SYNOPSIS
void modbus_set_byte_timeout(modbus_t *ctx, uint32_t to_sec, uint32_t to_usec);
DESCRIPTION
The modbus_set_byte_timeout() function shall set the timeout interval between
two consecutive bytes of the same message. The timeout is an upper bound on the
amount of time elapsed before select() returns, if the time elapsed is longer
than the defined timeout, an ETIMEDOUT
error will be raised by the
function waiting for a response.
The value of to_usec argument must be in the range 0 to 999999.
If both to_sec and to_usec are zero, this timeout will not be used at all. In this case, modbus_set_response_timeout() governs the entire handling of the response, the full confirmation response must be received before expiration of the response timeout. When a byte timeout is set, the response timeout is only used to wait for until the first byte of the response.
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 to_usec is larger than 1000000.
AUTHORS
The libmodbus documentation was written by Stéphane Raimbault <stephane.raimbault@gmail.com>