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HP 27130A
*
Type Ahead Mode
*
Automatic Output Separator(s) Appendage for Transmitted Text
*
In Echoplex, the MUX may be enabled to echo a CR-LF for a Programmable Single Text
Terminator
TRANSACTIONS
Each transfer between the MUX and the host computer is called a "transaction", and occurs over
the I/O channel. Each transaction represents a single read or write (data, status, etc.)
Each read or write is preceded by a Connect Logical Channel (CLC) request block from the host
computer. The CLC request is in response to an SRQ signal, requesting the next order, from the MUX.
CONNECT LOGICAL CHANNEL (CLC) REQUEST FORMAT
The Connect Logical Channel (CLC) request block has the following format:
7
6
5
4
3
2
1
0
byte 0
high byte log channel
10
~
1
low byte log channel
10
· ·
·
•
•
•
2
S
BLK
F
res
request code
~.
.1
..L
· · ·
3
subfunction code
I
I
I
•
I
•
I.
. ·
.
·
·
· ·
4
po rt
10
I
•
I
•
.I
•
..L
.
· . · ·
·
·
5
data 1 e n9 t h high byte
"
6
data le ngt h low byte
where
log channel I D
Assigned by the host for each transaction. The card firmware will keep the ID with each transac-
tion until it is completed.
4-2
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