Experimental Physics and
Industrial Control System

Zenon Szalata <[email protected]> · Thu, 11 Jul 2013 09:07:43 -0700

Hi Mark,

I have a handful of bo records, which are intended to initiate some

action in a device driver sub-classed from asynPortDriver. I want these

records to have VAL 0 when the IOC starts. A typical record looks like

this:

record( bo,"$(P):BO:$(MOD):CH$(N):STOP"){
  field( DESC, "Stop:")
  field( DTYP, "asynInt32")
  field( OUT,  "@asyn($(PORT) $(ADDR) 1)BO_STOP")
  field( HIGH, "0.1")
  field( ZNAM, "Not")
  field( ONAM, "Yes")
  field( VAL,  "0")
}

When the IOC starts, these records have VAL=1, which is undesirable.

For testing I have created a soft channel bo record and it comes up with

the state consistent with what is in the VAL field. I suspect the

observed behavior has something to do with the "bumpless reboot" that

you mentioned in your last email to me. I must confess that I don't

understand the concept and more importantly how to avoid it, assuming

that is what is getting me.

I tried a few things in the device driver. I have captured the call in

readInt32 routine and set the return status to either asynSuccess or

asynError, which did not change the behavior. I have also added in the

constructor setIntegerParam( xxxx,0) for these records. This also did

not help. Could you put me on the right track with this?

Thanks in advance,
Zen

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System