debian man page for modbus_new_tcp_pi

Query: modbus_new_tcp_pi

OS: debian

Section: 3

Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar

MODBUS_NEW_TCP_PI(3)						 Libmodbus Manual					      MODBUS_NEW_TCP_PI(3)

NAME
modbus_new_tcp_pi - create a libmodbus context for TCP Protocol Independent
SYNOPSIS
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. The node argument specifies the host name or IP address of the host to connect to, eg. 192.168.0.5 , ::1 or server.com. The service argument is the service name/port number to connect to. To use the default Modbus port use the string "502". On many Unix systems, it's convenient to use a port number greater than or equal to 1024 because it's not necessary to have administrator privileges.
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
EINVAL The 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 "); return -1; } if (modbus_connect(ctx) == -1) { fprintf(stderr, "Connection failed: %s ", 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 Stephane Raimbault <stephane.raimbault@gmail.com[1]>
NOTES
1. stephane.raimbault@gmail.com mailto:stephane.raimbault@gmail.com libmodbus 3.0.3 05/26/2012 MODBUS_NEW_TCP_PI(3)
Related Man Pages
modbus_get_response_timeout(3) - debian
modbus_mapping_new(3) - debian
modbus_read_input_registers(3) - debian
modbus_reply_exception(3) - debian
modbus_set_slave(3) - debian
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