Usage and Troubleshooting of Various Communication Simulation Software

### 1. Usage and Troubleshooting of Various Communication Simulation Software

#### 1. General Network Port Communication
General network port communication includes TCP Client and TCP Server, which is the basis of other standard industrial communication protocols for network ports.
##### 1.1 Network Port Communication Assistant
Commonly used network port communication assistants include NetAssist_v4.3.25, TCP/UDP Socket debugging tools, etc. Here we introduce a simple TCP/UDP Socket debugging tool. The TCP/UDP Socket debugging tool is used to create a server or client for testing, which can facilitate project debugging in collaboration with VisionGroup3 software.

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##### 1.2 Troubleshooting Common Network Port Faults
The common troubleshooting process when the network port connection is abnormal is as follows:
1. Check if the hardware connection is normal. Specific process: Press "Win + R" simultaneously → Enter "cmd" → Enter "ping ***.***.***.***" (* represents specific IP address) in the console interface and press "Enter" to check if the connection is normal. Possible reasons for abnormal connection are: incorrect IP address; loose or broken network cable connection.
2. Check if the IP address is set correctly and if the firewall is turned off. The specific process can refer to the camera connection steps.
3. When the software acts as a client but still cannot connect normally, please check if the server is open normally and if the server port number corresponds to the client.
4. If the above methods still cannot solve the problem, you can contact an engineer for solution.
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#### 2. General Serial Port Communication
General serial port communication refers to ordinary serial port communication, which is the basis of other standard industrial communication protocols for serial ports.
##### 2.1 Virtual Serial Port Software Installation
Virtual serial port software can create virtual serial port pairs for devices without serial ports. Together with serial port debugging assistant software, it can quickly and conveniently complete project testing of VisionGroup3 software.

![](/media/202601/1f049af3-2d32-4e29-b390-9270c58497f2_1768284285.png)
##### 2.2 Serial Port Debugging Assistant
Serial port debugging assistant software can create virtual serial port pairs for devices without serial ports. Together with serial port debugging assistant software, it can quickly and conveniently complete project testing of VisionGroup3 software.

![](/media/202601/0a267c37-bd7a-4542-b113-c89767dd8494_1768284355.png)
##### 2.3 Troubleshooting Common Serial Port Faults
The common troubleshooting process when the serial port connection is abnormal, which is also the basis for troubleshooting other serial port device problems, is as follows:
1. Determine if the port exists and is valid. Specific process: Right-click "This PC" → Select "Manage" → Pop up "Computer Management" interface, select "Device Manager", click "Ports (COM & LPT)" to check if the port number exists. If the port number exists but there is a yellow triangle sign on it, it means the serial port is invalid, which often occurs when using a USB to serial cable.
2. Check if the baud rate, data bits, parity bits, stop bits, etc. of the serial port are consistent with the connected device.
3. Common serial cables are divided into straight-through cables and crossover cables. These two types of cables cannot be mixed. When using, make sure to confirm whether it corresponds to the model.

![](/media/202601/795e2c8a-ae6d-46eb-b952-39a96ced2055_1768284510.png)
#### 3. Standard Modbus Communication Protocol
Commonly used Modbus communication protocols include Modbus-RTU, Modbus-TCP, etc., which are general standard protocols designated by the industry or company.
##### 3.1 Modbus Poll Software
Modbus Poll software is a professional Modbus client testing tool.

![](/media/202601/a7eed649-952b-4675-b9a0-48a7adf61ee6_1768284821.png)
##### 3.2 Virtual Modbus Server Software
Modbus Slave software is a professional Modbus server software, but the setting is complex, and a slight error in setting is easy to cause the phenomenon that the software cannot connect, so it is not recommended to use Modbus Slave software for testing. mod_RSsim5.3 software is a virtual Modbus server software. Its operation is simple, and it can facilitate quick viewing and setting of registers, input, and output port status in virtual devices. Main operations of mod_RSsim5.3 software:
1. Modbus type selection, that is, setting the Modbus type of the virtual device. Common types are MODBUS RS232 (corresponding to Modbus-RTU) and MODBUS TCP/IP (corresponding to Modbus-TCP).
2. Modbus parameter setting, that is, when the type is selected as MODBUS RS232, mainly set the port number, baud rate, parity bit, etc.; when the type is selected as MODBUS TCP/IP, mainly set the port number, station address, etc. At this time, the station address cannot be set, and it can be connected through the IP address 127.0.0.1.
3. Display content type selection. Common types are CoilOutputs (corresponding to output ports), Digital Inputs (corresponding to input ports) and Holding Registers (corresponding to holding registers). The order stored in the register is BADC.

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##### 3.3 Troubleshooting Common Standard Modbus Communication Protocol Faults
The common troubleshooting process when the standard Modbus communication protocol connection is abnormal is as follows:
1. First test whether the hardware is connected according to the connected hardware.
2. If the connection still drops immediately after connecting, it is most likely because the access range of the set protocol causes the software to mistakenly think that the device is offline. Therefore, please check the manual of the relevant equipment. Note: The address and length of registers allowed to be read and written by PLC devices and Modbus devices.
#### 4. Various Industrial Communication Protocols
Commonly used industrial communication protocols include: Mitsubishi MC protocol, Siemens S7 protocol, Omron Fins protocol, etc.
##### 4.1 HslCommunicationDemo Software by Engineer Hu
HslCommunicationDemo software is commonly used in the case of project pre-testing without PLC technical support, simulating a PLC for pre-testing. Download address:
<a href="http://www.hslcommunication.cn/">Hu Gong Technology</a>

![](/media/202601/197a0cd1-ea28-46ec-be7e-a255e7b434aa_1768372372.png)

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