7
CHAPTER 1: Specifications
1.2 Connector Pin Assignments (DB25 Male)
Name
Pin #
Mode
GND
Ground
7
—
RDB
RX+ Receive
Positive
16
Input
RDA
RX- Receive
Negative
3
Input
CTSB
CTS+
Clear to Send Positive
13
Input
CTSA
CTS-
Clear to Send Negative
5
Input
DSRB
DSR+
Data Set Ready Positive
22
Input
DSRA
DSR-
Data Set Ready Negative
6
Input
DCDB
DCD+
Data Carrier Detect Positive
10
Input
DCDA
DCD-
Data Carrier Detect Negative
8
Input
TDB
TX+
Transmit Positive
14
Output
TDA
TX-
Transmit Negative
2
Output
RTSB
RTS+
Request to Send Positive
19
Output
RTSA
RTS-
Request to Send Negative
4
Output
DTRB
DTR+
Data Terminal Ready Positive
23
Output
DTRA
DTR-
Data Terminal Ready Negative
20
Output
NOTE
These assignments meet EIA/TIA.ANSI-574 DTE
specifications for DB25 type connectors.
