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3-4.
Hardware Handshake
This chapter provides the information on the sequence of hardware handshake.
It is based on the presumption that RTS and CTS signals stay at H-level after the initialization.
(1)
Sending command from the host system to this scan engine
1) The host system confirms that CTS signal is at H-level
2) The host system shows that there is command data being sent by setting RTS signal to
L-level.
3) This scan engine detects that CTS signal has been changed to L-level and shows that it
is possible to receive the command by changing RTS signal to L- level.
4) The host system detects that CTS signal has been changed to L-level and transmits data
to TXD signal.
5) When transmission of the last data character completes, the host system sets back RTS
signal to H-level.
6) This scan engine detects that CTS signal has been set back to the H-level and sets back
RTS signal to the H level.
(2)
Sending data from this scan engine to the host system
7) This scan engine confirms that CTS signal has been set to H-level.
When CTS signal stays at L-level, it is deemed that there is a command being sent from
the host system so that the data transmission shall be cancelled.
8) The decoder transmits the data to TXD signal.
When CTS signal is set to L-level while the data is under transmission, it is deemed that
there is a command being sent from the host system and data transmission shall be
cancelled to prioritize reception of command.
When the data transmission is cancelled to prioritize reception of command, the data
shall be resent after reception of command.
When there is no command being sent from the host system and CTS signal is set back
to H-level, cancelled data transmission shall restart.
12
OPTICON
Software Guide
MDL-1000/2000
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