Hi Reza,

Not much info on the net, but give this a try:

Assuming scale commands and data use the same comm port:

Create a form. Add a property "scaledata"
Drop an instance of the mscomm32.ocx on the form, name it "scalecomm"
Set the "Settings" property to "2400,7,E,1", and the "Commport" property to "2".
Drop a command button and timer on the form.
In the command button "Click" method add:

THISFORM.Timer1.Enabled = .T.
THISFORM.scalecomm.output = "The_command_to_interrogate_the_scale"

substituting the proper command for the scale, of course.

In the timer's "Timer" method add:

THIS.ENABLED = .F.
THISFORM.scaledata = THISFORM.scaledata + THISFORM.scalecomm.input

In the form's Init add:

THIS.scalecomm.portopen = .T.
THIS.scaledata = ""

In the form's Destroy add:

THIS.scalecomm.portopen = .F.

You may need to adjust a few other things depending on the scale's requirements. The scale data should accumulate in the form's scaledata property for your use. If it takes more than 1 second for the scale to respond, increase the timer's "Interval". You could add an editbox and bind it to the scaledata for display while testing. Let me know if this gets you started.

>Dear Jim
>Thanks for your reply.
>Here is some information about our instruments :
>
>Leon Engineering weighindicator, model LD5218
>
>it show weight and stop . i want to get this when i press a command botton .
>i see this setting : com2 2400,7,E,1
>
>thank you very much for your attention.