Experimental Physics and
Industrial Control System
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| <== Date ==> | <== Thread ==> |
|---|
| Subject: | Reading multiple parameters from an incoming message. |
| From: | "Li, Ji via Tech-talk" <tech-talk at aps.anl.gov> |
| To: | "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov> |
| Date: | Thu, 24 Dec 2020 17:04:45 +0000 |
|
Hi,
I'm working on an EPICS package for a Harvard Pump 33 DDS syringe pump using streamdevice protocols. I need to read several parameters from an incoming message that combines the status of two axes/syringes, which has the following format:
RATEA TIMEA VOLA STATUSA
RATEB TIMEB VOLB STATUSB
RATEA/B, TIMEA/B and VOLA/B are integers, and STATUSA/B are 6-character strings with each character indicating a specific status.
I'm trying to parse the message using multiple protocols and records. For RATEA, only grab the first integer:
Protocol:
=======================
getStatusRateAxA {
out "status";
in "%d %*d %*d %*c%*c%*c%*c%*c%*c\n%*d %*d %*d %*c%*c%*c%*c%*c%*c\n" $ax_status;
}
=======================
Record:
=======================
record(ai, "$(P){$(Q)-Ax:A}:RATE:RBV") {
field(DESC, "Axis A rate readback")
field(DTYP, "stream")
field(INP, "@pump33dds.proto getStatusRateAxA($(P), $(Q), $(CMD)) $(PORT)")
field(PREC, "0")
}
=======================
The .substitutions file referring to this record was loaded without errors. When I tried to retrieve status information, the IOC shell printed the following information without errors:
=======================
epics> 2020/12/24 11:29:06.797 /dev/ttyUSB0 write 8
status\r\n
2020/12/24 11:29:06.833 /dev/ttyUSB0 read 71
50000000000 0 22307784 w...I.\n83333333330 24723 2055394602192 i...I.\n::
=======================
"::" in the incoming message should be parsed by "$ax_status" in the protocol and it worked for other messages.
The PV was showing INVALID(UDF_ALARM). Since the IOC didn't throw errors, I suppose the message was parsed correctly. How could this alarm have been caused?
Best,
-Ji Li
|
- Replies:
- Re: Reading multiple parameters from an incoming message. Mark Rivers via Tech-talk
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