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This time is required whether data is transferred or not. Also, this time is required for a
simplex, half-duplex, or full-duplex channel.
The SCN instruction uses the A and B registers, and the previous contents will be destroyed.
Also
the C-register will contain Cf after it is completed. At the end of a Transmission, the
last word placed in scan word one continues to be transmitted. It is necessary to put a word
of all marks in scan word one for idle line condition.
DEFl, DEF2, DEF5, NESl, NES2, and all data transfer is handled automatically by the SCN
instruction.
The program must, however, give the DEF3 and DEF4 instructions appropriately.
Scan Word 1
0
0
0
0
0
18
14
13
[SWlFl
the next character to be
transmitted.
1
It
is possible to transmit 5-, 6-, 7-, and 8-level codes of 8, 9, 10, and 11 bits. The format
for 5-level, 8-unit codes is:
Spare Bits must be Zero
End-of-Character Bit
I
Stop Bits
Data Bits
Start Bit
0
0
0
0
1
1
1
D
D
D
D
D
13
12
11
10
9
8
7
6
5
4
3
2
1
[ID£11&~~11CJ ~@------------
V-12
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