modbus_set_response_timeout3
Set timeout for response
Usage
int modbus_set_response_timeout(modbus_t *ctx, uint32_t to_sec, uint32_t to_usec);
Overview
The modbus_set_response_timeout() function shall set the timeout interval used to wait for a response. When a byte timeout is set, if elapsed time for the first byte of response is longer than the given timeout, an ETIMEDOUT error will be raised by the function waiting for a response. When byte timeout is disabled, the full confirmation response must be received before expiration of the response timeout.
The value of to_usec argument must be in the range 0 to 999999.
Return value
The function shall return 0 if successful. Otherwise it shall return -1 and set errno.
Errors
EINVAL
The argument ctx is NULL, or both to_sec and to_usec are zero, or to_usec is larger than 1000000.
Examples
uint32_t old_response_to_sec; uint32_t old_response_to_usec; /* Save original timeout */ modbus_get_response_timeout(ctx, &old_response_to_sec, &old_response_to_usec); /* Define a new timeout of 200ms */ modbus_set_response_timeout(ctx, 0, 200000);
Releases
6 releases since Debian 7 (Wheezy); the text changed 5 times.