# 13.2 On-line

**Introduction**

\[On-line] provides function to users for checking the HMI project and communication.

**Requirement**

1\) Project is compiled and .wmt file exists

2\) PC is connecting with PLC device

**Operating procedure**

1\) Click \[On-line] icon to open the online simulator

2\) The \[Online Emulator serial select tool] pop-up automatically, as following picture shows, the detailed description showed in following content.

![](/files/-LvOJmF_uBWUmWmtd898)

* PC link1/ PC link2/ PC link 3 correspond to HMI protocol list number;
* COM ports in the drop-list correspond to PC port.

{% hint style="success" %}
**Result**

1\) On-line simulator runs HMI project;

2\) HMI project is communicating with PLC device;
{% endhint %}

{% hint style="info" %}
✎**Note:**

1\) Most Desktop only has RS232 port, if users need to use RS485 and RS422, please use converter for them.

2\) Online simulation only work for 30 minutes.
{% endhint %}


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