7. Printer parallel interface RP80VI printer parallel interface socket is 25PIN Parallel socket,8 bits parallel transmission,support BUSY/nAck handshake protocol.Each PIN function of Printer parallel interface socket are as follows: PIN Signal Signal Description no. name source Data gate trigger pulse,it will read-in data 1 /STB Host when negative edge 2 DATA2 Host These signals separately represents NO.1 to No.8 information of Parallel data.And 3 DATA3 Host when logic is 1,it is high level,when logic is 0,it is low level. 4 DATA4 Host 5 DATA5 Host 6 DATA6 Host 7 DATA7 Host 8 DATA8 Host 9 DATA9 Host 10 nAck Printer Printer answering signal,It shows printer has received previous byte data High level shows printer is busy,it can 11 BUSY Printer not receive data ground connection,Logic low level 12 GND ----- 13 Select Printer By resistance to pull high level
7. Printer parallel interface RP80VI printer parallel interface socket is 25PIN Parallel socket,8 bits parallel transmission,support BUSY/nAck handshake protocol.Each PIN function of Printer parallel interface socket are as follows: PIN no. Signal name Signal source Description 1 /STB Host Data gate trigger pulse,it will read-in data when negative edge 2 3 4 5 6 7 8 9 DATA2 DATA3 DATA4 DATA5 DATA6 DATA7 DATA8 DATA9 Host Host Host Host Host Host Host Host These signals separately represents NO.1 to No.8 information of Parallel data.And when logic is 1,it is high level,when logic is 0,it is low level. 10 nAck Printer Printer answering signal,It shows printer has received previous byte data 11 BUSY Printer High level shows printer is busy,it can not receive data 12 GND ----- ground connection,Logic low level 13 Select Printer By resistance to pull high level
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