SERIAL

4-5-2. X-ON/X-OFF mode

This mode is accessed when DIP switch 1-6 is set to OFF.

 

X–OFF

X–OFF

X–ON

X–OFF X–OFF X–ON

X–OFF X–OFF X–ON

TXD

RXD

 

Data

 

 

 

Printing

PAPER OUT signal

ON

ON LINE indicator OFF

Power ON

Data

Data

Paper out

Load paper and press

 

the ON LINE switch (Star mode).

Immediately after power on (provided that no error occurs), the printer informs the host that it is ready to receive data by outputting the X-ON signal (control code DC1; value = 11H) over the TXD line. If necessary the printer repeats the signal every three seconds until the host begins sending text data over the RXD line.

When the printer’s remaining buffer space falls to *256 bytes or less, the printer begins to output X-OFF signals (DC3, value = 13H) over the TXD line. The host responds by halting the data transfer. Note that the printer remains capable of receiving data until the buffer becomes full.

Available buffer space increases as the printer prints the buffered data. When the printer has cleared all but the last *256 bytes of data, it again outputs the X-ON signal.

 

Data buffer full Nearly full

Nearly empty

Empty

 

*256 bytes

 

 

*256 bytes

 

 

remaining

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Printer outputs

 

 

 

 

Pinter outputs

X-OFF.

 

 

 

 

 

X-ON.

* 16 bytes when the buffer size is set to 45 bytes

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Image 16
Star Micronics RS232 manual ON/X-OFF mode, This mode is accessed when DIP switch 1-6 is set to OFF

RS232 specifications

Star Micronics RS232 is a versatile and widely used connectivity standard that enables seamless communication between peripheral devices and computers, particularly in point-of-sale (POS) environments. This technology is renowned for its robustness and reliability, making it a preferred choice for businesses in various sectors, including retail, hospitality, and healthcare.

One of the main features of Star Micronics RS232 is its ability to facilitate serial communication, allowing devices to exchange data one bit at a time over a single communication line. This enables simple and effective connections between devices like printers, cash registers, and barcode scanners. The standard typically operates at data rates ranging from 300 to 115200 bits per second, accommodating various application needs.

The RS232 interface is characterized by its 9-pin (DB9) or 25-pin (DB25) connectors, with the DB9 being the more commonly used in modern applications. It provides a straightforward plug-and-play experience, allowing devices to be easily connected and configured without extensive technical knowledge. This simplicity is particularly beneficial for retail staff who may not possess in-depth IT expertise.

Another significant aspect of RS232 technology is its point-to-point architecture. This means each connected device operates independently, enhancing overall system performance. Moreover, RS232 supports long-distance communication, with the ability to transmit data over cable lengths of up to 50 feet (15 meters), which is advantageous in larger retail settings.

In terms of compatibility, Star Micronics RS232 devices are designed to work seamlessly with various operating systems, including Windows, macOS, and Linux. This widespread compatibility ensures that businesses can continue to leverage their existing infrastructure without the need for costly upgrades.

Additionally, Star Micronics has incorporated advanced technologies into their RS232 products, such as built-in error checking and data control features. These enhancements help minimize data transmission errors and ensure that the information exchanged between devices remains accurate and reliable.

In summary, Star Micronics RS232 offers a robust set of features, including simple connectivity, point-to-point architecture, and compatibility with various systems. Its proven performance and reliability make it a trusted choice for businesses looking to enhance their operational efficiency and streamline their processes. As POS technology continues to evolve, the Star Micronics RS232 standard remains a foundational component for effective device communication.