RCA 70/700 Series Reference Manual page 34

OW-l
Explanation
(Cont'd)
Z (ist) - First
Character of start
of Message Sequence
C
(1st) - Second
Character of start
of Message
Sequence
CCM Initialization
12-9 - 001 identical to 2 3 - 2 0 of CRB (vari-
able by program). Generate CM
indicating receipt of V; therefore, V
does not have to be stored in processor
memory.
13-1 - Terminate existing command (Receive)
because V means the connected remote
terminal has nothing to serrl.
14 - 0 Exclude from BP count.
15 - 1 Ignore V so it will not be passed into
memory.
16 - 0 OW-2 not required.
17 - Parity.
• 1. Receive/Transmit set to 1 - present only when receiving NDB set to
o -
system should be out of data block when Z is received. Sequence
counter set to 00 - Not incremented as of yet.
2. OW -1 Bit Settings:
2, 1, 0 (Action Control) - 001, unconditional action.
3 - 0 Not Used.
4 - 0 Z should not reset NDB.
5 - 0 Z should not reset NDB.
6 - 0 Do not inhibit resetting of Sequence
counter.
8, 7 - 11 Trigger sequence counter upon re-
cognition of this character.
12-9 - 0000 No action by CRB.
13 - 0 Do not terminate existing command
(receive) .
14 - 0 Exclude this character from BP count.
15 - 1 Ignore 2 so that it will not be passed
to memory.
16 - 0 OW-2 not required.
17 - Parity.
• 1. Receive/Transmit set to 1 - present only when receiving NDB set
to 0 - system should be out of data block when C is received. Se-
quence counter set to 01 prior to the time C is received.
2. OW -1 Bit Settings:
2, 1, 0 (Action Control) - 001, unconditional action.
3 - 0 Not Used.
2-6