Experimental Physics and
Industrial Control System

Dirk Zimoch <[email protected]> · Tue, 16 Dec 2014 13:58:22 +0100

On 11.12.2014 02:47, Franklin Fuller wrote:

Hi all,

Question is: How can I changed the timeout for drvAsynSerialPort?
Context follows (maybe I'm asking the wrong question):

I've been working through a tutorial* with few modifications.  So far no
problems until I try to initiate communication with a Stanford Research
Systems PS365 HV supply.  When I run ./st.cmd, everything says it
initializes, but then I get a message saying that the ioc did not
receive a response within 1 second.  The exact error(s) are:

2014/12/10 17:31:18.937952 L0 ps365controlTestIDN: No reply from device
within 1000 ms

2014/12/10 17:31:20.039439 L0 ps365controlTestIDNwf: No reply from
device within 1000 ms

http://epics.web.psi.ch/software/streamdevice/doc/protocol.html#sysvar

ReplyTimeout = 5000;

Further, if I query the ioc with "caget -S ps365controlTestIDNwf", I get
this:

ps365controlTestIDNwf \003

CA.Client.Exception...............................................
     Warning: "Identical process variable names on multiple servers"
     Context: "Channel: "ps365controlTestIDNwf", Connecting to:
198.128.196.226:5064 <http://198.128.196.226:5064>, Ignored:
franklins-mbp.dhcp.lbl.gov:5064 <http://franklins-mbp.dhcp.lbl.gov:5064>"
     Source File: ../cac.cpp line 1298
     Current Time: Wed Dec 10 2014 17:44:31.920218000

I can "manually" communicate with the device using a simple screen
command.  I use the same port address with 9660/8/N/1 standard settings.
It seems to take a second, maybe 2, to open the connection.  So my
thought was that maybe I just need to have the asyn driver increase its
timeout time to avoid this error.

I can't see a way to change the timeout, however.

* The tutorial in question:
http://www.aps.anl.gov/epics/modules/soft/asyn/R4-21/HowToDoSerial/HowToDoSerial_StreamDevice.html

My st.cmd is given below:

#!../../bin/darwin-x86/ps365controlTest

##########################################
# Setup Environment
< envPaths
epicsEnvSet "STREAM_PROTOCOL_PATH" "$(TOP)/db"

##########################################
# Allow PV prefixes and serial port name to be set from the environment
epicsEnvSet "P" "$(P=ps365control)"
epicsEnvSet "R" "$(R=Test)"
epicsEnvSet "TTY" "$(TTY=/dev/ttyUSB)"

##########################################
# Register all support components
cd ${TOP}
dbLoadDatabase(dbd/ps365controlTest.dbd)
ps365controlTest_registerRecordDeviceDriver(pdbbase)

##########################################
# Set up ASYN ports
drvAsynSerialPortConfigure("L0","$(TTY)",0,0,0) #sets up a port L0 at
$TTY (see above)
#now we fill in the details of the port connection
#9600/8/N/1 is the most typical serial port configuration
asynSetOption("L0",-1,"baud","9600"
asynSetOption("L0",-1,"bits","8")
asynSetOption("L0",-1,"parity","none")
asynSetOption("L0",-1,"stop","1")
asynSetOption("L0",-1,"clocal","Y")
asynSetOption("L0",-1,"crtscts","N")

##########################################
## Load record instances
dbLoadRecords("db/devps365control.db","P=$(P),R=$(R),PORT=L0,A=0")

##########################################
# Start EPICS
cd ${TOP}/iocBoot/${IOC}

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System