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Pin no. Signal name Direction Description
1 CD Input Carrier detection
2 RD Input Receive data
3 TD Output Send data
4 DTR Output Data terminal ready
5 GND – Ground
6 DSR Input Data set ready
7 RTS Output Send request
8 CTS Input Send enabled
9 RI Input Ring indication
Pin no. Signal name Direction Description
1 STROBE Input/output Strobe
2 DATA0 Input/output Data0
3 DATA1 Input/output Data1
4 DATA2 Input/output Data2
5 DATA3 Input/output Data3
6 DATA4 Input/output Data4
7 DATA5 Input/output Data5
8 DATA6 Input/output Data6
9 DATA7 Input/output Data7
10 ACK Input Acknowledge
11 BUSY Input Busy
12 PE Input Out of paper
13 SELECT Input Select
14 AUTOFD Output Automatic feed
15 ERROR Input Error
16 INIT Output Initialization
17 SLCTIN Output Select
18 to 25 GND – Ground
● Serial connector
13 1
25 14
15
69
●Parallel connector