modbus_receive_from(3) [debian man page]

MODBUS_RECEIVE_FROM(3)						 Libmodbus Manual					    MODBUS_RECEIVE_FROM(3)

NAME

       modbus_receive_from - receive a indication request from a socket

SYNOPSIS

       int modbus_receive_from(modbus_t *ctx, int sockfd, uint8_t *req);

DESCRIPTION

       The modbus_receive_from() function shall receive an indication request from the socket/file descriptor given in argument 'sockfd. This
       function is used by Modbus slave/server to receive and analyze indication request sent by the masters/clients.

RETURN VALUE

       The modbus_receive_from() function shall store the indication request in req and return the request length if sucessful. Otherwise it shall
       return -1 and set errno.

SEE ALSO

       modbus_receive(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_RECEIVE_FROM(3)

MODBUS_SET_SLAVE(3)						 Libmodbus Manual					       MODBUS_SET_SLAVE(3)

NAME

       modbus_set_slave - set slave number in the context

SYNOPSIS

       int modbus_set_slave(modbus_t *ctx, int slave);

DESCRIPTION

       The modbus_set_slave() function shall set the slave number in the libmodbus context.

       The behavior depends of network and the role of the device:

       RTU
	   Define the slave ID of the remote device to talk in master mode or set the internal slave ID in slave mode. According to the protocol,
	   a Modbus device must only accept message holing its slave number or the special broadcast number.

       TCP
	   The slave number is only required in TCP if the message must reach a device on a serial network. The special value MODBUS_TCP_SLAVE
	   (0xFF) can be used in TCP mode to restore the default value.

       The broadcast address is MODBUS_BROADCAST_ADDRESS. This special value must be use when you want all Modbus devices of the network receive
       the request.

RETURN VALUE

       The modbus_set_slave() function shall return 0 if successful. Otherwise it shall return -1 and set errno to one of the values defined
       below.

ERRORS

       EINVAL
	   The slave number is invalid.

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_SLAVE(3)