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Xmit-RTS Delay Count;
Recv-End Delay Count
Byte
Byte
Byte
~"-'"~M~1~~----~2~-.i-4-~~
3
Bit
Rec
Xmt
Timeout
Update
Trap
Control
Count
Count Field
&
Ctr
Out
Bit Trap
Field
Char Asm/
Dism
0
34
!i67
\
Recv'g Character/Run Timeout
(If Timeout Control)
Receiving: ATS De:lay Control
Transmit Receive
Character
Buffer
LCW Byte 0
XMIT CONTROL
0
Character Buffer Full
Byte
4
State
State
Hi
Lo
BIT
6
7
DECODE
1
Recv. Data Lost (Recv); Pad Control (Write)
HEX
2 T.O. Control
0
0 0
3
Poll Flag (IBM)
1
0
1 Transmit Normal
4
'O' (Start/stop LCW)
Byte
- s
Byte
- s
Byte
- 1
LAC (IBM-1)
IBM Poll Index
Sense
Prep Break
Byte Store
Count
&
or
Backup Buffer
Backup Buffer
(Xmit IBM-1)
Byte
(Xmit TTY-1)
0
Sense Bit 0 Command Reject
1 Sense Bit 1 Intervention Required
2
Unit Exception Status Remember
3 Sense Bit 3 Equipment Check
4
Sense Bit 4 Data Check
2
0
Transmit Break
6
Telegraph Adapter Echo check or TTY 11 Break
5
Sense Bit 5 Overrun
(TTY)
Detected ( Xmit)
6
TTY 11 Space Remem (Xmit) Stop Bit Error (Recv)
6
Sense Bit 6 Lost Data
3
Transmit End
7
Data Bit Transfer Check (Xmit)
7
Sense Bit 7 Timeout Complete
LCW BYTE
0
BIT COUNT FIELD DECODE
RECEIVING
TRANSMITTING
BIT
0
2
3
TTY IBM IBM TTY
TTY IBM IBM TTY
HEX
II
II
II
II
0
0
0
0
0
Pad Start Bit
1
0
0
0
1
Normal Data Bit
First Data Bit
1
B
B
2
0
0
0
Normal Data Bit
2
Normal Data Bit
2
3
0
0
1
1
Normal Data Bit 3
A
A
Normal Data Bit
3
A
A
4
0
0
0
Normal Data Bit 4
8
8
Normal Data Bit
4
8
8
5
0
0
1
Normal Data Bit
5
4
4
2
Normal Data Bit
5
4
4
2
6
0
0
Normal Data Bit
6
2
2
3
Normal Data Bit
6
2
2
3
7
0
1
1
Normal Data Bit 7
1
1
4
Normal Data Bit
7
1
1
4
8
0
0
0
Last Data Bit
8
c c
5
Normal Data Bit
8
c
c
5
9
1 0
0
1 Stop Bit
Stop 1 Bit (IBM-II.TTY-II)
s
s
A
1
0
0
Xmit RTS Delay
Xmit CTS Test
B
0
1
1
Enable Dial DCD Test
Normal Start Bit
c
0
0
Recv. End Delay
Transmit End 1
D
0
E
0
First Data Bit
B
B
Transmit End 2
F
1
Final Stop Bit
Figure 1-72.
Start/Stop LCW Format (Part 1 of 2)
2025 FEMM (7/69) 1-83
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