Experimental Physics and
Industrial Control System

haquin <[email protected]> · Tue, 27 Aug 2013 15:50:11 +0200

Hi all,

I have a soft IOC running on Linux PC, connected to a modbus TCP server using Asyn (v4.19) ModbusTCP (v2.4) driver,

EPICS R3.14.2.

in my IOC I run the two following records:
record(longin, tstRB) {
  field(SCAN, "I/O Intr")
  field(DTYP, "asynInt32")
  field(INP, "@asyn($(EQPT):Read_All 2)MODBUS_DATA")
  field(TPRO, "1")
}

record(longin, tstRB2) {
  field(SCAN, "I/O Intr")
  field(DTYP, "asynUInt32Digital")
  field(INP, "@asynMask($(EQPT):Read_All 2 0 0xFFFF )MODBUS_DATA")
  field(TPRO, "1")
}

Both records read the same register in the modbus table which I know is a constant value.

At execution time, I have the following messages for the record tstRB using asynInt32 but no messages related to tstRB2

using asynUInt32Digital:

cbLow: Process tstRB
cbLow: Process tstRB
cbLow: Process tstRB
cbLow: Process tstRB
cbLow: Process tstRB

If I use asynFloat64 iso asynInt32 I also have the messages,

I expected no messages in all cases since the read value is not changing, I didn't expected the behaviour to be DTYP

dependent ... Am I wrong ?

Regards

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n:Haquin;Christophe
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System