Experimental Physics and
Industrial Control System

boj via Tech-talk <tech-talk at aps.anl.gov> · Fri, 22 Sep 2023 12:15:14 +0200

Dear all

I am implementing a very simple serial communication IOC, where each

call to the instrument returns all relevant values.

The StremDevice manual suggests to use "I/O Intr" record processing.

The database, protocol and startup file is given below.

The "V" record is processed as expected, but the "Time" record is never

updated. If i enable "SCAN, "5 second""  for the "Time" record this also

works so the protocol is returning valid (using the same out string as

for the "V" record.

Am I overlooking something here , or is there anyway to debug why the

record is not processed?

I am running the 3.15 branch of EPICS , under linux using a soft ioc

Thanks in advance for any hints

Bo

** Database file: ENG110_test.db:

record(ai, "$(BASE):V") {
  field(DTYP, "stream")
  field(INP, "@ENG110_test.proto GetV asynstream1")
  field(SCAN, "5 second")
}

record(ai, "$(BASE):Time") {
  field(DTYP, "stream")
  field(INP, "@ENG110_test.proto GetTime asynstream1")
  field(SCAN, "I/O Intr")

** Protocol file ENG110_test.proto:

ExtraInput = Ignore;

GetV {
  out "\x02\x05\x95\x61\x03";
  in "%*9r%#4R";
};

GetTime {
        in "%*9r%*#4R%*#4R%*#4R%*#4R%*#4R%*#4R%#4R";
};

** Startup file

## Register all support components
dbLoadDatabase("/usr/lib/epics/dbd/stream-Ioc.dbd",0,0)
stream_Ioc_registerRecordDeviceDriver(pdbbase)

#Specify the TCP endpoint and give your 'bus' an arbitrary name eg.

"asynstream1".

drvAsynSerialPortConfigure("asynstream1", "/dev/ttyUSB0",0,0,0)
asynSetOption("asynstream1",-1,"baud","9600")
asynSetOption("asynstream1",-1,"bits","8")
asynSetOption("asynstream1",-1,"parity","none")
asynSetOption("asynstream1",-1,"stop","1")
asynSetOption("asynstream1",-1,"clocal","Y")
asynSetOption("asynstream1",-1,"crtscts","N")

## Load record instances for 8 channel module
dbLoadRecords("ENG110_test.db","BASE=IntLab2:ENG110")

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System