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SERIAL  PARALLEL  PINOUTS

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SERIAL PORT PINOUTS

 

Signal Full Name DB-9 Pin DB-25 Pin
DCD Data Carrier Detect 1 8
RXD Receive Data 2 3
TXD Transmit Data 3 2
DTR Data Terminal Ready 4 20
GND Signal Ground 5 7
DSR Data Set Ready 6 6
RTS Request To Send 7 4
CTS Clear To Send 8 5
RI Ready Indicator 9 22

 

PARALLEL PORT PINOUTS


 

Standard Parallel Port (SPP)
Signal Name Centronics
(37-pin)
DB-25
(25-pin)
STROBE 1 1
DATA 0 2 2
DATA 1 3 3
DATA 2 4 4
DATA 3 5 4
DATA 4 6 6
DATA 5 7 7
DATA 6 8 8
DATA 7 9 9
ACK 10 10
BUSY 11 11
PAPER EMPTY 12 12
ON LINE 13 13
NOT USED 14, 15, 33 -- 36 17
GROUND 16, 17, 19 -- 30 18-25
PRINTER ON 18  
RESET 31 16
ERROR 32 15
Enhanced Parallel Port (EPP)
Signal Name DB-25
(25-pin)
WRITE 1
DATA 0 2
DATA 1 3
DATA 2 4
DATA 3 5
DATA 4 6
DATA 5 7
DATA 6 8
DATA 7 9
ACK 10
BUSY 11
PAPER EMPTY 12
SELECT 13
AUTO LINE FEED 14
ERROR/FAULT 15
INITIALIZE 16
SELECT PRINTER 17
GROUND 18-25