modbus_set_response_timeout(3) ============================== NAME ---- modbus_set_response_timeout - set timeout for response SYNOPSIS -------- *int modbus_set_response_timeout(modbus_t *'ctx', uint32_t 'to_sec', uint32_t 'to_usec');* DESCRIPTION ----------- 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. EXAMPLE ------- [source,c] ------------------- 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); ------------------- SEE ALSO -------- linkmb:modbus_get_response_timeout[3] linkmb:modbus_get_byte_timeout[3] linkmb:modbus_set_byte_timeout[3] AUTHORS ------- The libmodbus documentation was written by Stéphane Raimbault