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Universal support for five operating systems ◆ C source code provided ◆ Demo program included
ESW-MBLIB Ethernet Modbus C Library Software
Description
Acromag’s Modbus C Library software
greatly simplifies development of programs
to interface with Acromag’s BusWorks
®
and EtherStax
®
Ethernet I/O products. The
library also supports any standard Ethernet
Modbus slave device that communicates
via Modbus TCP/IP or UDP/IP protocol.
This utility is ideal for developers that are
unfamiliar with Modbus protocol or the
framing of TCP/IP or UDP/IP messages.
The C library makes programming easy and
portable by simply linking user code with
the provided function calls (below). Most
function calls require passing only a few
parameters such as the IP address, Modbus
register address, and register count.
Codes Functions
01 (01H) Read Coil (Output) Status
02 (02H) Read Input Status
03 (03H) Read Holding Registers
04 (04H) Read Input Registers
05 (05H) Force Single Coil (Output)
06 (06H) Preset Single Register
15 (0FH) Force Multiple Coils (Outputs)
16 (10H) Preset Multiple Registers
17 (11H) Report Slave ID
Example Program
The included example program is menu-
driven to help users build Modbus TCP/IP
and UDP/IP commands. Menu selections let
users configure, read, and write Ethernet
I/O slave devices such as Acromag’s
Busworks and EtherStax products.
Users may also leverage this demonstration
application into a tool for configuration
or test by supplying commands and/or
data values in the form of a text file. The
program will execute each command in the
text file as if it had been typed from the
console terminal.
Key Features & Benefits
■ Library of function routines simplify
communication with I/O modules
■ Works with 32 Bit and 64 Bit operating
systems
■ Function calls provided for a variety of
operating systems
■ C source code supplied
■ Demonstration program included
■ Saves development time
■ Ideal for use with Acromag’s BusWorks
and EtherStax I/O modules
■ Compatible with any standard Modbus
TCP/IP or UDP/IP device
Ordering Information
ESW-MBLIB
Ethernet Modbus C Library Software (CD-ROM)
Bulletin #8400-519c
Ethernet I/O: EtherStax
®
Series
All trademarks are the property of their respective owners. Copyright �� Acromag, Inc. 2019. Data subject to change without notice. Printed in USA 10/2019