** FOR IMMEDIATE RELEASE **
Wireless NEMA 16-Channel Optically Isolated Input / Relay Output Module
And Wireless Serial Modem
SAN DIEGO, CA—February 17, 2006—ACCES I/O Products, Inc. is excited to announce a new addition to its
line of wireless data acquisition products—the Model WM-IIRO-8. The unit features 8 Form C (SPDT)
electromechanical relays and 8 optically isolated digital inputs with change-of-state interrupt generation. The
WM-IIRO-8 is an intelligent 8-bit parallel digital I/O unit that communicates with an ACCES Wireless Serial
Modem (sold separately) via a 900MHz wireless connection. Up to 255 devices can easily be used with one
Wireless Serial Modem which connects to a host computer’s standard COM port using RS-232 (or RS-485) serial
communications. Both the WM-IIRO-8 and Wireless Serial Modem are packaged in small, rugged, NEMA4
enclosures; perfect for remote installations in harsh atmospheric, industrial, or marine applications. The unit offers
a low-cost alternative to costly signal wire installations in applications such as agricultural and irrigation systems,
building management and control, security, and factory automation.
A text-based command/response protocol permits communication with most computer systems. The unit can
operate at distances up to 7 miles line-of-sight (up to 20 with optional antenna). The 8 isolated inputs can be
driven by either DC sources of 3-28V (or higher by special order) or AC sources at frequencies of 40Hz to 10kHz
and are not polarity sensitive. Input signals are rectified by photocoupler diodes. External resistors connected in
series with the photocouplers may be used to extend the input voltage range. Each input circuit contains a low-
pass switchable filter to accommodate AC inputs. The electromechanical relay outputs may be programmed
individually or as an 8-bit byte. These outputs may be latched or pulsed for a prescribed period of time. The relays
are de-energized at power-on.
A microcontroller gives the WM-IIRO-8 the capability and versatility expected from a modern, stand-alone,
distributed control system. A built-in watchdog timer resets the pod if the microcontroller hangs up. Data
collected by the unit can be stored in local RAM and accessed later through the computer’s serial port.
Key features of the WM-IIRO-8 include:
• 8 Optically-Isolated, Non-Polarized Digital Inputs with Change-of-State Detection
• 8 Form C SPDT Electromechanical Relays Can Switch Up to 1 Amp Each
• Relays Can be Configured for Level or Pulse Modes
• Microcontroller with RAM and EEPROM
• Built-in Watchdog Timer
• NEMA4 Enclosure for Harsh Atmospheric, Industrial, or Marine Environments
• Ability to Program with Custom Firmware over Wireless Connection
• 900MHz Wireless Connection
• RS-232 (or RS-485) Serial Interface to Host Computer
• OEM Version without NEMA4 Enclosure
• Optional Input Only and Relay Only Versions
The WM-IIRO-8 is supported for use with virtually any computer and includes a text-based Windows
software package. Text programming permits you to write applications in any high-level language that
supports ASCII string functions. This package contains a graphical setup program along with sample
programs and source code in Visual Basic, Delphi, C++ Builder, and Visual C++. A Windows-based
application is included that allows for establishing communication, quick setup and testing of I/O. The
program displays all inputs and outputs simultaneously, and allows for one-click operation. Full source
code is provided, as well as a number of other samples in a variety of languages to demonstrate
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