Experimental Physics and
Industrial Control System

Hi,

You should not be using longout.template, that can only write a single 16-bit value to a single Modbus register.

You should be using longoutInt32.template.  That will write a 32-bit value to Modbus registers N and N+1.  

This is that template file.

corvette:modbus/modbusApp/Db>more longoutInt32.template 
# longout record template for register inputs
record(longout,"$(P)$(R)") {
    field(DTYP,"asynInt32")
    field(OUT,"@asyn($(PORT) $(OFFSET))$(DATA_TYPE)")
}

You need to set the $(DATA_TYPE) macro to either INT32_LE or INT32_BE, depending on whether the value should be stored with the least significant byte first (Little Endian = INT32_LE) or most significant byte first (Big Endian = INT32_BE).

Mark

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Fabian
Sent: Friday, August 31, 2012 11:40 AM
To: [email protected]
Subject: modbus R2-4 write 32bit int with modbus function 16

Hello all,

im trying to write a huge number which ist splitted into 2 Words (4
bytes) via modbus. But it doesn't work because I receive an asyn error.

epics> dbpf IOC01MINI8:RTC_SP 0
DBR_LONG:           0         0x0                
epics> 2012/08/31 18:14:45.105 drvModbusAsyn::writeUInt32D port
mini8_RTC_SP invalid request for Modbus function 16
2012/08/31 18:14:45.105 IOC01MINI8:RTC_SP devAsynUInt32Digital process
error

I use the longout.template as epics record, and got asyn 4-20
The configuration for the port is here:

#drvModbusAsynConfigure(portName,         tcpPortName, slaveAddress,    
modbusFunction, modbusStartAddress, modbusLength, dataType, pollMsec,
plcType);
drvModbusAsynConfigure("mini8_RTC_SP",        "mini8_1",     1,       
 16,          40293,          2,            6,      1000,   
 "EuroTherm-mini8") #0x9d65

*any ideas would be appreciated.*
<http://www.healthboards.com/boards/lung-respiratory-disorders-copd/834289-any-ideas-would-appreciated-post4676978.html?highlight=aware+of+my+breathing#4676978>

References:

modbus R2-4 write 32bit int with modbus function 16 Fabian

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