ComCom2026: TCP and UDP Communication Test Tool

Overview

ComCom2026 is a Windows communication test tool for testing TCP and UDP send/receive.
It can be used to check communication with PLCs, industrial devices and IoT devices, and to debug CIP, FINS, MC protocol and Modbus TCP.
You can send any byte sequence or string, check received data and record communication logs. It is useful for checking communication with PLCs and industrial devices.

Main Features

• TCP communication testing
• UDP communication testing
• Send/receive log display
• Periodic sending
• Message list management
• Temporary storage of received data
• PLC communication debugging
• Industrial protocol testing

Bundled protocols

• CIP
• FINS
• MC protocol
• Modbus TCP
• KV Host Link

ComCom2026 screen

Tested on: Win11
Framework: .NET 10.0

How to Use

Protocol

Select UDP or TCP

Destination IP, destination port No.

Enter the destination IP address and port number

Send message list

[Send]

Sends the message on the selected line

Send/receive history

Shows sent and received data

Menu bar

File (F) - Open send list

Loads a list file

File (F) - Save send list

Saves the list file

File (F) - Save send/receive history

Saves the send/receive history

Memo list

Shows what is stored in the memos

Extensions (X) - Start periodic send

Sends the send data message periodically

Extensions (X) - Stop periodic send

Stops periodic sending

Extensions (X) - Period...

Shows a dialog to set the periodic interval

Communication Examples by Protocol

Examples of communicating using the bundled send lists

CIP communication (cip.txt)

1. Open the bundled cip.txt with [File (F)] - [Open send list]
2. Set the destination IP and port number (44818) and press the [Connect] button to connect
3. Double-click or select 0x65,0x00,0x04,0x00... on line 2 of the send list and press the [Send] button
4. The communication is shown in the send/receive history
5. Next, double-click or select 0x6F,0x00,0x1E,0x00,{0}... on line 3 of the send list and press the [Send] button
   (this sends a command that includes the handle received on line 2)
6. The command on line 3 sends a ReadVariable command that reads the value of the variable "testInt"
7. The communication is shown in the send/receive history
   The last 4 bytes, C3 00 D8 F0, are the variable's value
   (C3 00 is the INT type, D8 F0 is -10000 in decimal)

List of variable data types

FINS UDP communication (fins.txt)

The FINS addresses are 0.10.17 for the PC and 0.21.0 for the PLC

1. Open the bundled fins.txt with [File (F)] - [Open send list]
2. Set the destination IP and port number (9600) and press the [Connect] button to connect
3. Double-click or select 0x80,0x00,0x02,0,21,0,0,10,17,1,0x01,0x01,0x82... on line 2 of the send list and press the [Send] button
   This sends a memory area read (01 01) command that reads 10 words from D0
4. The communication is shown in the send/receive history
   From byte 11, 01 01 is the command, 00 00 is normal completion, and the data follows: 12 34 56 78 ....

FINS TCP communication (finsTCP.txt)

1. Open the bundled finsTCP.txt with [File (F)] - [Open send list]
2. Set the destination IP and port number (9600) and press the [Connect] button to connect
3. Double-click or select "FINS",0x00,0x00,0x00,0x0C... on line 2 of the send list and press the [Send] button
4. The communication is shown in the send/receive history
5. Next, double-click or select "FINS",0x00,0x00,0x00,0x1A... on line 3 of the send list and press the [Send] button
   (this sends a command that includes the node address received on line 2)
   The command on line 3 is a memory area read (01 01) command that reads 10 words from D0
6. The communication is shown in the send/receive history
   From byte 27, 01 01 is the command, 00 00 is normal completion, and the data follows: 12 34 56 78 ....

KV Host Link communication (kv_host.txt)

1. Open the bundled kv_host.txt with [File (F)] - [Open send list]
2. Set the destination IP and port number (8501) and press the [Connect] button to connect
3. Double-click or select "?k",0x0d on line 3 of the send list and press the [Send] button
   This sends the "model inquiry" command
4. The communication is shown in the send/receive history
   35 37 0D 0A : 57..
   '57' means KV-8000

MC protocol communication (mcprotocol.txt)

1. Open the bundled mcprotocol.txt with [File (F)] - [Open send list]
2. Set the destination IP and port number (4999) and press the [Connect] button to connect
3. Double-click or select 0x50,0x00,0x00,0xFF,0xFF,0x03,0x00,0x0C... on line 2 of the send list and press the [Send] button
   This sends a command that reads 10 words from D0
4. The communication is shown in the send/receive history
   The read data starts at byte 12: 01 00 02 00 03 00 ...

FAQ

Is ComCom2026 free?

Yes, it is free to use.

Which communication methods are supported?

TCP and UDP communication are supported.

Which protocols are supported?

CIP, FINS, MC protocol, Modbus TCP and KV Host Link are supported.

Can it send periodically?

It can repeatedly send data at any interval.

Related pages

• OMRON CIP Message Communication (UCMM)
• OMRON Variable Access with CIP Explicit Messages
• OMRON CIP Object List
• KEYENCE CIP Object List
• OMRON FINS Message Communication

Related tools

ComEmulator

When connecting a PLC to an external device via RS-232C or Ethernet, you can emulate the external device on a PC before connecting it

CipMes

An application that sends CIP messages using Ethernet socket communication

FinsMes

An application that sends FINS messages using Ethernet socket communication

Download

By downloading, you are deemed to have agreed to the Terms of Use

comcom2026.zip

The old comcom.zip is here

The following send list files are included

• CIP commands (cip.txt)
• FINS-UDP commands (fins.txt)
• FINS-TCP commands (finsTCP.txt)
• KV Host Link commands (kv_host.txt)
• MC protocol (mcprotocol.txt)
• Modbus-TCP commands (modbus_tcp.txt)

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