About the TCP Interface

Note: The source document's section numbering jumps from "四、典型适用场景" directly to "六、常见问题 FAQ" — section 五 is absent in the original. The structure below follows the source as published.

1. What Is the TCP Interface?

Official Definition

The TCP LAN interface is a print-integration solution designed specifically for local network (LAN) environments.

It lets a third party's business system communicate directly, via the internal-network TCP protocol, with the print client software deployed in the same LAN — enabling direct dispatch of print jobs and real-time, automatic callbacks of execution status.

Plain Explanation

In short: the TCP interface = advanced direct-connect printing within the LAN.

Just like within a company's internal network, your computer "talks" directly to the printer via the TCP protocol — not only dispatching print jobs, but also automatically receiving print-status notifications.

Core Characteristics

The TCP LAN interface is a localized task-callback solution, achieving high-speed communication plus real-time status callback within the LAN.

2. Workflow

The TCP interface workflow has 3 steps:

Job Dispatch

The third-party platform calls the local interface to send the print-job command and data directly to the designated printer.

Plain understanding: Your system sends the print job and image data directly to the printer via the TCP protocol.

Real-Time Printing

After receiving the command, the printer immediately starts executing the print job.

Plain understanding: Once the printer receives the job, it starts working right away, with almost no delay.

Status Callback

When the job status changes (e.g. printing started, print completed, print failed), the print client software automatically and in real time pushes status information to the third party's preset Callback URL.

Plain understanding: The printer actively notifies your system of each stage — you don't have to ask.

Callback statuses include:

• Printing started
• Print completed
• Print failed

3. Core Value

Three Core Values

4. Typical Use Cases

Scenarios with Extremely High Data-Security Requirements

Applies to: Scenarios where business data cannot leave the local server room (e.g. government intranets, financial institutions, military/defense units).

Examples:

• Government classified departments where data is strictly forbidden to leave the intranet.
• Financial institutions processing sensitive data locally.
• Military/defense units with extremely high information-security requirements.

Advantage: All data is transmitted within the internal LAN, not via the public network, effectively safeguarding sensitive data.

Scenarios with Strong Real-Time Status-Feedback Needs

Applies to: Automated production lines or business processes.

Examples:

• Factory assembly lines that need real-time print-progress visibility.
• Logistics sorting lines where print status must sync to the main system.
• Automated equipment where print completion triggers the next step.

Advantage: Automatic status callback gives real-time control of job progress, with no active polling.

Localized Deployment Scenarios

Applies to: Network environments isolated from the public internet that still need automated inter-system communication.

Examples:

• Intranet-isolated enterprise environments.
• Closed systems with no public-network connection.
• Local deployments needing automated inter-system communication.

Advantage: Achieves automated communication in an isolated network, balancing security and efficiency.

6. Frequently Asked Questions (FAQ)

Q1: What is the difference between the TCP interface and the Internet interface?

A:

In short: The TCP interface is high-speed direct-connect within the LAN; the Internet interface is remote cloud scheduling.

Q2: Can the TCP interface be called over the public network?

A: No. The TCP interface requires the caller and the printer to be in the same LAN. If remote calling is needed, use the Internet interface.

Q3: How does the status callback work?

A:

1. You provide a Callback URL.
2. When the print-job status changes (started, completed, failed).
3. The print client software automatically pushes status information to your callback address.
4. Your system receives and processes these status notifications.

Q4: How secure is the TCP interface?

A: Security is the highest.

• All communication data is transmitted within the internal LAN.
• It does not pass through the public network, eliminating data-leakage risk.
• Based on the TCP long connection, communication is stable and reliable.
• Suited to scenarios with extremely high security requirements such as government, finance, and military/defense.

Q5: Does the TCP interface require a callback address?

A: Yes. A Callback URL must be preset; the print client software pushes status information to this address.

Q6: What status notifications does the TCP interface support?

A: It supports the following status notifications:

• Printing started
• Print completed
• Print failed

Q7: When should I choose the TCP interface?

A: Choose the TCP interface in the following cases:

• Data cannot leave the intranet (classified units, financial institutions, etc.).
• Real-time status feedback is needed.
• Automated process management is needed.
• The network environment is isolated from the public internet.
• Extremely high real-time performance is required.

Q8: What hardware is required for the TCP interface?

A:

• A Ruifengcai UV printer.
• Print client software.
• The caller and the printer in the same LAN.

Related Documents

The following documents relate to the TCP interface and may need to be consulted together:

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