Page 1
RS-232 to I
User’s Guide
ASCII Interface
2
C Host Adapter
with Circuit Sense
™
www.mcc-us.com
Page 2
Introduction
The MCC iPort/AI 2™ RS-232 to I2C Bus host adapter with Circuit Sense allows
2
any Windows, Linux, or Mac OS X host computer to become an I
2
Slave device, transmitting or receiving I
2
one or more I
C devices across an I2C Bus.
C messages between the host computer and
C Master or
This user’s guide describes the installation and operation of the iPort/AI 2 host
2
adapter, and the RS-232 and I
Utility Pack software for quick I
C Bus interconnects. Also described are the iPort
2
C Bus communication, MS.Net and LabVIEW
libraries for custom software development, and other tools and applications.
A complete set of resources for the iPort/AI 2 is available at:
www.mcc-us.com/iPortAI-2
This product conforms to the I²C Bus specifications defined by NXP/Philips
Semiconductors.
2
To find out more about I
C, we suggest you review our white paper “I2C Bus
Technical Overview” at:
www.mcc-us.com/I2CBusTechnicalOverview.pdf.
I²C is a trademark of NXP (Philips) Corporation. All trademarks acknowledged as
the property of their owners.
01-NOV-2018
Page 3
Copyright© 2018 by Micro Computer Control Corporation. All rights reserved. No
part of this publication may be reproduced by any means without the prior written
permission of Micro Computer Control Corporation, PO Box 275, Hopewell, New
Jersey 08525 USA.
DISCLAIMER: Micro Computer Control Corporation makes no representations or
warranties with respect to the contents hereof and specifically disclaims any implied
warranties of merchantability or fitness for any particular purpose. Further, Micro
Computer Control Corporation reserves the right to revise the product described in
this publication and to make changes from time to time in the content hereof
without the obligation to notify any person of such revisions or changes.
WARNING - Life Support Applications: MCC products are not designed for use
in life support appliances, devices, or systems where the malfunction of the product
can reasonably be expected to result in a personal injury.
WARNING - Radio Frequency Emissions: This equipment can radiate levels of
radio frequency energy that may cause interference to communications equipment.
Operation of this equipment may cause interference with radio, television, or other
communications equipment. The user is responsible for correcting such interference
at the expense of the user.
WARNING - Electrostatic Discharge (ESD) Precautions: Any damage caused by
Electrostatic Discharge (ESD) through inadequate earth grounding is NOT covered
under the warranty of this product. See the “Electrostatic (ESD) Precautions”
section of this guide for more information.
Electronic Waste Notice - This product must NOT be thrown into general waste,
but should be collected separately and properly recycled under local regulations.
Created in the United States of America
Page 4
Table of Contents
1 Overview .......................................................1
iPort/AI 2 Product Features .........................................2
iPort/AI 2 Package Contents ........................................3
System Requirements .............................................4
2 Interconnects ....................................................4
RS-232 Serial Port Connector .......................................4
DB-25 Serial Port Pinout ........................................4
DB-9 Serial Port Pinout .........................................4
iPort Power .....................................................5
Via the power jack .............................................5
2
Via the I
2
C Mini Interface Connector .......................................5
I
C interface connector ....................................5
3 Hardware Configuration ...........................................6
Circuit Sense ....................................................6
Power Source Mode ............................................6
Voltage Sense Mode ............................................6
2
C Bus Pull-up Resistors ..........................................7
I
Connecting to a Low-Voltage Target System ...........................7
Connecting to an SMBus Target System...............................7
4 ESD (Electrostatic Discharge) Precautions .............................8
Host Computer Grounding .........................................8
Case 1 - Desktop and Single-board Computers........................8
Case 2 - Laptop Computers.......................................9
Grounding Solutions ..............................................9
5 Hardware Set-Up.................................................9
Serial Port Connection............................................10
2
C Bus Connection ..............................................10
I
Power Connection ...............................................10
6. Software Support ................................................10
2
C Bus Communication Utilities ...................................10
I
iPort Utility Pack for Windows ...................................10
iPort Message Center ........................................11
iPort Message Manager ......................................11
Page 5
iBurner I2C Bus EEPROM Programmer............................11
2
C Bus Software Development Tools................................11
I
MS.NET Class Library .........................................11
LabVIEW VI Library ..........................................12
ASCII Command Interface ......................................12
iPort/AI 2 Revision Report...........................................13
Additional Information..............................................13
2
Appendix A - I
C Connector Information ...............................14
Declaration of Conformity ...........................................15
FCC Statement..................................................15
CE Declaration of Conformity ......................................15
Page 6
1 Overview
2
The MCC iPort/AI 2 (#MIIC-212), RS-232 to I
C Bus Host Adapter with ASCII
Interface and Circuit Sense, allows any PC, Host Computer, PLC, or Single Board
2
Computer with a legacy or add-on serial port to become an I
2
device, transmitting or receiving I
2
or more I
C devices across an I2C Bus.
C messages between the Host Computer and one
C Master or Slave
Circuit Sense, our I
2
work with the latest I
C Bus voltage sensing technology, allows the iPort/AI 2 to
2
C Bus devices at voltages as low as 0.5 volts.
1
Page 7
iPort/AI 2 Product Features
• OS Support: Windows, Linux, Mac OS X, and many more.
• Host Support: Any Computer with a legacy or add-on RS-232 Serial Port.
• High Performance Processor Increases Throughput (2x to 200x).
2
• External Power Jack or I
C Bus Powered (+5VDC).
• Built-in ESD, Over-voltage, and Reverse-voltage Protection.
• Switch Controlled Properties:
2
C Bus Power Source (5v@100ma).
•I
2
C Bus Voltage Sense (0.5v to 5v, Enable or Disable).
•I
2
C Bus Pull-Ups (1.8K ohm, Enable or Disable).
•I
• Software Controlled Properties:
2
C Bus Master Clock Rates: 100KHz (Fixed)
•I
2
C Bus General Call (Enable or Disable).
•I
2
C Bus Time-Out (1000 milliseconds) (Fixed)
•I
• Host Communication Flow Control (XON/XOFF or RTS/CTS)
• User Interface Echo/Prompt (Enable or Disable).
• User Data Format (HEX or ASCII/HEX)
2
• Supported I
C Bus Activities:
• Master and Slave Functions
• Transmit, Receive, and Tx/Rx Data Functions
• Multi-Master Arbitration Loss Detection
• Clock-stretch Detection
• Bus Time-Out Detection
• 7-bit Slave Address Generation and Detection
• Up to 32K data bytes in a single message
• Software Support:
• Free Application Software (Master, Slave, and EEPROM Programmer).
• Software Development Tools (MS.NET, LabVIEW, and ASCII Commands).
• Compatible with existing iPort/AI applications.
• US-FCC and EUR-CE EMC Compliant.
• RoHS/Lead-Free Compliant.
2
Page 8
iPort/AI 2 Package Contents
The iPort/AI 2 package includes the following items:
2
• iPort/AI 2, RS-232 to I
2
C Bus Mini Clip-lead Cable (4-wire, 1 ft.).
•I
C Bus Host Adapter.
• DB-9F to DB-25M Serial Port Adapter Cable (1 ft.).
• Global 5VDC Power Supply.
• iPort/AI 2 Quick Start Guide.
• iPort/AI 2 Travel Case.
• Online Items*
• iPort/AI 2 Datasheet
• iPort/AI 2 User’s Guide (this document)
• iPort Utility Pack Software
• Application Software.
• Software Development Tools
(* www.mcc-us.com/iPortAI-2
)
3
Page 9
System Requirements
a. A host computer with one free legacy or add-on RS-232 port.
b. Windows XP OS or higher to run iPort Utility Pack applications.
2 Interconnects
The iPort/AI 2 includes three (3) interconnections:
RS-232 Serial Port Connector
RS-232 Serial Port Connector
2
The RS-232 connector provides connection from the I
C adapter to the serial port
on the host computer. For computers with DB-9 connectors, use the DB-9 to DB-25
(#C9F25M1) cable provided with the adapter, or equivalent.
2
The I
C adapter implements the RS-232 interface using the following pins:
DB-25 Serial Port Pinout
DB-25 Pin 2, Transmit Data from the Host Computer to the iPort
DB-25 Pin 3, Receive Data from the iPort to the Host Computer.
DB-25 Pin 4, Request to Send from the Host Computer to iPort.
DB-25 Pin 5, Clear to Send from the iPort to the Host Computer.
DB-25 Pin 7, Ground between Host Computer and iPort
DB-9 Serial Port Pinout
DB-9 Pin 3, Transmit Data from the Host Computer to the iPort
DB-9 Pin 2, Receive Data from the iPort to the Host Computer.
DB-9 Pin 7, Request to Send from the Host Computer to iPort.
DB-9 Pin 8, Clear to Send from the iPort to the Host Computer.
4
Page 10
DB-9 Pin 5, Ground between Host Computer and iPort
iPort Power
2
The I
C adapter requires 50ma of REGULATED +5 volt power. This power can be
supplied in one of two ways:
• Via the power jack.
2
If the I
C adapter is powered via its +5VDC power jack, and the adapter is
operating in power SOURCE mode, excess power is available via the +V wire in
2
the I
• Via the I
C connector to power external devices.
2
C interface connector.
If 50ma of regulated +5V power is available in the target system, and the adapter
2
is operating in power SOURCE mode, the I
2
wire in I
C interface connector.
C adapter can be powered via the +V
2
C Mini Interface Connector
I
2
The iPort/AI 2 I
C Bus host adapter includes a five wire (1x5) 2.54 mm (.100"),
positive locking, shrouded header receptacle connector (see Appendix A) for
2
interfacing to an external I
2
C Clock (SCL)
•I
2
C Data (SDA)
•I
C Bus. Interface lines provided include:
• /INT (Not Used)
• Ground
• +V (optional)
2
Minimum wiring for I
Ground. Use of the +V wire in the I
C Bus communications include I2C Bus Clock, Data, and
2
C Interface connector are user optional.
NOTE: See the Hardware Configuration section below for additional information
2
on configuring the I
C Bus interface.
5
Page 11
I2C Bus Mini Interface Receptacle
2
C Bus Mini-Clip-Lead cables are available to connect the iPort/AI 2 adapter to a
I
Mini Interface Receptacle Pinout
target system. Each clip-lead is identified (White=C=SCL, Red=V=+V,
Green=D=SDA, Black=G=Ground.
2
C Bus Mini-Interface cables with two Mini Interface plugs are also available to
I
2
connect the I
C adapter to an external I2C Bus.
3 Hardware Configuration
Circuit Sense
™
The iPort/AI 2 includes MCC’s Circuit Sense technology. Circuit Sense allows the
2
C interface +V wire can operate in two modes, Power Source Mode and Voltage
I
Sense Mode. Mode selection is controlled by the MODE slide switch on the side of
the unit enclosure.
Power Source Mode - The +V wire can supply power (5v @ 100 mA) Vcc to an
2
external I
and SDA internal pull-ups, if enabled, and Voltage Sense circuit (0.3Vcc Low
0.7Vcc High
C Bus system. In Power Source Mode, the voltage of the iPort/AI 2 SCL,
,
MAX
) is connected to the adapter’s +5v power supply. (Use of the +V
MIN
wire in Power Source Mode is user optional).
Power Source Mode is similar to the standard mode of operation on earlier versions
2
of MCC I
Voltage Sense Mode - The +V wire is connected to the external I
C Bus host adapters.
2
C Bus system
pull-up supply voltage (0.5v to 5v) Vcc, and automatically adjusts iPort/AI 2 SCL,
SDA, and /INT Voltage Sense circuit levels to match (0.3Vcc Low
, 0.7Vcc
MAX
6
Page 12
High
). In Voltage Sense Mode, the voltage of the iPort/AI 2 SCL, SDA, and
MIN
/INT internal pull-ups, if enabled, is equal to the external voltage (Vcc) applied to
the +V wire. (Use of the +V wire in Voltage Sense Mode is required
2
C Bus Pull-up Resistors
I
2
C Bus systems are based on open-collector technology requiring pull-up devices
I
).
on each signal wire (SCL, SDA, /INT). These pull-up devices usually take the form
of pull-up resistors connected to bus power.
2
The I
C adapter includes a PULL-UPS slide switch used to enable or disable
internal 1.8K ohm pull-up resistors attached to the SCL, SDA, and /INT lines.
2
Every I
cases, the pull-ups may be present in the external I
C Bus system must have at least one pull-up on the signal lines. In some
2
C Bus circuit. Use this switch to
configure the pull-up resistors for your system.
Connecting to a Low-Voltage Target System
2
If you are connecting the I
C adapter to a low-voltage (<5v) target system, you
should follow these steps BEFORE applying power:
• Using the adapter MODE slide switch, put the adapter is Sense Mode.
2
• If you target system does NOT supply I
C Bus pull-ups, use the adapter PULL-
UPS slide switch to enable the adapter’s internal 1.8K ohm pull-ups.
2
• Connect the I
C connector +V wire to the target system I2C Bus power. The I2C
adapter will be powered from its own +5V power supply, and adapters pull-ups, if
enabled, and Voltage Sense circuit will be powered by the target system’s lowvoltage power supply.
Connecting to an SMBus Target System
2
If you are connecting the I
C adapter to a SMBus target system, you should follow
these steps BEFORE applying power:
2
• Shut off the I
C adapter’s internal pull-ups (See Pull-up Resistor section).
• Use external SMBus rated (approx. 15k ohm) pull-up resistors. These pull-ups
may already be present in the target system.
7
Page 13
• Visit the I2C .vs. SMBus FAQ page (www.mcc-us.com/I2CSMBusFAQ.htm).
• See the SMBus Specification for additional details.
2
Special Note for SMBus Users: MCC’s I
C adapters are designed to be I2C Bus
compatible, not SMBus compatible. Some features of the SMBus protocol not
supported include time-outs, device reset, and Packet Error Check byte processing.
2
The non-supported SMBus features may, or may not, permit the use of the I
C
adapter in your SMBus application. Consult the MCC FAQ web page and SMBus
Specification for details.
4 ESD (Electrostatic Discharge) Precautions
Electrostatic discharge is defined as the transfer of charge between bodies at
different electrical potentials. Electrostatic discharge can change the electrical
characteristics of a semiconductor device, degrading or destroying it. Electrostatic
discharge also may upset the normal operation of an electronic system, causing
equipment malfunction or failure.
2
When connecting the I
C adapter to a host computer and a target system, extreme
care must be taken to avoid electrostatic discharge. Failure to follow ESD protection
procedures when using the I
adapter, or the target system, and void product warranty coverage.
Host Computer Grounding
Case 1 - Desktop and Single-board Computers. The chassis on a desktop or
single-board host computer must be connected to earth ground to comply with
safety regulations. If the computer chassis is NOT connected to earth ground for
some reason (i.e., use of a two-prong power mains plug), the host computer power
2
C adapter could damage the host computer, I2C
8
Page 14
supply ground will float to some unknown voltage potential.
Case 2 - Laptop Computers. Laptop computers present special ESD problems. Most
laptop computers use an external double-insulated mains power supply which is
NOT connected to the mains earth ground. This means that the laptop chassis is
floating at some unknown voltage potential.
2
In either case, upon connection to the I
computer will discharge energy through its RS-232 port to the I
to the target system. This discharge could damage the host computer, I
C adapter and the target system, the host
2
C adapter, and on
2
C adapter,
and the target system.
Grounding Solutions
2
To avoid damage to the host computer, I
C adapter, or target system, follow these
instructions:
• Wear an earth grounded wrist strap, or discharge any static charge build-up, when
2
handling the I
C adapter or any target system devices.
• Ensure that both the host computer and target system are connected to a common
earth ground point.
• Make sure that all interconnections are made BEFORE applying power to the
2
host computer, I
C adapter, and target system.
• If you are using a laptop computer or host computer that is NOT connected to
mains earth ground, make a hard-wired connection from the host computer (i.e.,
RS-232 port D-connector shell) and the target system ground connector to a
common earth ground point.
• Avoid plugging and unplugging system components while the host computer or
target system is powered.
• Ensure that any devices connected to the target system are properly grounded to
the common earth ground point.
• If unsure how to properly ground system components, seek electrical expert help.
WARNING: Any damage caused by Electrostatic Discharge (ESD) through
inadequate earth grounding is NOT covered under the warranty of this product.
5 Hardware Set-Up
This section provides information on connecting the I
2
computer and I
C Bus target system.
2
C adapter to your host
9
Page 15
Serial Port Connection
2
Attach the I
C adapter to a free legacy or add-on RS-232 port on your host
computer. If your RS-232 port has a DB9 connector, use DB-9F to DB-25M serial
2
port cable included with the I
2
C Bus Connection
I
2
Connect the I
MCC also offers an I
C Bus mini clip-lead cable to the I2C adapter and your I2C device.
2
C mini interface cables that are compatible with our adapters.
C adapter.
You may not need to, or want to, connect the +V wire to your target system. Refer
to the “+5VDC Power Jack” and “Hardware Configuration” sections for details on
pull-up resistors and connecting the optional +V wire.
Power Connection
2
Connect I
C adapter power via the power jack or I2C Bus connector. See “+5VDC
Power Jack” section for details.
2
If you have any questions on I
FAQ Page (http://www.mcc-us.com/faq.htm
C adapter setup and configuration, please visit our
) or contact our technical support team
6. Software Support
2
MCC offers the following categories of I
2
C Bus Communication Utilities
I
C Bus software support:
iPort Utility Pack for Windows
2
The iPort Utility Pack for Windows provides a quick-start to I
C Bus
communications. The Utility Pack includes two Windows-based application that
2
will help you get started sending and receiving I
C Bus messages quickly and
easily.
10
Page 16
iPort Message Center
iPort Message Center is a bus master application with a spreadsheet-like user
2
interface. Each row in the spreadsheet represents a single I
C Bus message. A
message can transmit data to a specified slave device, or read data from a
specified slave device. Received data is automatically displayed in the
spreadsheet.
Message options include repeated-start, and a time delay after each message.
One or more messages in the spreadsheet are transmitted in sequence, and can
auto-repeat at the completion of the last message.
iPort Message Manager
iPort Message Manager is a bus master/slave application that can master
2
transmit, master receive, slave transmit, and slave receive I
C Bus messages.
Message options include master transmit and transmit/receive, and auto-repeat
2
iBurner I
iBurner is our I
C Bus EEPROM Programmer
2
C Bus EEPROM Programmer software package for Windows.
With iBurner, you can quickly and easily blank-check, program, read, and verify
2
a wide variety of I
C Bus EEPROMs. iBurner also supports scripting, allowing
EEPROM programing serialization and automation.
2
C Bus Software Development Tools
I
MCC provides three methods for creating custom application software for ASCII
2
Interface I
C Bus Adapters:
MS.NET Class Library
The MS.NET Class Library provides a comprehensive set of tools for the creation
2
of robust I
C Bus applications. Included are Constructors, Methods, Properties,
Events, Enumerations, and SampleCode for Visual Basic.NET, Visual C#, Visual
C++, Visual J#, and LabVIEW.
11
Page 17
LabVIEW VI Library
The LabVIEW VI Library provides a complete set of low-level, mid-level, and
high-level Virtual Instruments (Vis) for the LabVIEW developer. Included are
2
VIs for establishing a connection to the Adapter, performing I
C Bus Master and
Slave operations, and Sample LabVIEW applications.
ASCII Command Interface
The ASCII Command Interface provides a direct low-level ASCII command
2
application program interface to the I
C Bus Adapter. ASCII commands can be
accessed from a terminal emulation program running on the host computer, or
from an application program using host computer operating system serial port
functions.
iPort/AI 2 software support and more is available at:
www.mcc-us.com/iPortAI-2
12
Page 18
iPort/AI 2 Revision Report
This section defines revisions and changes made to the iPort/AI 2 interface:
Revision: 1.00
7. Initial Release
Additional Information
2
For additional information on the I
2
“What is I
C?”
C Bus, please refer to the following:
www.mcc-us.com/I2CBusTechnicalOverview.pdf
“Frequently Asked Questions (FAQ)”
www.mcc-us.com/faq.htm
2
"The I
C and How to Use It"
www.mcc-us.com/i2chowto.htm
13
Page 19
Appendix A - I2C Connector Information
2
I
C Bus Interface Connector and Plug Information
The iPort/AI 2 uses the following 1x5 2.54 mm (.100") pitch, 0.64 mm (.025")
2
square pin, header and plug assemblies for the I
2
C Header Receptacle
I
C Bus interface.
Molex C-Grid® SL™ 70553 Header
Molex Part # 70553-0004
2
I
C Plug Housing
Molex C-Grid® SL™ 70066 Crimp Housing
Molex C-Grid® SL™ 70058 Crimp Terminal
2
iPort/AI 2 I
C cables and other accessories are available online at:
Molex Part # 50-57-9405
Molex Part # 16-02-0102
www.shop-mcc-us.com
14
Page 20
Declaration of Conformity
FCC Statement
DECLARATION OF CONFORMITY WITH FCC RULES FOR ELECTROMAGNETIC
COMPATIBILITY
We, Micro Computer Control Corporation, of 83 Princeton Avenue #1D / PO Box 275,
Hopewell, New Jersey 08525 USA, declare under our sole responsibility that the product:
iPort/AI 2 (#MIIC-212) and iPort/AFM 2 (#MIIC-213)
to which this declaration relates:
Complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions;
(1) this device may not cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause undesired operation.
Test Laboratory Information:
MET Laboratories, Inc.
Test Report Number: EMC88332-FCC
Test Report Date: January 27, 2016
Technical file held by: Micro Computer Control Corporation, 83 Princeton Avenue #1D / PO
Box 275, Hopewell, New Jersey 08525 USA, or its applicable authorized distributor or
representative.
CE Declaration of Conformity
We, Micro Computer Control Corporation, of 83 Princeton Avenue #1D / PO Box 275,
Hopewell, New Jersey 08525 USA, declare under our sole responsibility that the iPort/AI 2
(#MIIC-212) and iPort/AFM 2 (#MIIC-213), to which this declaration relates, is in
conformity with EMC Emissions Standard for Information Technology Equipment
EN55022:2010, and EMC Immunity Standard for Electrical Equipment for Measurement,
Control and Laboratory Use EN 61326-1: 2013.
Test Laboratory Information:
CLASS Industries, Ltd.
Test Report Number: CI06074
Test Report Date: November 3, 2015
Technical file held by: Micro Computer Control Corporation, 83 Princeton Avenue #1D / PO
Box 275, Hopewell, New Jersey 08525 USA, or its applicable authorized distributor or
representative
15
Page 21
www.mcc-us.com
16
Loading...