1.1 Introduction

The introduction of high speed, data compression modems, such as Multi-Tech's MultiModemII TM Series, has shown that many PC serial ports are unable to keep up, essentially becoming a bottleneck for the entire system. The ISI551PC card provides processing power to reliably transmit data up to 115.2K bps. Using an ISI enables your system's processor to perform more efficiently. This is because the ISI handles all of the byte-by-byte interrupts generated by the asynchronous terminals and stores the data in buffers. The ISI then generates one interrupt for an entire block of information and transfers the block to the system's microprocessor.

This manual provides the hardware installation procedures for the ISI551PC card. The ISI551PC card is used with Multi-Tech's high speed modems; and is a high speed, buffered, single-port serial card, with its own on board processor. The operation of the card provides the basis for its name ISI (Intelligent Serial Interface), 551 indicating the processing power of a 16550A UART and one port support, and PC indicating that it is an ISA bus card (8 bit), which is able to operate in any 286, 386, 486 or Pentium ISA or EISA compatible bus personal computer. The ISI551PC card can be accessed by any software written to the 16550A specification.

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Multi-Tech Systems ISI551PC owner manual Introduction
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ISI551PC specifications

The Multi-Tech Systems ISI551PC is a versatile and powerful industrial device designed for seamless integration into various communication and automation applications. This device exemplifies reliability and efficiency, suitable for a range of industries such as manufacturing, transportation, and utilities.

One of the most notable features of the ISI551PC is its robust performance in demanding environments. Designed to withstand extreme temperatures, vibrations, and dust, the ISI551PC can operate effectively in tough industrial conditions. This durability ensures that the device remains functional and accurate, minimizing downtime and maintenance costs.

The ISI551PC is equipped with dual SIM support, enhancing its reliability by providing a seamless failover mechanism. In scenarios where network connectivity is critical, the dual SIM capability allows the device to switch between networks without interruption, ensuring constant communication. This feature is particularly beneficial in remote or outdoor applications where connection stability is essential.

Another key technology integrated into the ISI551PC is its advanced data transmission capabilities. Supporting multiple protocols such as TCP/IP, UDP, and MQTT, the device facilitates smooth data handling and connectivity across various interfaces. This flexibility makes it an excellent choice for IoT applications, enabling real-time data collection and transmission from connected devices.

The ISI551PC also boasts a user-friendly interface and intuitive configuration options. Featuring both web-based and serial interfaces, users can easily set up and manage the device remotely, streamlining deployment and monitoring processes. This adaptability to different operational environments makes it a preferred choice for many system integrators.

Additionally, security is a paramount focus for the ISI551PC. With built-in features such as VPN support and secure socket layer (SSL) encryption, the device ensures that sensitive data remains protected from potential threats, thereby enhancing the overall security of communication networks.

In summary, the Multi-Tech Systems ISI551PC stands out in the industrial communication landscape with its robust design, dual SIM capabilities, advanced data transmission options, user-friendly interface, and strong security features. Its versatility and reliability make it an ideal solution for various industrial applications, catering to the growing demands of connectivity and automation in today's fast-paced environment.
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