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Man Pages


Manual Reference Pages  -  MODBUS_REPLY (3)

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NAME

modbus_reply - send a reponse to the received request

CONTENTS

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 St\(&#146;ephane Raimbault <\m[blue]stephane.raimbault@gmail.com\m[][1]>

NOTES

1. stephane.raimbault@gmail.com  mailto:stephane.raimbault@gmail.com
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libmodbus 3&.1&.0 MODBUS_REPLY (3) 10/06/2013

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