Hi Kaz,
Do you need to use the devXxStrParm device support? Why not use StreamDevice for this? devXxStrParam.c is limited to using stringout records, it does not support waveform records. I consider devXxStrParam to be obsolete, it is ~20 years old with no significant changes in the last 12 years.
StreamDevice can use waveform records, and so does not have a 40 character limit.
Mark
________________________________________
From: [email protected] [[email protected]] on behalf of Gofron, Kazimierz [[email protected]]
Sent: Thursday, May 12, 2016 9:23 PM
To: [email protected]
Subject: long string command to device
Hi,
I am writing EPICS driver for Keithley 3706A, and am trying to figure out how to send long string commands to the 3706A.
The ICL commands have no short version, and some commands exceed current 40 char length limit of the stringout record.
____
The EPICS stringoutRecord.h is limited to 40 char.
char val[40]; /* Current Value */
****
In my driver assigning to stringout:
"dmm.setconfig('1019:1020','fourwireohms')"
results in "dmm.setconfig('1019:1020','fourwireohms" being send - missing last 2 characters
Is there a replacement for stringout with relaxed limit?
----------------
Simplified command/respond test:
record(stringout, "$(P)$(Dmm)command") {
field(FLNK, "$(P)$(Dmm)reply")
}
record(stringin, "$(P)$(Dmm)reply") {
field(DTYP, "asynOctetWriteRead")
field(INP, "@asyn($(PORT) 0) $(P)$(Dmm)command")
}
------------------
I am currently using this format in the driver:
record(stringout, "$(P)$(Dmm)dmm_read") {
field(DTYP, "asyn so stringParm")
field(FLNK, "$(P)$(Dmm)dmm_get_str.VAL PP MS")
field(VAL, "print(dmm.measure())")
field(OUT, "@asyn($(PORT))TERM=0a")
}
record(stringin, "$(P)$(Dmm)dmm_get_str") {
field(DTYP, "asyn si stringParm")
field(INP, "@asyn($(PORT))TERM=0a,TO=10000")
field(FLNK, "$(P)$(Dmm)read_finished.VAL PP MS")
}
Kazimierz
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