Status command introduction

82 Chapter 5: Programming commands

Status

The A776 has three methods of providing status to the application. These methods are through batch status commands, real time status commands and unsolicited status mode. An application may use one or more of these methods to understand the current status of the printer. A brief description of each of these methods follows.

Batch status commands – These commands are sent to the printer and stored in the printer’s buffer. Once the printer has processed all the previous commands these commands are processed and the proper status is returned to the application. In the event a condition causes the printer to go BUSY, it stops processing commands from the printer buffer. If a batch status command remained in the buffer during this busy condition, it would not be processed. In fact, no batch commands are processed while the printer is in this state.

Real-time commands – These commands are sent to the printer and stored in the printer buffer. Periodically, when the printer has time, it scans the input buffer looking for these commands. When found by the printer, these commands are processed immediately. This gives the application the ability to query the printer when it is in a busy state in order to correct whatever fault has occurred.

Unsolicited status mode – This mechanism allows the application developer to program the printer to automatically respond with a four byte status when certain conditions in the printer change.

Please see the subsequent sections for a more detailed description of these status commands. At the end of this status commands section is a page entitled “Recognizing data from the printer”. This describes how to interpret what command or setting (in the case of unsolicited status mode) triggered a response from the printer.

Batch mode

For RS-232C printers, these commands enable the printer to communicate with the host computer following the selected handshaking protocol, either DTR/DSR or XON/XOFF. They are stored in the printer’s data buffer as they are received, and are handled by the firmware in the order in which they are received.

When a fault occurs, the printer will go busy at the RS-232C interface and not respond to any of the batch mode printer status commands. If the fault causing the busy condition can be cleared, such as by loading paper, or letting the thermal printhead cool down, the printer will resume processing the data in its receive buffer.

Transmit peripheral device status

ASCII	ESC u 0
Hexadecimal	1B 75 0
Decimal	27 117 0

Value of returned byte:

Bit 0		Bit 1

1	= Drawer 1 Closed	1	= Drawer 2 Closed
0	= Drawer 1 Open	0	= Drawer 2 Open

Bits 2–7 are not used.

Transmits current status of the cash drawers. One byte is sent to the host computer. In DTR/DSR protocol, the printer waits for DSR = SPACE. If a drawer is not connected, the status will indicate it is closed.

Exceptions

Unlike the A756, that had a dedicated connector and resultant dedicated status reporting for each cash drawer, the A776 has a single connector that shares data reporting from either cash drawer. When either cash drawer is open, an open status for both drawers is reported by the printer.

A776 (B780) Programming Guide

A776-PG00001 C 12/09

B780, A776 specifications

Cognitive Solutions A776 is an advanced technology platform designed to enhance decision-making processes through the application of artificial intelligence and cognitive computing. This state-of-the-art solution seamlessly integrates multiple technologies to optimize business operations and drive innovation across various sectors, including finance, healthcare, and manufacturing.

One of the main features of A776 is its robust data processing capabilities. Leveraging powerful machine learning algorithms, the platform can analyze vast amounts of data in real-time, identifying patterns and insights that would otherwise be overlooked. This enables organizations to make informed decisions based on actionable intelligence, significantly improving efficiency and productivity.

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The A776 is also built on a flexible architecture that supports seamless integration with existing IT ecosystems. This interoperability allows organizations to harness their current data sources while taking advantage of the innovative features offered by A776. The platform’s API support enables smooth connections with third-party tools, enhancing collaboration and expanding its range of applications.

Security is a major focus of the Cognitive Solutions A776. The platform is equipped with advanced encryption protocols and compliance measures to ensure that sensitive data is protected against breaches and unauthorized access. This commitment to security helps businesses maintain customer trust and safeguard their competitive advantage.

Scalability is another defining feature of the A776. As businesses grow and evolve, the platform can be easily adapted to meet changing demands. Whether a small startup or a large enterprise, organizations can scale their cognitive solutions according to their operational needs.

Furthermore, the Cognitive Solutions A776 is designed with user accessibility in mind. The interface features customizable dashboards that provide a clear overview of insights and performance metrics, enabling users at all levels to harness the power of cognitive computing without requiring extensive training or technical expertise.

In conclusion, Cognitive Solutions A776 is a cutting-edge platform that offers a range of features, including advanced data processing, natural language processing, robust security measures, and user-friendly design. Its flexible architecture allows it to integrate seamlessly with existing systems, making it an indispensable tool for organizations looking to leverage artificial intelligence in their decision-making processes.

Cognitive Solutions B780, A776 Status command introduction, Transmit peripheral device status

Models: B780 A776

Status