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MODBUS_SET_RESPONSE_(3) libmodbus Manual MODBUS_SET_RESPONSE_(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 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 modbus_get_response_timeout(3) modbus_get_byte_timeout(3) modbus_set_byte_timeout(3) AUTHORS The libmodbus documentation was written by Stphane Raimbault <stephane.raimbault@gmail.com> libmodbus v3.1.7 04/12/2025 MODBUS_SET_RESPONSE_(3)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLE | SEE ALSO | AUTHORS
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