RE: Stream device protocol files question?

[Emmanuel Mayssat <emayssat@epicsqt.org>]

The info you provide is confusing.
If your record is a longin, its value is an integer (not a string, not an error message, ...).
In your protocol, the out line is what the computer writes on the bus to fetch the status of the device.

Base on what I understand, you probably should use a binary out (bo record) for each of your batteries.
You can pass the battery number in the OUT line as a parameter to the protocol

record(bo,  $(prefix):$(number):BatteryOn")
{
    field(DTYP, ...
    field(out, "mydev.proto getStatus($prefix,$number)) dev)
}
record(stringin, $(prefix):$(number)Message")
{
}

with protocol
getStatus {
  out "Battery On \$2";
  in "OK";
 @mismatch {                                         
      out "Battery On \$2";
      in "%(\$1:\$2Message.VAL)s";               # Write on another PV                        
 }
}

The mismatch should not be required if you know all the allowed values for $number.
If that's the case, you just dbLoadRecords with the allowed $number parameters

I hope this helps.


--
Emmanuel Mayssat
http://www.epicsqt.org

---

From: steven.j.goff@boeing.com
To: tech-talk@aps.anl.gov
Subject: Stream device protocol files question?
Date: Wed, 17 Sep 2014 16:22:11 +0000

Hello,

 

I am trying to understand how to setup a particular command in a protocol file.

 

The command looks like this:

 

Battery On “number”

 

And the command returns either: “OK” or ”Error: err msg”.

 

 

I think my protocol file might look like this:

 

Battery

{

 Out “Battery On %d”;

}

 

And my db file would look like this:

 

Record (longin, “batteryOn”)

{

  Field(DTYP, “stream”)

  Field(INP, “myDev.proto Battery dev”)

}

 

 

How do I get the status that the command returns?

 

I want to do something like

 

Battery

{

  Out “Battery On %d”;

  In “%s”;

}

 

 

But I am already using an input for the battery number.  So how do I do both?

 

Thanks In advance.

 

Steve Goff