MODBUS_REPLY(3) 						 Libmodbus Manual						   MODBUS_REPLY(3)

NAME

       modbus_reply - send a reponse to the received request

SYNOPSIS

       *int modbus_reply(modbus_t *ctx, const uint8_t *req, int req_length, modbus_mapping_t *mb_mapping);

DESCRIPTION

       The modbus_reply() function shall send a response to received request. The request req given in argument is analyzed, a response is then
       built and sent by using the information of the modbus context ctx.

       If the request indicates to read or write a value the operation will done in the modbus mapping mb_mapping according to the type of the
       manipulated data.

       If an error occurs, an exception response will be sent.

       This function is designed for Modbus server.

RETURN VALUE

       The modbus_reply() function shall return the length of the response sent if successful. Otherwise it shall return -1 and set errno.

ERRORS

       EMBMDATA
	   Sending has failed

       See also the errors returned by the syscall used to send the response (eg. send or write).

SEE ALSO

       modbus_reply_exception(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(3)