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<== Date ==> <== Thread ==>
Subject: Re: problem in communicating to the GPIB device with ASYN4-6
From: Eric Norum <[email protected]>
To: zhangdemin99 <[email protected]>
Cc: tech-talk <[email protected]>
Date: Thu, 2 Aug 2007 08:45:51 -0500
On Aug 2, 2007, at 5:51 AM, zhangdemin99 wrote:

Dear all,
  There are something wrong when  I run the application, and it says:
#!../../bin/linux-x86/PSM6003
 ##You may have to change PSM6003 to something else
 ##everywhere it appears in this file
 #<envPaths
 ##Register all support components
 dbLoadDatabase("../../dbd/PSM6003dbd",0,0)
 PSM6003_registerRecordDeviceDriver(pdbbase)
 ##Load record instances
 dbLoadRecords("../../db/psm6003.db","P=PSM6003:,R=,L=0,A=0")
drvAsynSerialPortConfigure("L0","/dev/ttyS0",0,0,0)
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")
I suggest that you set the end-of-string values here rather than in the devGpib command table entries. For example:
asynOctetSetInputEos("L0",-1,"\n")
asynOctetSetOutputEos("L0",-1,"\n")


asynSetTraceMask("L0",-1,0x9)
asynSetTraceIOMask("L0",-1,0x2)
iocInit()
Starting iocInit
############################################################
##EPICS R3.149-$R3-14-9-prel $2006/11/20 21:09:36$
##EPICS Base built May 13 2007
############################################################
The CA server's beacon address list was empty after initilization?
iocInit:All initilization complete
##start any sequence programs
#seq sncPSM6003,"user=zhm"
epics>2007/08/02 16:18:38.422 /dev/ttyS0 write 15
DISPlay:TEXT?LF
2007/08/02 16:18:48.422 display-query read status ""nin 0
2007/08/02 16:18:48.422 display-query error.


I have declared the command array as follows:
{&DSET_SO,GPIBWRITE,IB_Q_LOW,0,"DISPlay:TEXT \"%S""EOSNL, 0,200,0,0,0,0,0,EOSNL},
1) You need to use a lower-case character for the format string.
2) As mentioned above, it is better to set the end-of-string values elsewhere. With these changes the command table entry becomes:
{&DSET_SO,GPIBWRITE,IB_Q_LOW,NULL,"DISP:TEXT \"%s"",0,200,NULL, 0,0,NULL,NULL,NULL}


{&DSET_SI,GPIBREAD,IB_Q_LOW,"DISPlay:TEXT?"EOSNL,0,0,200,readString, 0,0,0,0,EOSNL}
You don't need a custom conversion function. The following should work:
&DSET_SI,GPIBREAD,IB_Q_LOW,"DISP:TEXT?","%39[^\r\n]",0,200,NULL, 0,0,NULL,NULL,NULL}


static int readString(gpibDpvt *pdpvt,int P1, int P2,char **P3)
{stringinRecord *prec=(stringinRecord*)pdpvt->precord;
 strncpy(pre->val,pdpvt->msg,sizeof(prec->val));
 prec->val[sizeof(prec->val)-1]=0;
 return(0);
}

Who can give me any suggestion?
many thanks in advance.

zhang demin






劲 爆 150 万 同 时 在 线，众 人 追 捧 梦 幻 西 游 

--
Eric Norum <[email protected]>
Advanced Photon Source
Argonne National Laboratory
(630) 252-4793



Replies:
Re: problem in communicating to the GPIB device with ASYN4-6 Emmanuel Mayssat
References:
problem in communicating to the GPIB device with ASYN4-6 zhangdemin99
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