Identifying VTAM device types, screen sizes, and models

VTAM® logon CINIT user data provides IMS with information to build session control blocks. This information includes logon descriptors, screen size, model numbers, and RU sizes.

The information must be accurate to ensure that the correct terminal-related control blocks is built from information in the logon descriptors. Carefully define your VTAM PSERVIC parameters to ensure that IMS selects the appropriate logon descriptors and establishes screen sizes using specific terminal characteristics.

The BIND is rejected if the input and output RU sizes in the BIND are incompatible with the IMS RECANY and descriptor OUTBUF sizes.