IBM 2702 Information Manual page 48

Start/Stop Terminal Controls
IBM Terminal Control-Type I
IBM Terminal Control-Type II Telegraph Terminal Control-Type II Telegraph Terminal Control-Type I
(1050,60, and 70. 2740,
( 1030.)
(TTY 33 and 35.)
(TTY 28 and 2712 M2.)
and 2741 with Interrupt)
Write
1.
VRC check. VRC check.
2. Echo check if Telegraph Break signal on Received Data line. Echo check.
feature is installed.
Read 1. VRC check. 1.
VRC check.
Inhibit
2. LRC check. 2.
@
response to a text
3.
@
response to a text message.
Line at space at stop bit time.
message.
3.
Line at space at stop bit
4. Line at space at stop bit
time.
time.
Poll
1.
VRC check.
2. Line at space at stop bit
1.
VRC check.
time.
2. Line of space at stop bit
3. Echo check if telegraph time.
feature is installed.
Response received was other than
@
or@ .
Wrap
VRC check. VRC check
Search Une at spoce at stop bit time.
Figure 2-15. Sense Bit 4, Data Check (Part 1, SIS)
Binary Synchronous Terminal Control
Read
1. CRC or lRC.
2.
VRC for ASCII Terminal Control.
3. Incorrect control character sequence in Transparent Mode.
Search
VRC for ASCII Terminal Control.
Add Prep
Poll
Figure 2-15. Sense Bit 4, Data Check (Part 2, BSC)
Start/Stap Terminal Controls
IBM Terminal Control- Type I
IBM Terminal Control-Type II
Telegraph Terminal Control-Type /I
Telegraph Terminal Control-Type
r
(1050,60, and 70. 2740,
(1030)
(TTY 33 and 35)
(TTY 28 and 2712 M2)
and 2741 with Interrupt)
Read
Data Svc not honored by channel before an additional character was requested to be stored.
Inhibit
On ending, data service still set when the command-end latch comes on.
Figure 2-16. Sense Bit 5, Overrun (Part 1, SIS)
Binary Synchronous Terminal Control
Read
Search
Data Svc request for one MDW not honored by channel by the time the second MDW is filled; four bytes of data are lost.
Figure 2-16. Sense Bit 5, Overrun (Part 2, BSe)
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