For what it's worth: the code I use now to fetch the status from the modbus slave and module to check afterwards if my communication is OK. Smaal notice, I use a TCP/RTU convertor so I have to check both statussen, one for the TCP connection, one for the RS485 connection.
The code is probably subject for improvement, so advice is always welcome.
Code:
classdef Da1 BaseFcXylem;
static pwr_tStatus sts = 0;
static pwr_tStatus *status1 = 0;
static pwr_tStatus *status2= 0;
if (sts == 0 && status1 == 0 && status2 == 0) {
pwr_tAName aname1;
pwr_tAName aname2;
char *s;
pwr_tAttrRef aref;
// Get name of a channel and replace the channel with SendOp
sts = gdh_AttrrefToName( &Da1->ErrorWordSW.SigChanCon, aname1, sizeof(aname1), cdh_mName_volumeStrict);
if (ODD(sts) ){
s = strrchr(aname1, '-'); // or '-' if channel is child
if (s)
*s = 0;
strcpy(aname2,aname1);
strcat(aname1, ".Status");
s = strrchr(aname2, '-');
if (s)
*s = 0;
strcat(aname2, ".Status");
sts = gdh_NameToAttrref(pwr_cNObjid, aname1, &aref);
if (ODD(sts))
sts = gdh_AttrRefToPointer(&aref, (void **)&status1);
sts = gdh_NameToAttrref(pwr_cNObjid, aname2, &aref);
if (ODD(sts))
sts = gdh_AttrRefToPointer(&aref, (void **)&status2);
}
}
if (status1 && status2 && ODD(sts)){
OI1 = (int) *status1; // status module
OI2 = (int) *status2; // status slave
}
