Analyze the 3270 application
You need to analyze the 3270 application programs that form your transaction in order to replace the 3270 input data with messages sent by your client program.
You can use the 3270 Bridge Passthrough SupportPak ( See Using the 3270 Bridge Passthrough SupportPac ) to drive your applications and log 3270 commands.
3270 programs fall mainly into the following types:
- Minimum function BMS
- This includes minimum function, SEND TEXT, and ACCUM. Link3270 supports these applications. Bridge clients can be written relatively easily by a CICS programmer.
- BMS and little 3270 datastream
- A typical example of this type is an application that issues RECEIVE of command line input, and issues a send MAP as output. Link3270 supports these applications. Client applications can be written relatively easily by a CICS programmer.
- Mixed BMS and 3270 datastream
- A typical example of this type is an application that issues RECEIVE and then RECEIVE MAP FROM. Link3270 supports these applications but the client programs are more difficult to write because MAP information has to be supplied in 3270 datastream format.
- Pure 3270 datastream
- Typically user-written 3270 datastream where the user has a well-understood fixed 3270 datastream structure. This is supported but the client program is more difficult to program than with BMS. However this is usually the format understood by the programmer of the target application.
- Alternative map generators
- 3270 datastreams are generated dynamically. Link3270 supports these applications but the client programs are more difficult to write because MAP information has to be supplied in 3270 datastream format.
- Full function BMS
- Including ACCUM, PAGE and PARTITION support. These programs are not supported and will be detected by the load module scanner or the Passthrough tool.