Experimental Physics and
Industrial Control System

Dirk Zimoch <[email protected]> · Mon, 19 Feb 2018 17:59:16 +0100

Hello Li Xing,

I suggest to use a numeric record to receive the numbers, either longin

if you want the integer or ai if you want to convert (scale) the integer

to a double.

For clarifications: Do you send "\xFE\x04\x00\x00\x00\x01\x25\xC5" (8

bytes) or " fe 04 00 00 00 01 25 c5 " (string with 25 chars coding for 8

hex numbers)?

From your protocol I assume that you have 8 raw bytes, not a hex string.

To read 2 raw bytes as an integer use "%2r" (big endian signed) or

"%02r" (big endian unsigned), "%#2r" (little endian signed) or "%#02r"

(little endian unsigned). I assume big endian unsigned for now.

record(longin, "TEM") {
      field(DESC, "test for upstairs tcpip")
      field(DTYP, "stream")
      field(INP,  "@devtemp.proto get_high $(PORT) $(A)")
}

get_tem {
     MaxInput = 7;
     out "\xFE\x04\x00\x00\x00\x01\x25\xC5";
     in 0xfe 0x04 0x02 "%02r" 0xae 0x22;
}

This should give you 1032.

I assuming the input always starts with 0xfe 0x04 0x02 and always ends

with 0xae 0x22. If the last two bytes are some sort of checksum consider

the %<...> formats.

I set MaxInput = 7; to avoid delays from readTimeout because you have no

terminator and seem to have fixed input length of 7 bytes.

Dirk

On 16.02.2018 11:27, l123173 wrote:

Hi all,
      I have a simple question about stream.

      The device was connected with LAN. If sending " fe 04 00 00 00 01

25 c5 " in Hex,  getting  " fe 04 02 04 08 ae 22 " in Hex.

      Among the getting bytes（ " fe 04 02 04 08 ae 22 "）, 04 08 was I

wanted. Convert  0408(HEX) to decimal was 1032 (4*16**2 +8=1032), and

1032 was the finall result I wanted.

     In my programe, I have successfully sent and got the bytes. But I

could not get the 1032, I want to achieve it using scalcout, but failed.

     Could you please give me some suggestion.
     The environment I use, base3.14.12.7, synapps_5_8, fedora 27(64).

my db file:
--------------------------------------------
record(stringin, "GET_HIGH")
{
     field(DESC, "test for upstairs tcpip")
     field(DTYP, "stream")
     field(INP,  "@devtemp.proto get_high $(PORT) $(A)")
}

record(stringin, "GET_LOW")
{
     field(DTYP, "stream")
     field(INP,  "@devtemp.proto get_low $(PORT) $(A)")
     field(SCAN, "I/O Intr")
}

record(scalcout, "TEM")
{
     field(DESC, "get the temperature")
     field(DTYP, "stream")
     field(INPA, "GET_HIGH")
     field(INPB, "GET_LOW")
     field(CALC, "A*16*16 + B")
}

my proto file:
-------------------------------------------------------
get_high {
    out "\xFE\x04\x00\x00\x00\x01\x25\xC5";
    in "%*c%*c%*c%*c%*c%*c%c%c%*c%*c%*c%*c%*c%*c";
#   in "%s";
}

get_low {
    in "%*c%*c%*c%*c%*c%*c%*c%*c%c%c%*c%*c%*c%*c";
}

output of  st.cmd: (there is an error "Record "TEM" is of unknown type

"scalcout" )

------------------------------------
#!../../bin/linux-x86_64/temp
## You may have to change temp to something else
## everywhere it appears in this file
< envPaths
epicsEnvSet("ARCH","linux-x86_64")
epicsEnvSet("IOC","ioctemp")
epicsEnvSet("TOP","/home/lyx/tem_setup_with_asyn_scpi")
epicsEnvSet("EPICS_BASE","/opt/epics/base")
epicsEnvSet("ASYN","/opt/epics/synApps_5_8/support/asyn-4-26")
epicsEnvSet("STREAM","/opt/epics/synApps_5_8/support/stream-2-6a")
epicsEnvSet "STREAM_PROTOCOL_PATH"  "/home/lyx/tem_setup_with_asyn_scpi/db"
epicsEnvSet "P" "P"
epicsEnvSet "R" "T"
cd "/home/lyx/tem_setup_with_asyn_scpi"
## Register all support components
dbLoadDatabase "dbd/temp.dbd"
temp_registerRecordDeviceDriver pdbbase
drvAsynIPPortConfigure("L0","192.168.215.120:10000",0,0,0)
asynSetTraceIOMask("L0",-1,0x2)
asynSetTraceMask("L0",-1,0x9)
## Load record instances
dbLoadRecords("/home/lyx/tem_setup_with_asyn_scpi/db/devtemp.db","P=P,R=T,PORT=L0,A=0,user=lyxHost")
Record "TEM" is of unknown type "scalcout"

Error at or before ")" in file

"/home/lyx/tem_setup_with_asyn_scpi/db/devtemp.db" line 25

cd "/home/lyx/tem_setup_with_asyn_scpi/iocBoot/ioctemp"
iocInit
Starting iocInit
############################################################################
## EPICS R3.14.12.7
## EPICS Base built Feb  7 2018
############################################################################

Regards,
Li xing

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System