Black Box V.24/X.21, User Manual, Page: 9 / 9

9
V.24/X.21 AND X.21/V.24 INTERFACE CONVERTERS
Figure 6-2. IC944A Pinning.
I-b
I-a
C-b
C-a
S-b
S-a
T-b
T-a
R-b
R-a
Shield
Signal GND
RTS
DCD
TC
RC
TD
RD
4
8
15
17
2
3
6
9
2
11
4
X.21 DTE/V.24 DCE
Schematic Diagram
Protective GND
1
Signal GND
7
DSR
DTR
20
Ck In
Data In
Ck In
Data Out
Elastic
Buffer
+
-
+
-
V.24 (DCE)
DB25 (Male)
X.21 (DTE)
DB15 (Female)
12
5
10
3
13
1
8
6