Failed to redirect multiple items to COM port

[ccdr]

Hello
When I tried to redirect multiple parsed items to the COM port, it failed. Nothing is redirected to the COM port.
If I redirected only one parsed item for each time, it succeeded.
According to the note, I separated multiple items by semicolon and paid attention to the letter case.
This is so strange...
And I tried to concatenate the two items (i.e. string variables) into single item by using Expression plugin. But was not able to find appropriate operator. BTW, how to concatenate two string items?

[Arthur Grasin]

1. Hmm. I suppose you may specify multiple names in the "Data source name" field.

2.

VAR3=VAR1+VAR1

VAR1 and VAR2 must be strings.

[ccdr]

1. Hmm. I suppose you may specify multiple names in the "Data source name" field.

No. I meant the "Parser item name" field. Is it restricted that only one item could be redirected?

[Arthur Grasin]

Yes, only one item. If you want to make a complex data packet you may prepare it before using the Expressions plugin.

[ccdr]

1. Hmm. I suppose you may specify multiple names in the "Data source name" field.

2.

VAR3=VAR1+VAR1

VAR1 and VAR2 must be strings.

If my expression is too long, then how to change line within Expression plugin?

[Arthur Grasin]

Then I need your configuration and incoming data example for this application. In this case I can check it and offer a solution.