USB cable.

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Once this is done, log in using the default username and password, then change the network settings using "ipconfig" command.

[![9ec0da3e-1e6e-459b-8c0e-388422e65cb3.png](https://doc.redisage.com/uploads/images/gallery/2024-03/scaled-1680-/9ec0da3e-1e6e-459b-8c0e-388422e65cb3.png)](https://doc.redisage.com/uploads/images/gallery/2024-03/9ec0da3e-1e6e-459b-8c0e-388422e65cb3.png)

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#### Configuration by the Telnet Console  


Access to the Telnet console can be obtained using a serial terminal program. Configure the connection type to Telnet, enter the IP address and Telnet port number (**23** by default).

Telnet console commands are the same as ones described in the serial console section.

[![f99a2f2b-4bbf-4551-bb89-3a6eb00fd766.png](https://doc.redisage.com/uploads/images/gallery/2024-03/scaled-1680-/f99a2f2b-4bbf-4551-bb89-3a6eb00fd766.png)](https://doc.redisage.com/uploads/images/gallery/2024-03/f99a2f2b-4bbf-4551-bb89-3a6eb00fd766.png)

#### Redisage Configurator  


To configure the RemoteCOM ports, use the Redisage Configurator program. Redisage Configurator is an app used to emulate a connection between the converter and a PC as if it would be connected directly to the COM port.

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[![5e5210ff-821e-48c9-ab69-bb723fca635e.png](https://doc.redisage.com/uploads/images/gallery/2024-03/scaled-1680-/5e5210ff-821e-48c9-ab69-bb723fca635e.png)](https://doc.redisage.com/uploads/images/gallery/2024-03/5e5210ff-821e-48c9-ab69-bb723fca635e.png)

<p class="callout warning">If any change is made to the port configuration, make sure to apply it with the “Save Changes” button.</p>

#### Reset to factory defaults  


Reset to factory defaults is possible on the web page in the device section or using the service mode.

#### Service mode

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SR-D