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

[Fabian <epics@shony.de>]

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>