DIGITAL INPUT/OUTPUT CARD

IOD-144

USER MANUAL

The IOD-144 uses six 8255-5 PPIs to provide a total of 144 bits input/output capability. The card is designed to use each of these PPIs in mode 0 wherein:

a.There are two 8-bit ports (A and B) and two 4-bit ports (C Hi and C Lo).

b.Any port can be configured as an input or an output.

c.Outputs are latched.

d.Inputs are not latched.

Each PPI contains a control register. This Write-only, 8-bit register is used to set the mode and direction of the ports. At Power-Up or Reset, all I/O lines are set as inputs. Each PPI should be configured during initialization by writing to the control registers even if the ports are going to be used as inputs. Output buffers are automatically set by hardware logic according to the control register. Control registers are located at base addresses +3, +7, +B, +F, and +17. Bit assignments in each of these control registers are as follows:

Bit

Assignment

Function

D0

Port C Lo (C0-C3)

1

= Input, 0 = Output

D1

Port B

1

= Input, 0 = Output

D2

Mode Selection

1

= Mode 1, 0 = Mode 0

D3

Port C Hi (C4-C7)

1

= Input, 0 = Output

D4

Port A

1

= Input, 0 = Output

D5,D6

Mode Selection

01 = Mode 1, 00 = Mode 0

 

 

 

1X = Mode 2

D7

Mode Set Flag

1

= Active

NOTE:

Contact ACCES for directions if you wish to operate this card in mode 1. This card cannot be operated in mode 2

IOD-144 provides a means to enable/disable the tristate I/O buffers under program control. If the BEN/TST jumper on the card is installed in the BEN position, the I/O buffers are permanently enabled. However, if the jumper is placed in the TST position, enable/disable of the buffers is possible under software control via the Control Register as follows:

a.The card is initialized in the receive mode by the computer Reset command.

b.When bit D7 of the Control Register is set high, the direction of the three ports of the associated PPI chip as well as the mode can be set. For example, a write to Base Address+3 with data bit D7 high programs port direction of Port 1 ports

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Access IOD-144 user manual Digital INPUT/OUTPUT Card

IOD-144 specifications

Access IOD-144 is a cutting-edge device that has garnered significant attention within the field of connectivity solutions. Designed primarily for industrial applications, the IOD-144 is an Internet of Things (IoT) gateway that facilitates seamless communication between devices and applications in a robust and reliable manner. This device is particularly suited for environments that require real-time data processing and monitoring, making it an ideal choice for sectors like manufacturing, transportation, and smart cities.

One of the standout features of the Access IOD-144 is its versatility in supporting multiple connectivity options. It is equipped to handle various protocols, including Ethernet, Wi-Fi, Bluetooth, and cellular networks. This broad support ensures that users can choose the most suitable connectivity method based on their specific requirements and existing infrastructure. The device's ability to adapt to different network environments enhances its utility in diverse operational settings.

In terms of processing power, the IOD-144 prides itself on having a powerful microprocessor, allowing it to perform complex computations and data processing locally. This edge computing capability reduces latency by enabling real-time data analysis and decision-making without the need to constantly communicate with a cloud service. As a result, businesses benefit from faster response times and reduced bandwidth costs.

Moreover, the Access IOD-144 is designed with scalability in mind. It can support an extensive array of sensors and actuators, making it an ideal solution for organizations looking to expand their IoT ecosystems over time. The device can easily integrate with various third-party applications and platforms, ensuring compatibility and allowing for future growth.

Security is another key focus of the IOD-144. With built-in encryption protocols and secure authentication methods, the device helps to safeguard data transmitted across networks. This emphasis on security is crucial, particularly in industrial settings where data breaches can have severe consequences.

Additional features of the Access IOD-144 include user-friendly management software that simplifies deployment, monitoring, and maintenance of connected devices. The device also supports over-the-air firmware updates, ensuring that users can keep their systems up-to-date with the latest features and security enhancements.

In summary, the Access IOD-144 stands out due to its multifaceted connectivity options, powerful processing capabilities, scalability, robust security measures, and user-friendly management tools. These characteristics make it a leading choice for businesses looking to enhance their IoT capabilities while ensuring reliable performance in challenging environments.