Canon RE-350, Control Interface Commands Manual

Page: 58 / 63

58
Mark Duration period
Min. Max.
T1 - 300ms
T2 0ms 200ms
T3 10ms T4-T2
T4 10ms *1
6.1 RTS/CTS Flow Control Timing Chart
PC SIDE SIGNAL
Command
C-Response
RTS
T1
T2
T3
T4
If the
PC
is ready to communicate with the
RE-350
, the
PC
should set the
RTS
line to
ON
. The
RE-350
will
recognize that its
RS-232C
connector is connected to the
PC
. When the
RTS
is
OFF
and the
PC
tries to send
some data, the
RE-350
will disregard the sent data.
Once the
RE-350
recognizes that the
RTS
of the
PC
is
ON
, the
RE-350
will set the
CTS
of the
PC
to
ON
within
T1
after
RTS
is
ON
. The application software on the
PC
can recognize if the
RE-350
is operating properly.
After the
PC
recognizes the
CTS
is
ON
, the
PC
can send the command packet to the
RE-350
.
Once the
RE-350
receives the command packet, the
RE-350
will set
CTS
to
OFF
and perform the operation
depending upon the command data from the
PC
to tell the
PC
that the
RE-350
cannot receive another
command packet during this period.
After finishing the operation, the
RE-350
will set
CTS
to
ON
to tell the
PC
that the
RE-350
can receive another
command packet.
At the same time, the
RE-350
will send the “C-response Packet” to notice the result of its operation. The
period (
T4
) between the reception and transmission of the “C-response Packet” is determined by the type of
command given.
6.0 Timing Charts
5
3
4
1
2
6
Note: If the
RE-350
does not follow the above timing chart, the power or connection of the
I/F
cable is
incorrect.
RXD
CTS
TXD
1
2
3
4
6
5