Re: data format conversion

[Florian Feldbauer via Tech-talk <tech-talk at aps.anl.gov>]

Hey Chunxia,

you could try the following:

Statements in the db file:

  recorrd(ai, "$(P)$(R)read")

  {

        field(DESC, "read pressure")

        field(DTYP, "stream")

        field(INP, "@pressure.proto SendCommand(9)  $(PORT)")

        field(SCAN, "1 second")

}

Statements in the protocol file is like this: 

SendCommand{

    out $1;

    in "%f";

}

Without quotes, the variable is assumend to be the decimal value of one byte, so it will send one byte with value '9' to your device, just like "\x09" would do.

HTH,
Florian

Am 21.08.2020 um 03:43 schrieb yincx--- via Tech-talk:

Hello everyone,

I am using the stream device to gat data from a device, and have a problem about format conbersion.  I  hope to get some advice and will appreciate for your help.

I want to send data, such as "09", in hexademical format to the device.  the device will return  a float data %f.

Statements in the db file:

  recorrd(ai, "$(P)$(R)read")

  {

        field(DESC, "read pressure")

        field(DTYP, "stream")

        field(INP, "@pressure.proto SendCommand(09)  $(PORT)")

        field(SCAN, "1 second")

}

Statements in the protocol file is like this: 

SendCommand{

    out "\x\$1";

    in "%f";

}

when I run the st.cmd, an error occurs:

Hex digit expected after \x:  "\X""

if "09" is send directly, not as a variable "\$1":

SendCommand{

    out "\x09";

    in "%f";

}

everything goes well and I can get the returned %f correctly.

I wonder how can I send "09" as a variable?  How to change a variable in the record to be hexadecimal?

Thank you very much for any advice, I will try it and give feedback.

Bset wishes

Chunxia Yin

---

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