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CICS SEND CONTROL - Send Control

CICS SEND CONTROL provides send control management capabilities, enabling send control processing and output processing in CICS environments. It provides efficient send control capabilities for CICS applications.

What is CICS SEND CONTROL?

CICS SEND CONTROL provides send control management capabilities, enabling send control processing and output processing. It provides efficient send control capabilities, allowing applications to manage send control operations.

Command Syntax

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EXEC CICS SEND CONTROL
    [RESP(response-code)]
    [RESP2(response-code-2)]
END-EXEC.

Parameters Explained

RESP Parameters

Response codes returned by the command:

  • RESP: Primary response code - indicates the success or failure of the send control operation
  • RESP2: Secondary response code - provides additional error information when RESP indicates failure
  • Always check these codes for command success before proceeding with data processing
  • Handle command failures appropriately to prevent application errors

Send Control Types

1. Basic Send Controls

  • Basic send controls: Standard send control operations that handle simple sending without special formatting
  • Mapped send controls: Send control operations that use predefined field mappings to structure send control data
  • Unmapped send controls: Raw send control operations that handle unstructured sending without predefined field mappings
  • Custom send controls: Specialized send control operations designed for specific application requirements

2. Advanced Send Controls

  • Advanced send controls: Complex send control operations that handle sophisticated sending processing and validation
  • Secure send controls: Send control operations that include encryption and security features for sensitive sending
  • Encrypted send controls: Send control operations that automatically encrypt send control data
  • Compressed send controls: Send control operations that handle compressed sending streams and automatically compress send control data

3. Specialized Send Controls

  • Specialized send controls: Send control operations tailored for specific protocols or communication methods
  • High-performance send controls: Optimized send control operations designed for maximum throughput and efficiency
  • Low-latency send controls: Send control operations optimized for minimal delay and real-time processing requirements
  • High-throughput send controls: Send control operations designed to handle large volumes of sending efficiently

Implementation Example

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WORKING-STORAGE SECTION.
01 WS-RESPONSE            PIC S9(8) COMP.
01 WS-RESPONSE2           PIC S9(8) COMP.
 
PROCEDURE DIVISION.
    * Send control operation
    EXEC CICS SEND CONTROL
        RESP(WS-RESPONSE)
        RESP2(WS-RESPONSE2)
    END-EXEC.
    
    IF WS-RESPONSE NOT EQUAL DFHRESP(NORMAL)
        EXEC CICS WRITE OPERATOR
            TEXT('SEND CONTROL command failed')
        END-EXEC
        EXEC CICS RETURN END-EXEC
    END-IF.
    
    * Send control operation completed successfully
    * Continue processing

Send Control Processing

1. Send Control Preparation

Send control preparation includes:

  • Send control validation - ensuring the send control operation is properly configured and authorized
  • Send control formatting - preparing data structures and buffers for send control data
  • Send control encoding - setting up proper character encoding and data transformation
  • Send control processing - initializing the send control operation and preparing for sending

2. Send Control Transmission

Send control transmission includes:

  • Send control routing - directing send control data to the appropriate processing location
  • Send control delivery - ensuring send control data reaches the correct destination within the application
  • Transmission confirmation - verifying that send control was completed successfully
  • Error handling - managing transmission failures and implementing retry mechanisms

3. Output Management

Output management includes:

  • User management - handling user sessions and maintaining connection state
  • Output formatting - structuring send control data for presentation or further processing
  • User experience - ensuring smooth data flow and responsive application behavior
  • Performance optimization - maximizing send control efficiency and minimizing resource usage

Common Response Codes

Success Response Codes

  • NORMAL (0): Send control operation completed successfully - sending was completed without errors
  • SEND (4): Send control operation completed - operation completed with send control-specific status

Error Response Codes

  • INVREQ (16): Invalid request - the send control operation parameters are incorrect or unauthorized
  • NOTFND (20): Resource not found - the specified send control resource does not exist
  • LENGERR (22): Length error - the send control data length exceeds expected limits
  • SEND (24): Send control error - a send control-specific error occurred during the operation

Best Practices

1. Send Control Preparation

  • Prepare send control appropriately - ensure all necessary resources and configurations are in place
  • Validate send control content - verify that send control data meets expected format and quality standards
  • Handle different send control types - implement flexible processing to accommodate various sending formats
  • Ensure send control integrity - maintain data consistency and prevent corruption during sending

2. Error Handling

  • Check all response codes - always examine both RESP and RESP2 for complete error information
  • Handle send control failures - implement appropriate recovery mechanisms for failed send control operations
  • Implement retry logic - provide automatic retry capabilities for transient failures
  • Log error conditions - maintain detailed logs for troubleshooting and monitoring purposes

3. Performance Optimization

  • Minimize send control operations - reduce unnecessary send control calls to improve overall performance
  • Use efficient send control formats - choose appropriate data formats to minimize processing overhead
  • Optimize user updates - streamline user interface updates to reduce response time
  • Manage user resources - efficiently allocate and manage system resources for send control operations

Explain It Like I'm 5 Years Old

Imagine you're sending a control message:

When you want to send a control message, you write it down and send it. If you send it, it goes to the person. If you don't send it, it stays with you.

CICS SEND CONTROL is like sending a control message. The computer program writes data and sends it. If it sends it, it goes to the right place. If it doesn't send it, it stays with the program.

Just like you send control messages, the computer program sends control data!

Exercises

Exercise 1: Send Control Operation

Write a CICS SEND CONTROL command to perform a send control operation.

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EXEC CICS SEND CONTROL
    RESP(WS-RESPONSE)
    RESP2(WS-RESPONSE2)
END-EXEC.

Exercise 2: Send Control Processing

How would you implement comprehensive send control processing that handles different send control types and requirements?

Answer: Identify different send control types and appropriate handling, implement send control validation and encoding, handle different send control types and capabilities, implement proper error handling for send control failures, optimize send control operations for performance, and maintain send control integrity throughout the process.

Quiz

Question 1

What is the primary purpose of CICS SEND CONTROL?

Answer: B) To provide send control management capabilities

Question 2

Which parameter specifies the response code?

Answer: A) RESP

Related Concepts

CICS Send Control Processing

Send control processing and output in CICS

CICS User Management

User management and user interaction in CICS

CICS Output Processing

Output processing and send control display in CICS