Experimental Physics and
Industrial Control System

"Mark Rivers" <[email protected]> · Wed, 2 Feb 2011 22:49:04 -0600

According to the medm Reference Manual it uses the same expression syntax (and probably the same parser) as the calc record.  The calc record is limited to numeric (double) inputs, not strings.  So I don't think medm can handle strings in the calculation you are using.

Mark

________________________________

From: [email protected] on behalf of Jay Steele
Sent: Wed 2/2/2011 5:21 PM
To: [email protected]
Subject: calc doesn't appear to be working with MEDM for string expressions(Win32 Extension Version 1.40)

Hi all,

    I'm trying to get the attached logic working with MEDM and string-valued record fields and it isn't working. For the expression "A = B", the text always appears, regardless if string A is different or the same as string B. Do I need to do something special to make strings work with the MEDM calc functionality? Note that I'm using MEDM from EPICS WIN32 Extension Version 1.40. 

    The A and B string sizes are 18 characters. 

Here is the text from the adl file. 

text {
 object {
  x=320
  y=205
  width=180
  height=14
 }
 "basic attribute" {
  clr=20
 }
 "dynamic attribute" {
  vis="calc"
  calc="A = B"
  chan="$(P)scan1.P1PV"
  chanB="$(P)scan2.P1PV"
 }
 textix="ERROR: SAME MOTORS"
 align="horiz. centered"
}

Thanks,

Jay Steele

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System