Read Sharp ER-A490 (serv.man4) Service Manual online
CHAPTER 7. CONTROL SIGNAL SEQUENCE
1. Online transmission
1) Half duplex transmission
2) Full duplex transmission
*Note: In the direct connect mode, same as full duplex control, but
the CI signal is not controlled.
3) Line connection sequence flow
DATA
SD
DTE
DCE
DATA
RD
RTS
CTS
DSR
DCD
DTR
CI
< 100ms
< 500ms
DATA
SD
DTE
DCE
DATA
RD
RTS
CTS
DSR
DCD
DTR
CI
< 100ms
< 500ms
*
STARTED BY P.C
INITIAL
CI SENSE ?
CI ON ?
DTR ON
DSR ON ?
FULL DUPLEX ?
RTS ON
LINE ESTABLISHED
NO
NO
NO
NO
NO
NO
YES
YES
CI SENSE ?
TIME OUT ?
YES
YES
YES
Note : The CI signal can be changed over when
so set in the PGM mode, and effective
at ECR side.
so set in the PGM mode, and effective
at ECR side.
30sec
ERROR : NO LINE
DTR OFF
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