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3-5.
Communication Procedure (example)
This chapter provides the information on the communication procedure between this scan engine
and the host system. The sequence of this procedure is as follows:
(1)
Transfer of the command data packet from the host system to this scan
engine
TXD
(Host RXD)
RXD
(Host TXD)
RTS
(Host CTS)
CTS
(Host RTS)
1) The host system sets RTS signal to L-level for the data packet transmission.
2) This scan engine detects that CTS signal has been set to L-level and sets RTS signal to
the L-level.
3) The host system confirms that CTS signal has been set to L-level and starts
transmission of command data packets.
4) The host system sets back RTS signal to H-level after transmission.
5) This scan engine confirms that CTS signal has been set back to H-level and sets back
the RTS signal to H-level.
6) This scan engine sends back responses.
Note: When ACK/NAK protocol is not selected, the sequence of procedure described in 6)
shall not occure. Also, ACK response shall not be sent for the command below. It is a
command to send back the response data from this scan engine.
PARAM_REQ/REQ_REV
3)
2)
5)
1)
4)
13
6)
OPTICON
Software Guide
MDL-1000/2000
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