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Bits 7,8
(Cont'd)
00
Sequence Counter 01
Modification
10
11
Current
Setting
Reset sequence counter to 00
Set sequence counter to 01.
Set sequence counter to 10.
Advance sequence counter.
(see table below}
Setting after
being advanced
Subject to
action con-
trol bits
2,1,0 and
bit 6
LSWF
16,15
16, 15
1
12 , 11,
10, 9
(Coordina-
tion message)
OW-l
00
01
10
11
0000
0001
01
10
11
00
Do not originate a coordination message
(CM) from this op word.
(The 0000 setting
and all bit settings here do not prevent
automatic hardware generation of coordinate
messages, also hardware CM information may
be contained in the Op Word generated CM's.
(See Table 3-7).
The following bit settings (5hose other than
0000) are placed into bits 2
- 2 3 of the
communications reportinq
b~te
(CRB) of a
coordination message (CM) generated when the
conditions of the action control bits (2,1,0)
are satisfied.
(Specifying 0001 causes a good
message
ihd.i~ation
(OOOl)
or a bad message
indication (0010) to occur in th€ CRB (communica-
tions reporting byte - 1st. byte of a eM».
Hard-
ware may also independently generate either
of these two settings in the CRB.
(Good Message - Good Parity)
For systems not
using block parity, the 0001 bit setting must
be used to send a good message CM if desired
when the end of message character (or characters)
is detected.
If a character in the message
had bad parity, it will have been replaced by
6
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