3270s The following examples are RDEVICE macros describing a nonswitched
point-to-point communication line connected to a 2701, 2703, and 3705. RDEVICE ADDRESS=078,DEVTYPE=2701,ADAPTER=BSCA,CLUSTER=CLUST001 The cluster station that is connected to this line is defined by the CLUSTER macro labeled CLUST001. The line at address 078 is controlled
by a 2701 transmission control unit. RDEVICE ADDRESS=080,DEVTYPE=2703,ADAPTER=BSCA,CLUSTER=CLUST020 The line at address 080 is controlled by a 2703 transmission control ana corresponding CLuSTER maCLO ib C1USTG20. RDEVICE ADDRESS=OB8,DEVTYPE=3705,ADAPTER=BSCA, BASEADD=OBO,CLUSTER=CLUST030 RDEVICE ADDRESS=OBO,DEVTIPE=3705,ADAPTER=TYPE1,MODEL=B4 CPTYPE=EP,CPNA"E=CEPOBO x
x
The line at address OB8 is controlled by a 3705 Communications
Controller and the corresponding CLUSTER macro is labeled CLUST030. Failure to code the CPNAME operand on the RDEVICE macro
instruction for the 3704/3705 base address causes V"/370 to mark the
device "not operational" at IPL time. The cluster on that 3704/3705 is
therefore unusable.
THE RESOURCE IDENTIFICATION CODES After the real 1/0 configuration file (DMKRIO) assembles successfully,
generate a list of the resource identification codes that correspond to
each line address. Give the list to the operations group at your
installation. The operator needs to know the resource identification
code when he issues the commands to control the operation of the remote 3270 lines and terminals.
The resource identification code is a four-digit hexadecimal code.
The low-order three digits of the resource identification code are the
resource address. The high-order digit is the line code.
The resource address is generated by V"/370; the order in which the TERMINAL macros appear in the real I/O configuration file (DMKRIO) determines the resource addresses of the terminals defined. Each CLUSTER macro defines a 3270 control unit; each 3270 control unit has a
resource address of X'OO'. The device defined by the first TERMINAL
macro after the CLUSTER macro (in the DMKRIO file) has a resource
address of X'Ol', the second has a resource address of X'02', up to the
maximum of X'20'. This resource address makes up the low-order three
digits of the resource identification code.
The line code is also generated by V"/370. Refer to the assembly
listing for D"KRIO to determine the line code (the high-order digit of
the resource identification code). Locate the label DMKRIORN near the
56 IBM V"/370 Planning and System Generation Guide
3270s end of the DMKRIO assembly listing. This label identifies a list of all
theĀ· lines used by remote 3270s and by 3704/3705 Communications
Controllers in NCP mode. The high-order digit is the line code and is according to the order in which the line addresses appear in
the list. The first line address is assigned a line code 0 to complete
its resource identification code, the second is assigned 1, and so on up
to the last line. VM/370 supports a maximum of 16 binary synchronous
lines for use by remote 3270s; thus, the maximum value of the high-order
digit is F. Figure 9 shows you a sample DMKRIO assembly listing and the
corresponding line codes.
r------------------------------------------------------------------------------------
Sample of DMKRIO Assembly Listing Line
Code (in
hexadecimal)
L DMKRIORN DC P'4' DC AL2Ā«RDV07S-DMKRIODV)/S) DC XL2'07S' DC AL2Ā«RDV07A-DMKRIODV)/8) DC XL2'07A' DC AL2Ā«RDV079-DMKRIODV)/8) DC XL2'079' DC AL2((RDV07B-DMKRIODV)/8) DC XL2'07B' o
2
3
Figure 9. Example of Determining Line Code for Remote 3270 Resource
Identification Codes
Once you determine the resource identification codes for the devices
in your remote 3270 configuration, generate a list for operations. The
list should include the following information: ā€¢ Line address ā€¢ Line code ā€¢ Resource address ā€¢ Label of plug on control unit panel ā€¢ Resource Identification code ā€¢ Device type The plug panel of the 3271 control unit and 3274 control unit Model 1C have up to 32 ports where terminals and printers can be
attached. The 3276 has up to S ports where the 3276 integrated display
is attached and where up to 7 additional terminals or printers can be
attached.
AN EXAMPLE OF A REMOTE 3270 CONFIGURATION This example shows you the contents of the real 1/0 configuration file
to define the following remote 3270 configuration: ā€¢ A clustered 3271 control unit with eight ports ā€¢ A standalone 3275 display station
The macros are coded so that the 3271 clustered control
support eight display devices, or six display devices and two
To define such a configuration, you must code 2 CLUSTER, 16
and 2 RDEVICE macros defining the 2 separate clusters.
standalone control unit, with one display and one printer,
supported by the following macros. To define it, you must CLUSTER, one TERMINAL, and one RDEVICE macro.
unit can
printers. TERMINAL, A 3275
is also
code one Part 1. Planning for System Generation 57
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