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Valid Sources of Request
and Destination to which
Response is Sent-
Control Request
CPU
Bypass Area Station
C ,T
Restore Area Station
C ,T
Bypass Segment
C ,T
Restore Segment
C ,T
Set Read-Deferred-Data Mode
C * * * *
Stop 2790 Input
C ,T
Restore 2790 Input
C ,T
Set Dual Comm. Switch
Reset Dual Comm. Switch
User Table Load— Start
C
User Table Load— Data
C
User Table Load— End
C
CPU Restart
C
2715 Restart
C
Scan AS/Adapter Error
V
Send Partial Error Log
C
Reinitialize Disk
C
O n-Line Core Dump
Set Day
C
Monitor Day
C
Monitor Time
C
Set Time
T
Reset Read-Deferred-Data Mode
Initialize Error Logout
Sectors (CE Function)
Reset TPS
Purge Core Data
*Response is sent to 2740, if available; otherwise, it is sent to the CPU.
**First two bytes specify deferred-restart-number; second two bytes specify priority-restart-number.
***First byte must be 0 (X'FO'); remaining three bytes specify any EBCDIC numeric character.
****Response is not immediate but dependent on certain conditions.
T
No response is sent.
Q
Segment Address
Segment A
'C1 •
Segment B
'C2'
Segment C
'C3'
Segment D
'C4'
•
Figure 27.
Control Requests
. r j = X'F 1 ' — The 2715 has performed a 2790 ERP
1
(Error Recovery Procedure) automatically. The rest
of the data bytes define the status of the 2790 system
and the actions, if any, taken to correct the problem.
See "2790 ERP Message Format" for the definition
of the data bytes.
Requested from CPU
in Control Message
Transaction
C - CPU
Header
P - 2715 Panel
Control
T - 2740 Terminal
Byte
(Hex)
(Char)
2715
2740
Content
C ,P
C l
A
AS address
AS
C ,P
C2
B
address
Segment
C ,P ,T
C3
C
address
Segment
C ,P ,T
C4
D
address
C5
E
C ,P
C6
F
C ,P ,T
C7
G
P
P
D1
J
D2
K
D3
L
Restart
D4
M
number
Restart
D5
N
numbers**
,
c
p
T*
T*
D6
O
C
D7
P
D8
Q
T
3-digit day
P
E2
S
number***
P
E3
T
P
E4
U
P
E6
W
P
P
P
Format of Request
Requested from 2715 Panel
Transaction
Data Field
Data Bytes:
of Message
Control Byte:
Data/Address
Data/Address
Switches
Switches (Hex)
(Hex)
Length
0-3
4-7
8-15
AS address
1
C
1
AS
1
C
2
address
a
Segment
V
1
C
3
address
.
Segment
^
1
C
4
address
_
6
C
_
_
7
C
C
8
C
9
2
4
D
5
D
6
_
D
7
_
.
.
Any numeric
4
F
characters
_
.
E
3
_
4
E
Any numeric
Any numeric
.
characters
characters
_
.
E
A
_
B
E
_
E
C
2. rj = X'F2' — The 2715 has detected that less than
64 disk sectors remain available for data. The 2715
sends the X'FD' message and automatically causes
a X'C
' ('stop 2790 input') request to be initiated
6
as if it came from the CE/operator panel. The CPU
should (
) send X'C5' ('set read deferred data mode'),
1
Requested from 2740 Keyboard
Positive Response
L/Idpiuycu Ull
Display Registers
Transaction
Data Bytes
Entered from
Control Byte
Keyboard:
Entered from
Keyboard
Content Length
-
-
-
C
C
*
.
.
v
c
*
_
_
_
c
v
.
c
.
_
_
c
< ;
c
D
A S/
O
ADAPT
D
D
Core
address
4
R
_
_
_
E
_
_
0
Any numeric
characters
_
E
.
.
E
_
_
_
E
_
_
_
E
Transmission Control Unit
___ J „ 071 £
1
JLf
(Hex)
1
F
0
2
F
0
3
F
0
4
F
0
6
F
0
7
F
0
8
F
P
9
F
0
5
F
0
6
F
0
7
F
0
2
F
0
Any numeric
characters
5
F
0
A
F
0
B
F
0
C
F
0
45
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