Re: PINI field not working with modbus

[Mark Rivers via Tech-talk <tech-talk@aps.anl.gov>]

Hi Marco,

Can you show us how the NEG_EMODBUS_1_1_Rd_VTarget port is configured?

Mark

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From: Tech-talk <tech-talk-bounces@aps.anl.gov> on behalf of Marco A. Barra Montevechi Filho via Tech-talk <tech-talk@aps.anl.gov>
Sent: Tuesday, July 26, 2022 7:45 AM
To: tech-talk@aps.anl.gov <tech-talk@aps.anl.gov>
Subject: PINI field not working with modbus

 

Hello all.

I have an analog in record for reading a modbus register from a device. The record is defined as follows:

record(ai, "${BL}:${H}:${EQ}:TargetVoltRead"){  

    field(DESC, "Voltage set on target [V].")

    field(DTYP, "asynInt32")

    field(EGU, "V")

    field(ASLO, 0.01)

    field(INP, "@asyn(NEG_EMODBUS_1_1_Rd_VTarget,0,1000)MODBUS_DATA")

    field(SCAN, "1 second")

}

Which reads fine. However, if i set the PINI field to YES and the scan to passive:

record(ai, "${BL}:${H}:${EQ}:TargetVoltRead"){  

    field(DESC, "Voltage set on target [V].")

    field(DTYP, "asynInt32")

    field(EGU, "V")

    field(ASLO, 0.01)

    field(INP, "@asyn(NEG_EMODBUS_1_1_Rd_VTarget,0,1000)MODBUS_DATA")

    field(SCAN, "Passive")

    field(PINI, "YES")

}

i get only 0 as value when cagetting the PV. Am i doing something wrong?

Thanks in advance.

Marco

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