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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.