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Loop 1
Figure 19.
Line Transfer Switch-Third Unit
For output messages, the area station address, device address,
and time of day from the transaction header are printed
ahead of the text. The time field must contain a valid
EBCDIC numeric character.
For System/360-to-2715/2740 messages, the user can
insert special carriage-control characters (new line, tab,
line feed, and backspace) within the text; however, it is the
user's responsibility to include the appropriate number of
"idle" characters following a tab character. The 2715 will
insert the required number of idle characters following a
new-line character.
The 2715 will automatically insert a new-line character
at the end of text without any user-inserted control char
acter.
2715-to-2740 Control Messages. For control between the
2715 and the 2740, the user may specify 2740 transaction
Loop 2
routing when he assembles the user tables. Control and
error messages are printed automatically. The operator
initiates a control request as follows:
1. Press Line Bid (start of text)
2. Press request (alphabetic character)
3. Enter addressing data
4. Enter byte count (for "On Line Dump" only)
5. Press EOT
Allowable 2740 control requests are:
I
Scan Area Station/Adapter Errors. The request character
is an alphabetic 0 (X'D6'). The address data is the hexa
decimal representation of the area station address.
On Line Dump. The request character is the letter R
(X'D9'). The address data is the hexadecimal representatior
| of the first core position to print out. The byte count is the
IBM 2715 Transmission Control Unit
29
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