K
Hi,
may be am am a little bit stupid. But I do not get any modbus information back from my new device.
These are the settings of the device:
I verified the port is open:
root@zentrale:~# nmap -p 502 192.168.22.60
Starting Nmap 7.70 ( https://nmap.org ) at 2021-09-26 14:55 CEST
Nmap scan report for 192.168.22.60
Host is up (0.18s latency).
PORT STATE SERVICE
502/tcp open mbap
Nmap done: 1 IP address (1 host up) scanned in 6.88 seconds
First I tried to use mbpoll to get information but mbpoll's syntax is somehow cryptic so I either got no results, an error or misleading results....
I tried then to do it with my own C code but failed as well.
#include "header.h"
#include "vars.h"
void main(int argc, char* argv[])
{
modbus_t *modbusglob;
union {
uint16_t word[2];
uint32_t dword;
float fl;
} wert;
int errlvl;
/********************************* Function **********************************/
void fieldbus_free(modbus_t *modbus)
{
if (modbus != NULL) {
modbus_close(modbus);
modbus_free(modbus);
}
}
/********************************* Function **********************************/
modbus_t * fieldbus_new(void)
{
int err;
modbus_t *modbus;
char host[15];
int port;
// strcpy(host,"127.0.0.1");
strcpy(host,"192.168.22.60");
port = 502;
modbus = modbus_new_tcp(host, port);
if (modbus == NULL )
{
fieldbus_free(modbus);
exit (55);
}
err = modbus_connect(modbus);
if (err == -1)
{
fieldbus_free(modbus);
modbus = NULL;
exit (55);
};
err=modbus_set_slave(modbus, 0);
if( err == -1)
{
fieldbus_free(modbus);
modbus = NULL;
exit (60);
} else {
return modbus;
}
}
/********************************* Main **********************************/
modbusglob=fieldbus_new();
errlvl=modbus_read_registers(modbusglob, 26, 2, (&wert.word[0]));
if (errlvl == -1) {printf("ERR1 modbus_read_register, %s\n",modbus_strerror(errno));}
else { printf("Register is set to %f\n",wert.fl);}
sleep(3);
errlvl=modbus_read_registers(modbusglob, 18, 2, (&wert.word[0]));
if (errlvl == -1) {printf("ERR2 modbus_read_register, %s\n",modbus_strerror(errno));}
else { printf("Register is set to %f\n",wert.fl);}
exit (0);
}
What I get after compile and start is a timeout:
root@zentrale:/heizung/src# ./neuron
ERR1 modbus_read_register, Connection timed out
ERR2 modbus_read_register, Connection timed out
I used register 26 and 18 for VOC-Index (foat32) and CO2 (float32).
Remark: As soon as I switch to "localhost" (and matching registers) instead of the device I am getting results...
What is wrong here?
And regarding mbpoll: someone having a working example for mbpoll/tcp?
THANKS a lot!
/KNEBB