Solvline PB2xxxUG - Manual (Page 82)

U_check_dcd
Check Signal
Description The function detects a change of DCD signal in MSR (Modem status
register) of serial file descriptor.
Synopsis int U_check_dcd (int fd)
Parameters fd : Serial file descriptor
Returns 0 : If DCD signal status is OFF
1 : If DCD signal status is ON
U_check_type
Check Serial Type
Description The function detects a serial interface from serial file descriptor.
Synopsis int U_check_type (int fd)
Parameters fd : Serial file descriptor
Returns 0 : If serial interface is RS-232
1 : If serial interface is RS-422
2 : If serial interface is RS-485
U_connect
TCP Connect
Description This function is used to create a connection to a established connection-
based (stream) foreign association. It blocks, up to the specified timeout
interval.
Synopsis int U_connect (char *dest_ip, int dest_socket, int timeout)
Parameters dest_ip : Pointer to the peer IP address to connect
dest_socket : Socket port number
Timeout : A maximum interval to wait for the connection in second
Returns -1 : On failure
1~n : A descriptor that references the socket if successful
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