Inserting bytes into a Global String

[Madbyte]

Hi,

I need to send the next command to my device (bytes): 0x55 0x55 b1 b2 where b1 and b2 are 8 bits command/values 

b1 = xxxx c3 c2 c1 c0 (control some internal switches in the device)

b2 = v7 v6 v5 v4 v3 v2 v1 v0 (control some calibration values for the device)

I'm using 4 switches for b1 and for now b2 = 0. I'm writing the result value from the switches to a Global Variable (VAR_1) and I want to put that result into a Global String to be sent by the RS232 Output Module using an Event. But I don't know how to put that byte into the Global String I was trying "Calculate Expression Automatically" with no success.

Remembering the HEX function in Visual Basic maybe something like "UU"+ HEX(${VAR_1}) + HEX(0).

Screenshot attached.

Any help?

Thanks

[Madbyte]

Solved! using Output Format Data UU[w] and Global Variable VAR_3= VAR_1*256+VAR_2

Thanks