After all the CLUSTER-TERMINAL groups
the other real I/O configuration macros.
for each binary synchronous line that
Specify the label of the corresponding
macro (CLUSTER=label). CLUSTER Macro
Real 1/0 Configuration File
of macros have been coded, code You must code an RDEVICE macro
supports remote 3210 stations. CLUSTER macro on the RDEVICE Use the CLUSTER macro to define a control unit associated with a remote 3270. Each CLUSTER macro represents a display control unit (a 3211,
3274 Model lC, or 3216, all specified as a 3211) on a leased BSC line,
or a standalone 3215 on either a switched or leased BSC line. One CLUSTER macro must be specified for each 3271, 3214 Model lC, 3215, and
3276.
Note: Each CLUSTER macro must immediately precede the TERMINAL macros defining the devices attached at each remote 3210 station. The groups
of CLUSTER and TERMINAL macros must precede all other macros in the DMKRIO file.
The format of the CLUSTER macro is:
r IName Operation , Operands
'label' CLUSTER CUTYPE={3 271} I I 3215 , , , GPOLL=cudv , LINE=cuu I , I I , DIAL= , , '--- label
is a name of the CLUSTER macro; it must be specified. The label
may be any valid assembler language symbol. The label establishes
a unique symbolic name for this cluster control unit or standalone
station. CUTYPE={3271} 3215 is the control unit of the station; it is either 3211 or 3215. Code a 3214 or 3276 as a 3271.
GPOLL=cudv
are the general polling characters that represent the general
polling technique to be used for this station. When general
polling is used, the first device that the control unit determines
is ready to send data over the line is allowed to do so. The
characters, cudv, are the Q-digit hexadecimal general polling
characters assigned to the control unit of the station. The
hexadecimal equivalent of the EBCDIC transmission code is in the
form cudv, where:
cu are the polling characters for the control unit
dv are the characters for any available input device Part 2. Defining Your VM/310 System 135
CLUSTER "acro The general polling characters for the remote 3270 device Cdv) are
always X'7F' and the general polling characters for the control
unit are defined when the control unit is physically installed. Use Figure 17 to determine what you should code as the general
polling characters for the control unit. GPOLL is ignored if CUTYPE=3275 and DIAL=YES are specified. The 3274 and 3276 terminals have control unit address
switches which are set by the user to match the polling and
selection address characters shown in Figure 17.
LINE=cuu
is the line interface address. It is the address specified on the RDEVICE macro that is associated with this CLUSTER macro. specifies whether the 3275 has the Dial feature.
specified if CUTYPE=3271. DIAL=NO must be
The following CLUSTER macro describes a 3271, 3274, or 3276 control unit
with a control unit address of 2 and a line address of 078. CLUST001 CLUSTER CUTYPE=3271,GPOLL=C27F,LINE=078,DIAL=NO The following CLUSTER macro describes a 3275 display station (without
the Dial feature) that has a control unit address of 0 and a line
address of 080. CLUST020 CLUSTER CUTYPE=3275,GPOLL=407F,LINE=080,DIAL=NO In the real 1/0 configuration file (DKKRIO), the CLUSTER macro must
immediately precede the TERKINAL macros that define the stations
attached to that cluster or standalone station.
136 IBK VK/370 Planning and System Generation Guide
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