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Byte
Transaction
Transaction
Length
List Number
Byte
Figure 26.
Message Format-AS or DEU to 1053
CE Panel Originated. With the exception of 'set time' and
'set work day' requests, all valid CE-panel control requests
are made by:
. Placing the Panel Select rotary switch in the OPR
1
REQUEST position.
2. Entering the desired transaction control byte into the
Data/Address switches 0-7.
3. Entering any other required data (varying with request)
into Data/Address switches 8-15.
4. Pressing the Panel Request pushbutton.
Note that not all control requests are valid from the CE
panel.
Response Formats
In Figure 27, the column covering responses defines where
responses are sent as a function of where the request origi
nated. Note that the 2715 sends a response message to the
System/360 whenever a panel operator request causes the
2790 system to be reconfigured (e.g., 'bypass AS' initiated
by panel request).
44
Incoming Message Header as Assembled in the 2715 TCU
Transaction Header
AS
D evice
Address
Address
Hex (80-E3)
Outgoing Message Header for 1053 Printer
Transaction Header
Position
Standard Responses to Control Requests Sent to Sys
tem/360. The transaction bytes for control-response mes
sages are shown in Figure 24. The first hexadecimal char
acter is X'C' for System/360 initiated requests, or X'D'
for 2715 (CE panel or 2740) initiated requests. The second
hexadecimal digit defines the type response:
Response data bytes will be referred to as r^ ,
Assignments vary per requests. Response messages are
transmitted to System/360 at the same priority level as
priority data.
Unsolicited 2715 Responses Sent to System/360. The
2715 initiates unsolicited-response messages to inform the
System/360 of certain 2715 detected conditions. The trans
action control byte for an unsolicited-response message is
X'FD'. The first data byte (r j) denotes the reason for
the message. The X'FD' messages are:
Tens
Units
of
of
Hours
Hours
0 1 -3 2 = DEU
00-99
From Address in Decimal
X'A' = Positive response
X'B' = Negative response
X'C' = Invalid response
Tens
Units
of
of
Minutes
Minutes
> rn -
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