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MODBUS_NEW_TCP_PI(3) | Libmodbus Manual | MODBUS_NEW_TCP_PI(3) |
NAME¶
modbus_new_tcp_pi - create a libmodbus context for TCP Protocol IndependentSYNOPSIS¶
modbus_t *modbus_new_tcp_pi(const char *node, const char * service);DESCRIPTION¶
The modbus_new_tcp_pi() function shall allocate and initialize a modbus_t structure to communicate with a Modbus TCP IPv4 or Ipv6 server.RETURN VALUE¶
The modbus_new_tcp_pi() function shall return a pointer to a modbus_t structure if successful. Otherwise it shall return NULL and set errno to one of the values defined below.ERRORS¶
EINVALThe node string is empty or has been
truncated. The service string is empty or has been truncated.
EXAMPLE¶
modbus_t *ctx; ctx = modbus_new_tcp_pi("::1", "1502"); if (ctx == NULL) { fprintf(stderr, "Unable to allocate libmodbus context\n"); return -1; } if (modbus_connect(ctx) == -1) { fprintf(stderr, "Connection failed: %s\n", modbus_strerror(errno)); modbus_free(ctx); return -1; }
SEE ALSO¶
modbus_new_tcp(3) modbus_new_rtu(3) modbus_free(3)AUTHORS¶
The libmodbus documentation was written by Stéphane Raimbault < stephane.raimbault@gmail.com[1]>NOTES¶
- 1.
- stephane.raimbault@gmail.com
mailto:stephane.raimbault@gmail.com
05/26/2012 | libmodbus 3.0.3 |