Communications Line Flow, Loop - IBM 3274 51C Maintenance Information

HPCA
A1·H2
U12
S10
S02
U09
S05
S13
-Data Term Rdy ...
..
·-Req to Send
..
......
-Data Rate Sel
..
.
-Sel Standby
..
..
-Test
... .
I....
-Data Set Rdy
....
S12
'-- -Clear to Send
S04
Ull
Ul0
U04
U13
S03
/
/
/
/
,I
Line
...
L..
-Carrier Det
....
_ -Xmit Clk
r-
_ -Rev Clk
....
Xmit Data
..
-..
i..a
Rev Data
...
New Sync
...
..
POR ____
DC Voltage
Active OV
Inactive
+5V
Open
+1.5V
Loop Adapter
A1·G2
B02
G02
002
J05
B04 G09
B03
J13
B05
B13 G07
013
G08
B12 J08
B07
012
B08
004
Bl0
B09
011
""
.....
"'- .....
.....
.....
DC Voltage
Range
o
to +0.4V
+Data ..
y
-Data
..
-..
... +Rcv
...
I..-
-Rev
...
Rly 1
. .
Rly 2
...
.
Gnd
See
Note
....
+2.4 to +5.5V
+1 to +2V
Board
Conn
A1·Y1
C1A11
C1B13
A1E13
C1E13
B1A13
A1D13
Bl E11
Cable
Pin
009
B10
B03
B13
B04
B02
008
Internal
Cable
PN 5267854
/ '
. /
, /
/ '
...
...
..
..
..
...
!
...
..
...
~
41'
. /
3274
1/0 Conn
n
, ,
,
,
,
,
" ,
~
~
_'.II.
,
L.J
/ '
. /
10
9
12
11
6
20
7
+Data (White)
-Data (Red)
+Rec (Orange)
-Rec (Blue)
Pick Relay 1 (Yellow)
Pick Relay 2 (Purple)
Gnd (Black)
-
Frame
Ground
/
Use 008 for ground reference.
/ '
/ '
/
, /
/ '
/ '
C:I:~
./ ./ From Control Unit""" ......
. / 1/0 Connector .......
345 678 910111213
0 0 0 • • 0 • • • • 0
0 0 0 0 0 0 . 0 0 0 0 0
141516171819202122232425
25-Pin Connector (Male)
PN 1714970 1.83m (6 fd
PN 1714971 4.27m (14 ft)
/
/
/
I
il~
8·Pin
Connector
I
I
I
I
Loop Station
. Connector
r·"
/
I
/
I
I
I
/
>
3
>
2
>
5
>
4
>
6
>
7
>
8
>
Note: This pin goes to the Local/Comm switch in the Operator Panel. See Figure 0·10, a foldout at the back of the manual (page FO-lJ.
Figure 5·6. Communications Line Flow, Loop
Chapter 5. Communications Reference Data 5-9