modbus_set_byte_timeout(3) ========================== NAME ---- modbus_set_byte_timeout - set timeout between bytes 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. SEE ALSO -------- linkmb:modbus_get_byte_timeout[3] linkmb:modbus_get_response_timeout[3] linkmb:modbus_set_response_timeout[3] AUTHORS ------- The libmodbus documentation was written by Stéphane Raimbault