HP 3000 Manuals HP 3000 Manuals
Product Structure Both IMF/3000 and SNA IMF perform the same basic function: they support interactive communication between an HP 3000 and an IBM host. Both products emulate the operation of a remote cluster controller with attached display stations and printers. However, the two products have different components that allow them to accomplish this common goal. IMF/3000 IMF/3000 supports both Binary Synchronous Communications (BSC)and Synchronous Data Link Control (SDLC)line protocols. The SDLC protocol used by IMF/3000 supports a 3271 Model 11 Communications Controller, which uses a subset of SNA functions in a Node Type 1 environment. IMF/3000 includes functions from the user level all the way down to and including the INP. The major components of IMF/3000are as follows: * Pass Thru * IMF Intrinsics * Pseudo Driver * IMF Monitor * INP Driver Pass Thru is an application program that uses IMF/3000 intrinsics to make HP terminals and printers attached to an HP 3000 appear to the IBM host as IBM 3278 display stations and IBM 3287 printers. IMF/3000 intrinsics allow an application programmer to exchange screens of data with the host using 3270 screen images. Once the intrinsics obtain the necessary information from you, they use the Pseudo Driver to pass the data to the IMF Monitor for processing. The Pseudo Driver allows IMF/3000 intrinsics and the IMF Manager programs, running on many different user stacks, to queue requests to the IMF Monitor for processing. The IMF Monitor processes data that comes from either the Pseudo Driver or the INP Driver. Also, the IMF Monitor translates and formats 3270-type screens. The INP Driver refers to the INP download file and the INP. The INP Driver carries on the actual conversation with the IBM host. The INP takes data from the IMF Monitor through CS (Communication Services) buffers, places the necessary Data Link/Path Control level information into the data, and sends the data to the host. The IMF/3000 components are not discussed in detail in this manual. Refer to the IMF/3000 User/Programmer Reference Manual for more information about IMF/3000. SNA IMF SNA IMF uses HP terminals and printers to emulate IBM 3278 display stations and 3287 printers attached to an IBM remote control unit in an SNA Node Type 2 environment. SNA IMF does not have an INP download, does not use Communication Services (although SNA Link/V does), does not have an IMF Monitor, and does not have a Pseudo Driver. Also, SNA IMF does not have an IMF Manager program because SNA IMF no longer controls the node. The node is managed by the physical unit (PU), which is controlled by the Node Management Services (NMS) software.In contrast, IMF/3000 starts and stops the node and selects the appropriate configuration file.
NOTE SNA IMF software includes the Pass Thru program and the IMF intrinsics. When both IMF/3000 and SNA IMF/Vare running on the same HP 3000, they share the same Pass Thru program file (TTSSON.PUB.SYS) and IMF intrinsic SL segments.