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Models IC and SIC
310 Modem Connection
311 Modem Wrap
3-24
BSC Hexadecimal
Control Unit
Polling
Number
Address
(Sequence
Number 301
EBCDIC
ASCII
Resp~nse)
40
20
00
C1
41
01
C2
42
02
C3
43
03
C4
44
04
C5
45
05
C6
46
06
C7
47
07
C8
48
08
C9
49
09
4A
5B
10
4B
2E
11
4C
3C
12
40
28
13
II
2B
II
4F
21
15
50
26
16
01
4A
17
02
4B
18
03
4C
19
04
40
20
05
II
II
06
4F
22
07
50
23
08
51
24
09
52
25
5A
50
26
58
24
27
5C
2A
28
50
29
29
5E
3B
30
5F
5E
31
Example: If the EBCDIC hexadecimal BSC polling address is 4E, the value to be entered
is 14. If the ASCII hexadecimal BSC polling address is 4E, the value to be entered is 21.
Figure 3-7. BSC Polling Address/Control Unit Number Conversion Chart
Enter a 0 if the 3274 is operating in Canada or in the U.S. For World Trade countries,
enter a 0 if the 3274 is operating in Request to Send/Clear to Send (RTS/CTS) mode.
Enter a 1 if the 3274 is connected to a CCITT 108.1 (COSTL). (This applies to the SIC
only when the CCITT 108.1 is connected to a switched network.)
Enter a 0 if the modem is not capable of a OTE-initiated automatic wrap test or a I if the
modem is. (In this case, the OTE is the 3274 Control Unit. The wrap test is initiated by
the CX Test (OTE) control signal option via pin 18 from the 3274 Control Unit.)
If an IBM 3872, 3874, or 3875 modem is used, enter a 1 if the CX Test (OTE) control
signal option was activated at the time of modem installation.
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