Comparing data to indications

VTAM® provides intelligence or facts to the application, including data and control signals from the partner and some control signals generated locally by VTAM to report the status of the partner or the status of the connection to the partner. Information includes data transmitted to the application from the conversation partner. Information also includes indications that cause the application's APPCCMD CONTROL=RECEIVE macroinstruction to complete. Indications are initiated by the partner application by way of macroinstructions or they are initiated using the intervening network components.

This section defines the terms used to describe the categories of normal and expedited information that can be sent and received by the application.

The types of normal information differ from the types of expedited information. Normal information includes normal data and normal indications. Expedited information includes expedited data and expedited indications.

Normal information that can be provided by the application by way of an APPCCMD macroinstruction or reported to the application includes the following information:

Normal data:
- Normal transaction data (for example, logical records)
- PS_Header data
- Error data (for example, Log Data)
- Function management data (for example, FMH-5)
Normal indications:
- The SEND indication
- The DEALLOC indication
- The CONFIRM indication
- Error indications (for example, a conversation failure)
- Other normal indications that do not cause a receive macroinstruction to complete:
  - Log data is waiting to be received—indicated by LOGRCV (RPL6RLOG) in the RPL extension.
  - An FMH_5 is waiting to be received—indicated by FMH5RCV (RPL6FMH5) in the RPL extension.

Expedited information that can be sent by the application or reported to the application includes:

Expedited data:
- Expedited transaction data
Expedited indications:
- The request to send received (RTSR) indication—SIGRCV (RPL6RSIG) and SIGDATA (RPL6SGNL).
- Other expedited indications (for example, expedited data is waiting to be received—indicated by EXPDRCV (RPL6EXDR) in the RPL extension). Note that these do not cause a receive macroinstruction to complete.