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Message Header
Byte
1
Message
Length
Byte
1
The second, third, and fourth bytes of the transaction header,
which are in binary form, print out in hexadecimal notation
as six digits, followed by a space. The space is followed by the
time stamp, two spaces, and the text of the message.
•
Figure 25.
Message Format-System/360 to 2740/1053
System/360 output message. Total core-storage requirements
must be figured on a transaction basis, with the message
header not affecting this total.
Transaction
Length (Bytes)
i - 14
15 - 28
29 - 42
43 - 56
57 - 70
71 - 84
85 - 98
99 -
112
113 - 126
AS orDEU to 1053 Printer Message (Message Routing).
Messages routed from a data entry unit to an area station
to a 1053 Printer are formatted as shown in Figure 26. In
addition to being routed to a 1053, the message may be
logged on the 2740 and/or sent to the CPU as deferred or
priority data.
Message routing provides for the handling of implicit
and explicit address and/or text as follows:
*Explicit text is one or more data entries.
2
1053 Data Message = Hex 01
Message
2740 Data Message = Hex 04
Control
2715 Control Message = Hex 02
3
2
Internally
Allocated
Core (Bytes)
14
28
42
56
70
84
98
112
126
Transaction Header
4
5
• Implicit addressing; explicit text* followed by implicit
text.
• Implicit addressing; explicit text.*
• Explicit addressing; explicit text* followed by implicit
text.
• Explicit addressing; explicit text.*
2715 Control Requests
Figure 27 tabulates information about valid sources for
control requests, routing for responses, and data formats for
System/360 and CE panel requests. This table will be re
ferred to extensively in this section.
Request Formats (Standard)
System/360 Originated. The message-header control byte
is set to X'02' indicating a 2715 control message. The trans
action control byte is shown in Figure 27 for the desired
function. The dafa assignment varies per request. In the
following text, data bytes will be referred to as dt , d
Note that not all 2715 control requests are valid from the
System/360 (e.g., 'set time').
6
7
8
Transmission Control Unit
,...,dn ,
2
43
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