Experimental Physics and
Industrial Control System

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<== Date ==>		<== Thread ==>

Subject:	modbus Write operation
From:	Vishnu Patel via Tech-talk <[email protected]>
To:	"[email protected]" <[email protected]>
Date:	Tue, 22 Oct 2019 09:47:25 +0000

Hi,

I would like to write using modbusRTU EPICS Driver.

(1)I used write function for "write multiple coils (15)" modbus function.

drvModbusAsynConfigure("DACD_AMT_EU1_WRITE_MB_0000", "DACD_AMT_EU1", 1, 15, 0, 32, 0, 100, "EU")

The function error output below.

2019/10/22 14:58:49.789 drvModbusAsyn::doModbusIO port DACD_AMT_EU1_WRITE_MB_0000 error calling writeRead, error=, nwrite=6/6, nread=0

(2) With holding register(03) READ function is ok.

But write gives an error as below

2019/10/22 15:11:41.117 drvModbusAsyn::doModbusIO port DACD_AMT_EU1_RW_MW_11000 error calling writeRead, error=, nwrite=6/6, nread=0

iocRun: All initialization complete

epics> 2019/10/22 15:12:20.517 drvModbusAsyn::writeUInt32D port DACD_AMT_EU1_RW_MW_11000 invalid request for Modbus function 3

2019/10/22 15:12:20.517 DACD_AMT_W_FR1 devAsynUInt32Digital::processCallbackOutput process error

I am reading and write Holding Register 11000 using longin & longout record.

file "../../db/longin.template" { pattern

{P, R, PORT, OFFSET, SCAN}

{DACD_AMT_, R_FR1, DACD_AMT_EU1_RW_MW_11000, 0, "I/O Intr"}

}

file "../../db/longout.template" { pattern

{P, R, PORT, OFFSET}

{DACD_AMT_, W_FR1, DACD_AMT_EU1_RW_MW_11000, 0}

I am not able to write "multiple coils" function and "write holding register" .

Thanks

Vishnu

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ANJ, 22 Oct 2019