MODBUS Communications Driver
Some MODBUS commands support “broadcast mode.” This mode essentially addresses the specified command to all devices on the network.
To send a command in broadcast mode, specify an Address of zero.
Attempting to use an Address of zero with a command that does not support broadcast mode will cause the Driver to return an error. Consult your MODBUS device’s documentation to see if it supports broadcast mode, and if so, for which commands.
June 6, 1998