Track And Sector Indicators; Status Message Format - IBM 3742 Reference Manual

BSCA Received Data Block (U)
This error results when a remote station sends a data block
and the 3741 is in transmit mode.
Track and Sector Indicators
The track and sector number indicator on the display's
status line has the following meanings:
Modes
T,B,P,D
TT,PT
R,
BT, DT
R, BT, DTwith
remote abort
error condition;
RC,BC,DC
RJ, BJ, OJ with
disk full error
R, BT, DT with
wrong-length
check or TI, RJ,
BI, BJ, PI, 01, OJ
I ndicates Address Position of:
Next record after the last acknow-
ledged record transmitted.
00026 or, if the last data set was
continued, the last record trans-
mitted from disk 1. Always
00026 on disk 2.
Next record after the last acknow-
ledged record received.
Label of the last data set received.
Label of the last data set received
if the remote terminal is a 3741 or
a 3747.
Label of the last data set received
or next valid label if the remote
device is a CPU.
Record in which the error occurred.
Status Message Format
A status message is sent to the remote station after the 3741
has responded negatively to a remote station's line bid
request or after the 3741 has prematurely terminated a
transmission or reception of a message. I n transmit mode
(T, P, B, or 0), this occurs when a transparency check, disk
error, line check, received data block error, disk full error,
or message aborted (after transmitting a block four times)
condition has been encountered. In receive mode (R, BT,
or DT), this occurs when a wrong length check, disk(s) full,
line check, or disk error condition is encountered. Also,
a status message is sent when RESET is used to abort the
transmission or reception of data.
The status message is sent with the following line control
format:
E
3741 N
Q
CPU
A
C 0
K
S
V
0
%
(h
H
e
x)
Displayed Error Indicator
Character
S
~
E
T T
X
X
A
C
K
E
0
T
Communications 61