bionic (3) modbus_set_slave.3.gz

Provided by: libmodbus-dev_3.0.6-2+deb9u1build0.18.04.1_amd64 bug

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 Stéphane Raimbault <stephane.raimbault@gmail.com[1]>


NOTES
        1. stephane.raimbault@gmail.com
           mailto:stephane.raimbault@gmail.com