3270s The number of binary synchronous lines supported by VM/370 for 3270 use is 16 minus the number of 3704/3705 Communications Controllers in NCP mode minus one (if there are any 3704/3705 Communication
Controllers in EP mode). The CP DIAL command is not supported. 3270 Support on Binary Synchronous Lines
The supported display devices on binary synchronous lines have the same
flexibility and usefulness as locally attached 3270 devices, except for
the following limitations: lnguiry Retrieval Speeg -- Because the 3270 remote stations are subject to (1) relatively slow teleprocessing
transmission speeds and (2) the mechanics of polling screen display and data entry are not as rapid for remote 3270 devices as they are for locally attached 3270s. CP DIAL -- The CP DIAL and ATTACH commands are
not supported for remote 3270 stations. Hard £2£I of 1270 -- Just as users of locally attached 32 7 0 display devices can spool their virtual console input and output
to the system printer, so can the users of remote 3270 display
devices. However, for remote 3270 users, and those local 3270 users
whose terminals may be physically distant from the system printer, provides a limited hard-copy facility at the local and remote
locations. IES! and IEST Eeys -- These keys on the 3270 terminal
are not supported for remote 3270s. The Test Request function on
locally-attached 3277s is supported by the TEST REQUEST key; it is
supported on locally-attached 3278s by the SYSTEM TEST key.
Remote Hardware Configurations Supported VM/370'S support of remote 3270s requires: a binary synchronous line a transmission control unit terminal devices (display stations and/or printers)
and associated control units
The binary synchronous line must be in 2701/2703 mode. The
transmission control units supporting remote 3270s on binary synchronous
lines are: Integrated Communications Adapter (ICA). IBM 2701 Data Adapter Unit with Synchronous Data Adapter Type II. 2703 Transmission Control with Synchronous Data Adapter Type II. IBM 3704 and 3105 Communications Controllers in emulation mode. A 3704/3705 line is in emulation mode when it is controlled by the
Emulation Program (EP). 52 IBM VM/370 Planning and System Generation Guide
Page of GC20-1801-10 As Updated April 1, 1981 by TNL GN25-0837 3270s Cluster and standalone control units are supported for remote 3270s. The IBM 3271 Control unit Model 2, and IBK 3274 Control Unit Kodels 1B
and 1C support clusters of up to 32 display stations and/or printers.
The IBM 3276 Control unit Display Station Models 2, 3, and 4 support
clusters of up to 8 display stations and/or printers. The IBK 3275
Display station, Model 2, is the standalone 3270 device that can be
remotely attached.
Note: The 3276, with a minimum configuration can also be considered a standalone 3270 device.
The following devices are supported when attached to the 3271 control
unit: IBM 3277 Display Station, Model 2 IBM 3284 printer, Model 2 IBM 3286 Printer, Model 2 IBM 3287 printer, 1 and '\ L IBM 3288 Line Printer, Model 2
Note: The 3271/3272 Attachment Feature #8330 is a prerequisite when the rBM 3287 printer is attached to the 3271 control unit.
The following devices are supported when attached to the 3274 Control Unit Model 1C: IBM 3277 Display station Model 2 IBM 3278 Display Station Model 2, 3 and 41 IBM 3284 Printer Model 2 IBM 3286 Printer Model 2 IBM 3287 Printer Models 1 and 2 IBM 3289 printer Models 1 and 2
The following devices can be attached to the 3276 Control Unit Display station Models 2, 3, and 4: IBM 3278 Display Station, Models 2, 3, and 41 IBM 3287 printer, Models 1 and 2 IBM 3289 printer, Models 1 and 2
The IBM 3275 Display Station, Model 2, is a standalone control unit
and display station. IOU can attach the IBM 3284 Printer, Kodel 3, to
the 3275. In addition, you can attach the IBM 3286 Printer, Model 3, to
the 3275 if RPQ MB4317 is installed. With the 3275 Dial Feature you can connect the 3275 to a computer over switched lines by using a
western Electric2 or equivalent data set. The 3275 Dial Feature does
not support full screen read/wr it e.
System Generation Requirements for Remotely Attached Display Systems When you generate VM/370 you must code the appropriate CLUSTER, TERMINAL, and RDEVICE macros and assemble them as part of the DHKRIO (real I/O configuration) file. Then, after the DMKRIO file assembles
successfully, you must make a list of the resource identification codes
of all the remote 3270 lines and terminals. Give the list to the
operations group at your installation; the members of that group need
this information when they issue the CP commands that control the
operation of remote 3270 lines and devices. IModels 3 and 4 default to the 1920 character screen size and are
functionally equivalent to the Model 2.
2Trademark of Western Electric Co.
Part 1. Planning for System Generation 53
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