APPA 305 Multimeter and RS232 protocol

[Sonnich]

Hi all!

I have got a multimeter APPA 305, which can send data using RS232.

Does anyone have anything about this?

I am able to read data from the thing, but I dont get it:
UU $006APPA305 842002550.00.02 $09 $00 $04 $80 $13 $00 $80 $FF $00 $00
$01 $12

I need to "trigger" it now and then, and then process the recieved
data.

BR
Sonnich