What is the purpose of the modified data tag?
The modified data tag (MDT) is the bit in the attribute byte that determines whether a field should be transmitted from a terminal to CICS®. The MDT for a field is normally turned on by the 3270 emulator (the CICS cicslterm and cicsteld processes) when the user enters data into a field.
What is the advantage of modified data tag MDT?
Modified Data Tag MDT is a flag which holds a single bit. It specifies whether the value is to be transferred to the system or not. Its default value is 1, when the field value is changed. If MDT is 0, then data cannot be transferred; and if MDT is 1, then data can be transferred.
What is MDT in mainframe?
MDT refers to the Modified Data Tag which is an attribute character of one-bit that allows on-screen modification of the field. In case if the user modified any field then MDT turns on automatically. The data is sent to the host program by terminal only if the MDT is on.
What is map and Mapset?
When you define a screen using BMS, the screen is called a map. A collection of screens is called a mapset. Both physical (used primarily by CICS) and logical or symbolic maps (used primarily by the application program) must be created.
What is the position of modified data tag in the attribute byte?
Modified Data Tag (MDT) is the last bit in the attribute byte. MDT is a flag which holds a single bit. It specifies whether the value is to be transferred to the system or not. Its default value is 1, when the field value is changed.
What is Dfhmsd in CICS?
Description. A DFHMSD macro contains one or more map definition macros, each of which contains one or more field definition macros. It begins: mapset DFHMSD TYPE=MAP (or TYPE=DSECT) and ends: [mapset] DFHMSD TYPE=FINAL. mapset is the one- through seven-character name of the map set.
What is Mapset in CICS?
A collection of screens is called a mapset. Both physical (used primarily by CICS) and logical or symbolic maps (used primarily by the application program) must be created. To create the original map definition, CICS provides assembler-language macros for use under BMS.