Hi all,
I have a python program( xxx.py ), which simulate a hardware( actually it was prepared for a can bus device ). The xxx.py uses TCP protocols.
The xxx.py would produce data, I intend to do the comunication with PC-linux and epics using xxx.py.
I means ask IOC get the value produced by xxx.py.
the xxx.py send and receive message like these:
sending msg: b'\x05\x03\x01\x04A\x00\x00\x00W\x19'
receiving msg: b'\x05\x03\x02\x04@\xe0\x00\x00W ' # 7 byte?
sending msg: b'\x05\x03\x02\x04A\x10\x00\x00V\xef'
receiving msg: b'\x05\x03\x01\x04A\x00\x00\x00W\x19' # 8 byte?
sending msg: b'\x05\x03\x01\x04A \x00\x00V\xd3'
receiving msg: b'\x05\x03\x02\x04A\x10\x00\x00V\xef'
sending msg: b'\x05\x03\x02\x04?\x80\x00\x00N\xea'
receiving msg: b'\x05\x03\x01\x04A \x00\x00V\xd3'
sending msg: b'\x05\x03\x01\x04@\x00\x00\x00V\xe5'
receiving msg: b'\x05\x03\x02\x04?\x80\x00\x00N\xea'
sending msg: b'\x05\x03\x02\x04@@\x00\x00W\x02'
receiving msg: b'\x05\x03\x01\x04@\x00\x00\x00V\xe5' # has some strange character?
sending msg: b'\x05\x03\x01\x04@\x80\x00\x00W\r'
receiving msg: b'\x05\x03\x02\x04@@\x00\x00W\x02'
sending msg: b'\x05\x03\x02\x04@\xa0\x00\x00V\xf4'
receiving msg: b'\x05\x03\x01\x04@\x80\x00\x00W\r'
sending msg: b'\x05\x03\x01\x04@\xc0\x00\x00V\xd9'
receiving msg: b'\x05\x03\x02\x04@\xa0\x00\x00V\xf4'
Question:
I created an example ioc, added the db and proto, added " drvAsynIPPortConfigure("PS1","127.0.0.1:9011") " and STREAM_PROTOCOL_PATH in st.cmd.
--db file:
record(ai, "temperature")
{
field(DESC, "temperature in tank")
field(DTYP, "stream")
field(INP, "@HSPY.proto GetTem PS1")
field(EGU, "degree")
field(SCAN, "1 second")
}
--proto file:
Terminator = LF;
GetTem {
in "%*2r%r%*4r";
ExtraInput = Ignore;
}
Then I got in IOC:
---epics> dbpr temperature
ASG: DESC: temperature in tank DISA: 0
DISP: 0 DISV: 1 NAME: temperature RVAL: 0
SEVR: INVALID STAT: UDF SVAL: 0 TPRO: 0
VAL: 0
---epics> dbtr temperature
record active
Question：
1) Another better tool than stream device?
2) Does the proto I the right?
3) why my temperatre pv was invalid undefined?
4) the received message was not so regular, stream device suitable?
Could someone do me a favor. ioc was run in unbuntu PC, epics was 7.0.x.
Thanks,
Liang
