Experimental Physics and
Industrial Control System

Hi,

I'm seeing this error on my IOC shell:

epics> Illegal choice PV: BL7:Det:PMT001:Stat.DTYP error detected in routine: dbFastLinkConv(cvt_device_st)

where:

epics> dbpr BL7:Det:PMT001:Stat,2
A: 0                ACKS: NO_ALARM      ACKT: YES           ADEL: 0
ASG:                B: 0                BKPT: 00            C: 1
CALC: (A!=0)||(B!=0)||(C!=1)            D: 0                DESC: HV Base Status
DISA: 0             DISP: 0             DISS: NO_ALARM      DISV: 1
DTYP: <nil>         E: 0                EGU:                EVNT: 0
F: 0                FLNK:CONSTANT 0     G: 0                H: 0
HHSV: NO_ALARM      HIGH: 0             HIHI: 0             HOPR: 0
HSV: NO_ALARM       HYST: 0             I: 0
INPA:CA_LINK BL7:Det:PMT001:Volt.STAT CP NMS
INPB:CA_LINK BL7:Det:PMT001:Curr.STAT CP NMS
INPC:CA_LINK BL7:Det:Asyn.CNCT CP NMS   INPD:CONSTANT       INPE:CONSTANT
INPF:CONSTANT       INPG:CONSTANT       INPH:CONSTANT       INPI:CONSTANT
INPJ:CONSTANT       INPK:CONSTANT       INPL:CONSTANT       J: 0
K: 0                L: 0                LCNT: 0             LLSV: NO_ALARM
LOLO: 0             LOPR: 0             LOW: 0              LSV: NO_ALARM
MDEL: 0             NAME: BL7:Det:PMT001:Stat               NSEV: NO_ALARM
NSTA: NO_ALARM      PACT: 0             PHAS: 0             PINI: NO
PREC: 0             PRIO: LOW           PUTF: 0             RPRO: 0
SCAN: Passive       SDIS:CONSTANT       SEVR: NO_ALARM      STAT: NO_ALARM
TIME: 2013-06-13 12:11:11.138031191     TPRO: 0             TSE: 0
TSEL:CONSTANT       UDF: 0              VAL: 0


So, my calc record doesn't have any registered device support, which I think is correct because there is no device support for the calc record (?)

I'm wondering why the error is printed, or even if it should be. It's printed whenever I try to read DTYP over channel access, like:

[mkp@DASDEV1 ~]$ caget BL7:Det:PMT001:Stat.DTYP
CA.Client.Exception...............................................
    Warning: "Channel read request failed"
    Context: "op=0, channel=BL7:Det:PMT001:Stat.DTYP, type=DBR_TIME_STRING, count=1, ctx="read failed""
    Source File: ../getCopy.cpp line 92
    Current Time: Thu Jun 13 2013 13:46:12.759397671
..................................................................
Read operation timed out: some PV data was not read.
BL7:Det:PMT001:Stat.DTYP

Shouldn't it just return 0, or None, rather than returning an error?

I only noticed it because I have a script that was reading the DTYP field on a set of records. Normally, I guess it doesn't matter since reading DTYP on a calc record doesn't mean much.

Cheers,
Matt