Paqe of GC20-1806-9 As Updated April 1, 1981 by TNL GN25-0834 NETWORK The CP NETWORK command loads, du.ps, and controls the operation of a 370x control program in the VM/370 environment. NETWORK is also used to
control remote 3270 devices attached to VM/370 via binary synchronous
lines and 270x or 370x (operating in 270X emulation mode (EP» control
units. NETWORK COMMAND USAGE FOR 370X FUNCTIONS The NETWORK command: • Causes 370x dump operations • Initiates 370x load operations • Enables or disables terminal resources • varies resources online or offline I • Halts a particular resource • Ceases all 370x operations • Queries and displays 370x resource status and storage • Traces line activity to and from a 370x resource NETWORK COKMlND USAGE FOR REMOTE 3270 Use the NETWORK command to control remote 3270 resources and to vary the
polling delay on the binary synchronous lines that are connected to these resources. The NETWORK command.ay be used whether the remote 3270 resources are connected to a 2701, 2703, or to a 370x in Emulation Program (EP) mode with lines in EP mode.
The operands that specifically affect remote 3270s are: • SHUTDOWN (Class A) • VARY (Class A, B) • POLLDLAY (Class A,B) • DISABLE (Class A,B; • ENABLE (Class A,B) • QUERY (Class A,m RESOURCE IDENTIFICATION FOR REMOTE 3270'5 DEVICE AND CONTROL PNITS Resources are defined as display and control units
in the 3270 remote system. Whenever a £emote 3270 resource is referred
to in the NETWORK command, and is identified in a VM/370 system message,
the format is a four-character hexadecimal number, where the three
low-order characters are the actual station resource identifier, and the
high-order hexadecimal character is a relative line code associated with
a particular physical Binary Synchronous Communication (BSC) line that
remote 3270 terminals use. When the 3270 resource is referred to in the SET Plnn COpy command, the 3-character hexadecimal number is the remote 106 VM/370 Operator's Guide

Page of GC20-1806-9 As Updated April 1, 1981 by TNL GN25-0834 resource IO. The 3270 remote resource ID is a 12-bit binary value that
can have a low value of zero, to a high value determined by the number
of CLUSTER and TERMINAL macro instructions defined for a communication
line (ROEVICE) during system generation. For example, assume that there
are two BSC lines for remote 3270 display systems in a particular
configuration. The first line to appear in the OMKRIO module would be
assigned a code of 0, the second line would have a code of 1. Any other
binary synchronous lines used for other purposes are ignored. Resource IO 12 (decimal) on communication line 1 would be represented as "OOOC"; resource IO 31 on communication line 2 would be represented as '101F', etc. HOW TO USE THE NETWORK COMMAND When using the NETWORK command to control the operation of the 310x Emulation Program or remote 3210s on a 2101, 2103, or 310x in Emulator
Program (EP) mode with lines in EP mode, the operator must be aware of
the different classes of resources that are defined at generation time
for the 370x control program and the 3210 remote support. When operating with a 270x or an Emulation Program, there is only one
address for each logon device, and that is the physical subchannel
address for the telecommunications line. For a simple leased line
configuration, there is one resource ID for each line, and one resource
ID for each terminal (one terminal per line), alternating in numeric
value.
The majority of the NETWORK command operations are performed for
terminal resources. For example, NETWORK ENABLE, DISABLE, QUERY, HALT, VARY ONLINE, and VARY OFFLINE all operate for terminals. The NETWORK QUERY command line can be used to display the status of a line resource,
but only when the "NETWORK QUERY resource" command format is used. The
possible states of a line resource are: • OFFLINE (that is, inactive) • ACTIVE I • EP-MODE While the NETWORK VARY ONLINE and VARY OFFLINE command lines may be used
for a line resource, they are primarily intended for use with terminal
resources, because the state of the line changes automatically if the
terminal is enabled or disabled. Also, NETWORK VARY EP is valid only
for line resources and, in this case, the terminal resources change
state when the line changes state.
The only way to tell which resources are lines and which are
terminals is to examine the output from the first stage of the 310x control program generation. The installation system programmer (or
whoever performs the 310x control program generation), should prepare a
cross-reference list of resource IDs and their characteristics (such as
line or terminal, type of line, location, and so on) for the operations
personnel. Use the following commands:
Section 3. CP Commands 107