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MODBUS_NEW_TCP(3) | Libmodbus Manual | MODBUS_NEW_TCP(3) |
NAME¶
modbus_new_tcp - create a libmodbus context for TCP/IPv4SYNOPSIS¶
modbus_t *modbus_new_tcp(const char *ip, int port);DESCRIPTION¶
The modbus_new_tcp() function shall allocate and initialize a modbus_t structure to communicate with a Modbus TCP/IPv4 server.RETURN VALUE¶
The modbus_new_tcp() 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¶
EINVALAn invalid IP address was given.
EXAMPLE¶
modbus_t *ctx; ctx = modbus_new_tcp("127.0.0.1", 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_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 |