Installation guide
40 Introducing the Modbus Plus Network
890 USE 100 00
The application can then be downloaded using a utility supplied with
the development tools. The download host can be connected to
Modbus Plus by a Modicon SA85 (ISA/AT bus) or SM85 (Microchannel
bus) network adapter.
The download image contains all of the internal operating code to be
used in the BM85. It provides the protocols for the serial devices to
establish communication with other devices: handshaking, protocol
translation, packaging of messages, buffer space, data conversion, and
error handling.
The image can contain all of the serial port parameters (for example,
baud rates and parity) as fixed parameters. The image could also
provide a local protocol (default parameters and a menuing system) for
the user to locally configure the parameters through a terminal at one
of the serial ports.
The BM85 can operate as a fully-programmed Modbus Plus coprocessor
in the user application. It can locally manage processes at its serial
ports, initiating or responding to Modbus Plus nodes as needed for
higher-level status reporting and control. Library functions are
provided for creating multiple tasks within the BM85’s application
program, and for assigning and arbitrating the tasks.
The BM85 application development tools include:
V A Borland C/C++ runtime startup routine
V An object library of BM85 utility routines, including functions for
managing multiple tasks within the BM85 application
V A Modbus Plus data transfer utility routine
V A header file containing function prototypes
V A compiled demonstration program, with source code, showing
examples of the use of functions in a typical application
V Test utilities, including source code, that exercise BM85 hardware
V The download utility for loading the application to the BM85.
The software development tools are supplied on both 3.5-inch and
5.25-inch high-density diskettes.