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Transaction Header (8 Bytes)
Byte
2
3
4
Transaction
Transaction
Area
Device
Length
List Number
Station
Address
*
Address
Binary
*
Upper left-hand rotary switch references a transaction
from the user's transaction table. The transaction list
number from the table is placed in byte 2 of the header.
5
6
7
8
Tens
Units
Tens
Units
of
of
of
of
Hours
Hours
Minutes
Minutes
Time-of-Day (EBCDIC)
Data Entry (18 EBCDIC Digits)
Digit
2
3
4
Upper
Monitor
Key
Right
71
72
(1,2,or3)
Rotary
13
14
Switch
Digit
10
11
12
13
Lower
78
79
80
Left
20
21
22
Rotary
Switch
Figure 7.
2796 Data Entry as Assembled in the 2715 TCU
DATA ENTRY UNIT TRANSACTION SELECTION
The combination of the Area Station's address, the Data
Entry Unit's address, and the setting of the left-hand (upper
left-hand for 2796) rotary switch selects the proper trans-
action list from the user's transaction-list table. The trans-
action list provides the controls to process the data entry.
All DEU's assigned to a given AS must use the same
transaction list for corresponding rotary-switch settings
(transaction code). Therefore, if both 2795's and 2796's
are attached to a given Area Station, the corresponding
transaction number selected on either the 2795 or 2796
references the same transaction list and is subject to the
same control steps and routing.
5
6
7
8
9
~
T
Card or Badge Columns
73
74
75
76
n
15
16
17
18
19
14
15
16
17
18
Lower
Rocker Thumb;heel Switches
Right
Rotary
1
2
3
4
Switch
Transaction Expansion
The DEU transaction selection may be expanded beyond
the nine transaction codes on the left-hand rotary switch by
using "transaction expansion." Transaction expansion allows
the right-hand (upper right-hand for 2796) rotary switch to
supply a second digit to the transaction code, allowing a
maximum selection of 81 different transactions.
DEU transactions selected by transaction expansion
must be single data entry transactions.
Transaction expansion is a prerequisite for message
routing.
Transaction expansion is activated when the programmer
defines the transaction codes in the transaction group
(TGROUP) macro. See !BJ! System/ 360 OS,DOS BT AM
Planning for IBM 2 790 Data Communication System
Support, C30-1004.
Data Entry Units
13
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