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Subject: Oxford/Danfysik power supply
From: Gournay Jean-Francois <Gournay@dapnia.cea.fr>
To: "'tech-talk@aps.anl.gov'" <tech-talk@aps.anl.gov>
Date: Tue, 18 Jan 2005 17:18:31 +0100
Title: Oxford/Danfysik power supply

Hello all,

I have to talk to the magnet power supply system 8000 from O.D.
Not surprisingly the controller has a clumsy protocol over a serial line.
After spending some time to fight with it, I am wondering if somebody has already developed something for it ?

If no, perhaps somebody can make some suggestions ...
1. Some commands give responses, some other not ... but drvAscii / drvSerial seems OK to accomodate this. What is not so nice is that I have a semTake error due to the timeout (the PS is connect to a vxWorks serial port and I am with R3.13) when I have no response from the PS which means no error !!! But OK I can live with this.

2. The most difficult problem I have is the following : I have to write DAC values with a string which looks like : <WA 999999> (999999 is an integer value with 6 digits). This command gives a response in a string.

I tried to implement this with an ao record with a flnk to a sub record and finally with a stringin record which talks to the PS. The idea is to modify the INP field of the stringin record in psDACProcess, to reflect the desired DAC value.

The DB looks like this :

record(ao, "PS_DAC_OUT_ao") {
        field(FLNK,"PS_DAC_sb")
}
record(sub,"PS_DAC_sb") {
        field(INAM,"psDACInit")
        field(SNAM,"psDACProcess")
}

record(stringin, "PS_DAC_OUT_si") {
   field(DESC,"PS DAC output I")
    field(DTYP,"Ascii SIO")
    field(INP,"@/tyCo/2 <WA 999999><%s>")  
}

The sub record works and I am able to reflect the desired value coming from the ao record in the INP field of the stringin record.

The problem is that the INP field of the stringin record is stored by devAscii at the init of the record and any subsequent changes are ignored when the record is processed.

Thans for any help.
Jean-François

J.F. Gournay
CEA Saclay
DAPNIA/SIS

tel +33 (0)1 69 08 70 32
fax +33 (0)1 69 08 63 01


Replies:
Re: Oxford/Danfysik power supply Dirk Zimoch

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