1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 <2017> 2018 2019 2020 2021 2022 2023 2024 | Index | 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 <2017> 2018 2019 2020 2021 2022 2023 2024 |
<== Date ==> | <== Thread ==> |
---|
Subject: | Re: modbus write 2 16 bits holding registers with modbus function 16 |
From: | Claudio Lambert <[email protected]> |
To: | Mark Rivers <[email protected]> |
Cc: | "[email protected]" <[email protected]> |
Date: | Fri, 23 Jun 2017 12:46:06 -0300 |
Hi Claudio,
> I'm using modbusR2-1.
OK, that explains the problem. That is a very old (2010) version, and you are trying to use features that are not available in that release.
This is the relevant code from writeInt32:
switch(pPlc->modbusFunction) {
case MODBUS_WRITE_SINGLE_COIL:
case MODBUS_WRITE_SINGLE_REGISTER:
status = doModbusIO(pPlc, pPlc->modbusSlave, pPlc->modbusFunction,
modbusAddress, &data, 1); if (status != asynSuccess) return(status);
break;
default:
asynPrint(pPlc->
pasynUserTrace, ASYN_TRACE_ERROR, "%s::writeInt32 port %s invalid request for Modbus"
" function %d\n",
driver, pPlc->portName, pPlc->modbusFunction);
return(asynError);
}
Note that writeInt32 does not support MODBUS_WRITE_MULTIPLE_
REGISTERS in that release.
You are also asking for data type 6=INT32_BE. But support for that data type was only added in R2-4, as documented in the release notes.
I suggest you update to the latest version, R2-9.
Mark
From: Claudio Lambert [mailto:[email protected]]
Sent: Friday, June 23, 2017 10:19 AM
To: Mark Rivers
Cc: [email protected]
Subject: Re: modbus write 2 16 bits holding registers with modbus function 16
Hi Mark,
I'm using modbusR2-1.The OS where EPICS run is GNU/Linux x86_64 and the compiler is gcc 4.4.3.
I made the correction in the noAutoConnect flag but the error persist.
As additional information, there is no error writing a single record (Function Code=6).
Thanks again,Claudio.
2017-06-23 11:47 GMT-03:00 Mark Rivers <[email protected]>:
Hi Claudio,
I don't understand that error message. What version of the EPICS Modbus package are you using?
In the latest version that error comes from this code starting at line 964 in drvModbusAsyn.c
switch(pPlc->modbusFunction) {
case MODBUS_WRITE_SINGLE_COIL:
buffer[0] = value;
status = doModbusIO(pPlc, pPlc->modbusSlave, pPlc->modbusFunction,
modbusAddress, buffer, 1); if (status != asynSuccess) return(status);
break;
case MODBUS_WRITE_SINGLE_REGISTER:
status = writePlcInt(pPlc, dataType, offset, value, buffer, &bufferLen);
if (status != asynSuccess) return(status);
for (i=0; i<bufferLen; i++) {
status = doModbusIO(pPlc, pPlc->modbusSlave, pPlc->modbusFunction,
modbusAddress+i, buffer+i, bufferLen); }
if (status != asynSuccess) return(status);
break;
case MODBUS_WRITE_MULTIPLE_
REGISTERS: case MODBUS_WRITE_MULTIPLE_
REGISTERS_F23: status = writePlcInt(pPlc, dataType, offset, value, buffer, &bufferLen);
if (status != asynSuccess) return(status);
status = doModbusIO(pPlc, pPlc->modbusSlave, pPlc->modbusFunction,
modbusAddress, buffer, bufferLen); if (status != asynSuccess) return(status);
break;
default:
asynPrint(pPlc->
pasynUserTrace, ASYN_TRACE_ERROR, "%s::writeInt32 port %s invalid request for Modbus"
" function %d\n",
driver, pPlc->portName, pPlc->modbusFunction);
return asynError;
}
So the error comes when it falls through the switch into the default: block. However, it is reporting that pPlc->modbusFunction is 16, which is what MODBUS_WRITE_MULTIPLE_
REGISTERS is defined to be in modbus.h.
#define MODBUS_WRITE_MULTIPLE_
REGISTERS 0x10
So it should have executed the case block above the default: section, not the default section.
What OS and compiler are you using?
Also, I notice something about this command in your startup script:
drvAsynIPPortConfigure("NOC02"
,"192.168.1.1:502",0,1,1) You have set the noAutoConnect flag. This is generally not a good idea, I would suggest changing this line to:
drvAsynIPPortConfigure("NOC02"
,"192.168.1.1:502",0,0,1) However, I don't think this is related to the problem you are having.
Mark
From: [email protected] [mailto:tech-talk-bounces@aps.
anl.gov ] On Behalf Of Claudio Lambert
Sent: Friday, June 23, 2017 9:05 AM
To: [email protected]
Subject: modbus write 2 16 bits holding registers with modbus function 16
Hi all, I'm trying to write 2 x 16 bits holding registers (N, N+1) at same time, but I'm obtaining the following error:
epics> dbpf NOC02:CMD_TEST 45
DBR_DOUBLE: 45
epics> 2017/06/23 10:40:51.678 drvModbusAsyn::writeInt32 port NOC_F16 invalid request for Modbus function 16
2017/06/23 10:40:51.678 NOC02:CMD_TEST devAsynInt32 process errorThis is the configuratión for the connection and record:
drvAsynIPPortConfigure("NOC02","192.168.1.1:502",0,1,1)
modbusInterposeConfig("NOC02",0,5000)
drvModbusAsynConfigure("NOC_F16", "NOC02", 1, 16, 2, 2, 6, 2000, "TTA")
record(longout,"NOC02:CMD_TEST") {
field(DTYP,"asynInt32")
field(OUT,"@asyn(NOC_F16 0)")
}
Any help would be appreciated.
Thanks in advance!