modbus_set_response_timeout(3) [debian man page]
MODBUS_SET_RESPONSE_(3) Libmodbus Manual MODBUS_SET_RESPONSE_(3) NAME
modbus_set_response_timeout - set timeout for response SYNOPSIS
void modbus_set_response_timeout(modbus_t *ctx, struct timeval *timeout); DESCRIPTION
The modbus_set_response_timeout() function shall set the timeout interval used to wait for a response. If the waiting before receiving the response is longer than the given timeout, an error will be raised. RETURN VALUE
There is no return values. EXAMPLE
struct timeval old_response_timeout; struct timeval response_timeout; /* Save original timeout */ modbus_get_response_timeout(ctx, &old_response_timeout); /* Define a new and too short timeout! */ response_timeout.tv_sec = 0; response_timeout.tv_usec = 0; modbus_set_response_timeout(ctx, &response_timeout); SEE ALSO
modbus_get_response_timeout(3) modbus_get_byte_timeout(3) modbus_set_byte_timeout(3) AUTHORS
The libmodbus documentation was written by Stephane Raimbault <stephane.raimbault@gmail.com[1]> NOTES
1. stephane.raimbault@gmail.com mailto:stephane.raimbault@gmail.com libmodbus 3.0.3 05/26/2012 MODBUS_SET_RESPONSE_(3)
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MODBUS_REPLY_EXCEPTI(3) Libmodbus Manual MODBUS_REPLY_EXCEPTI(3) NAME
modbus_reply_exception - send an exception reponse SYNOPSIS
*int modbus_reply_exception(modbus_t *ctx, const uint8_t *req, unsigned int exception_code); DESCRIPTION
The modbus_reply_exception() function shall send an exception response based on the exception_code in argument. The libmodbus provides the following exception codes: o MODBUS_EXCEPTION_ILLEGAL_FUNCTION (1) o MODBUS_EXCEPTION_ILLEGAL_DATA_ADDRESS (2) o MODBUS_EXCEPTION_ILLEGAL_DATA_VALUE (3) o MODBUS_EXCEPTION_SLAVE_OR_SERVER_FAILURE (4) o MODBUS_EXCEPTION_ACKNOWLEDGE (5) o MODBUS_EXCEPTION_SLAVE_OR_SERVER_BUSY (6) o MODBUS_EXCEPTION_NEGATIVE_ACKNOWLEDGE (7) o MODBUS_EXCEPTION_MEMORY_PARITY (8) o MODBUS_EXCEPTION_NOT_DEFINED (9) o MODBUS_EXCEPTION_GATEWAY_PATH (10) o MODBUS_EXCEPTION_GATEWAY_TARGET (11) The initial request req is required to build a valid response. RETURN VALUE
The modbus_reply_exception() function shall return the length of the response sent if successful. Otherwise it shall return -1 and set errno. ERRORS
EINVAL The exception code is invalid SEE ALSO
modbus_reply(3) libmodbus(7) AUTHORS
The libmodbus documentation was written by Stephane Raimbault <stephane.raimbault@gmail.com[1]> NOTES
1. stephane.raimbault@gmail.com mailto:stephane.raimbault@gmail.com libmodbus 3.0.3 05/26/2012 MODBUS_REPLY_EXCEPTI(3)