Epson EPL-N4000 Service Manual page 255

EPSON EPL-N4000/EPL-N4000+
Figure 7-12. C262 Main Controller
Rev.B
ESS PWB MCU PWB
Table 7-10. Signal Name
Signal Name
/SBSY Status busy signal. Low=Transmitting signal. High=Not
transmitting
/STA Status from MCU to ESS
/CMD Command from ESS to MCU
/PCLK Clock signal which is sent from the printer to ESS, and
command timing for sending the status. Clock speed is
9600 bps
/CCLK Clock signal for status and command timing - ESS to
MCU. Clock speed 9.6kHz ~ 500kHz
/CBSY Command busy signal - ESS to MCU
Low=ESS is transmitting command. High=ESS is not
transmitting.
/PPRDY Status indicating MCU initialization is complete and
printer is On-Line. Low=Printer initialization complete.
High=Printer initialization not complete
/CPRDY Status indicating ESS initialization is complete.
Low=ESS initialization complete. High=ESS initialization
not complete
/RDY Status indicating that the MCU is ready to accept control
commands. Low=Accept commands. High=Ignore
commands
/START Command from ESS to the MCU to begin a print cycle.
Low=Start. High=Do not start. Starts print cycle only
when /RDY is also Low.
/PRFD Command from the ESS to the MCU to feed paper
/TOP Video data synch signal from MCU to ESS
DSEL Command to select the No Paper signal
/BD Video data synch signal from MCU to ESS
VOUT Video data signal from the ESS Low=Black, High=White
Chapter 7 Appendix
Description
241