Figure D-2. Bsc Control Unit Address Switch Setting - IBM 3270 Manual

Control Unit Address
EBCDIC EBCDIC ASCII
Poll Selection Poll
Address Address Address
{Hex) {Hex) (Hex)
40 60 20
C1 61 41
C2
E2
42
C3
E3 43
C4
E4 44
C5
E5 45
C6
E6
46
C7
E7 47
C8
E8
48
C9
E9 49
4A 6A 58
48 68 2E
14C
6C
3C
40 60
28
l4E
6E
28
4F 6F
21
1
"8" Switches
1 =Switch ON
0 =Switch OFF
ASCII BSC
Selection Address
Address CU No. Switches
{Hex) {Decimal) 12345
20 0 00000
2F
1
00001
53 2
00010
54 3
00011
55 4 00100
56 5 00101
57 6 00110
58 7 00111
59 8 01000
5A
9
01001
7C
10 01010
2C 11 01011
25 12 01100
5F
13
01101
3E 14
01110
3F 15 01111
Control Unit Address
EBCDIC EBCDIC ASCII ASCII BSC
Poll Selection Poll Selection Address
Address Address Address Address CU No. Switches
{Hex) {Hex)
{Hex)
(Hex) (Decimal)
12345
50
FO 26
30
16
10000
01
F1 4A 31 17 10001
02 F2 48 32 18 10010
03 F3 4C 33 19 10011
04 F4 40 34 20 10100
05 F5 4E 35 21 10101
06 F6 4F 36 22 10110
07 F7
50
37 23 10111
08
F8
51 38
24 11000
09 F9 52
39
25 11001
5A 7A 50 3A 26 11010
58 78 24 23
27
11011
5C
7C
2A
40 28 11100
50 70 29 27 29 11101
5E 7E 38 30 30 11110
5F 7F 5E 22 31 11111
Figure D-2. BSC Control Unit Address Switch Setting (Switches Bl-85)
In the FDX (ON) position and
• When SDLC protocol is being used, this switch causes continuous carrier operation by
keeping Request to Send on continuously.
• When BSC protocol is being used, this switch causes continuous carrier operation only
when the 3276 is selected (to avoid turnaround time). When EOT is detected (sent
from either end of the line), carrier operation is turned off.
The switch should be set to FDX (ON) when:
• BSC protocol is being used in 4-wire, point-to-point operation.
• SDLC protocol is being used in 4-wire, point-to-point operation.
In addition,
• If the 32 76 is configured for leased-line operation (for example, by Special Feature
3701, External Modem Interface, and Specify Feature 9491, for operation on private
nonswitched communication facilities), a jumper wire is installed at the plant of
manufacture. The jumper permits switch B6 to be used on a leased line, selecting
either continuous carrier or noncontinuous carrier as described above. However, if the
leased line goes down, and the terminal is to operate in switched network backup
(SNBU) mode, setting the SNBU switch in the SNBU (UP) position forces
noncontinuous carrier operation (that is, switch B6 is not operative).
• If the 3276 is configured for full-time switched network operation (that is by Special
Feature 3701, External Modem Interface, and Specify Feature 9490, for SDLC
operation on public switched network), the jumper wire is omitted. Switch B6 is
disabled, and half-duplex (noncontinuous carrier operation) is forced.
The switch should be set as summarized in Figure D-3.
The example (Figure D-6) shows how the 3276 Switch Settings Form should be filled in
to set the switch for FDX. Fill in the switch B6 portion of item 2 on the form.
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