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5.4 X.21 DB25(M) to DB15(F) adaptor Cable
For X.21 application, we must use the DB-25 to DB-15 adaptor cable for connects to a X.21
DTE DB-15 male cable.
The pin out of cable on DB-25(male) Connector to DB-15(Female) (X.21) Connector
DB-25 Pin
Signal
DB-15 (X.21) Pin
Description
1
FGND
1
Protective Ground
7
GND
8
Signal Ground
2
T
2
Transmit Data
14
T
9
Transmit Data
3
R
4
Receive Data
16
R
11
Receive Data
4
C
3
Request To Send
19
C
10
Request To Send
8
I
5
Data Carrier Detect
10
I
12
Data Carrier Detect
17
S
6
Receive Clock
9
S
13
Receive Clock
All signals are balanced. Meaning there is always a pair (+/-) for each signal, like used in
RS422. The X.21 signals are the same as RS422, so please refer to RS422 for the exact details.
The front view of DB-25(M) connector and DB-15(F) connector on this cable:
Dynamix UM-SN Ver.2 User Manual V1.03
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