Canon PowerShot 350 Service Manual - Page 46

Communication

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Part 2: Technical Information 3. COMMUNICATION WITH PC 3.1 PC CABLE A special communications cable is necessary for connecting to and communacating between the PowerShot 350 and a Personal Computer. This cable contains a circuit for adjusting the output level of the PowerShot 350 to the RS-232C de facto standard for Personal Computers. It has another buffered circuit for matching the communications speed of the PowerShot 350 (127.840kbps) to the Personal Computer's communication speed (9.6, 19.2, 38.4, 57.6, or 115.2kbps). This cable takes its five volt power from the PowerShot 350. PS350 IFC-35D PC UARTO GND UART1 5V 1 UART1 2 +5V 3 4 UARTO 5 GND 1 DCD 2 Rxd 3 Txd 4 DTR 5 SG 6 DSR 7 RST 8 CTS 9 RI Fig. 2-9 Cable Terminals 3.2 CONNECTION TO VARIOUS OPERATING SYSTEMS This cable is all that is required for connecting to a computer running DOS/V (WIN/TEL). To connect to a computer running the MAC O/S, the commercially available adaptor cable (Dsub9pin to Round 8pin) is additionally required. To connect to the Japanese NEC PC-9800 series, a Dsub9pin to Dsub25pin adaptor is required. 2-14

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Part
2:
Technical
Information
3.
COMMUNICATION
WITH
PC
3.1
PC
CABLE
A
special
communications
cable
is
necessary
for
connecting
to
and
communacating
between
the
PowerShot
350
and
a
Personal
Computer.
This
cable
contains
a
circuit
for
adjusting
the
output
level
of
the
PowerShot
350
to
the
RS
-232C
de
facto
standard
for
Personal
Computers.
It
has
another
buffered
circuit
for
matching
the
communications
speed
of
the
PowerShot
350
(127.840kbps)
to
the
Personal
Computer's
communication
speed
(9.6,
19.2,
38.4,
57.6,
or
115.2kbps).
This
cable
takes
its
five
volt
power
from
the
PowerShot
350.
PS350
UARTO
GND
UART1
5V
I
FC-35D
PC
1
DCD
1
UART1
2
Rxd
2
+5V
3
Txd
3
4
DTR
4
UARTO
5
SG
5
GND
6
DSR
7
RST
8
CTS
9
RI
Fig.
2-9
Cable
Terminals
3.2
CONNECTION
TO
VARIOUS
OPERATING
SYSTEMS
This
cable
is
all
that
is
required
for
connecting
to
a
computer
running
DOS/V
(WIN/TEL).
To
connect
to
a
computer
running
the
MAC
O/S,
the
commercially
available
adaptor
cable
(Dsub9pin
to
Round
8pin)
is
additionally
required.
To
connect
to
the
Japanese
NEC
PC
-9800
series,
a
Dsub9pin
to
Dsub25pin
adaptor
is
required.
2-14