Yokogawa DR240 Manual do Utilizador Página 23

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3-4
IM DR231-11E
Connecting to the Host Computer
Can be connected to a host computer with RS-232-C, RS-422-A, RS-485 ports.
In the case of RS-232-C, a converter is used as shown in the diagram below.
For information on recommended converters, refer to “Converters” in the latter.
Dip switch needs to be changed depending on whether it is a two-wire system or four-wire sys-
tem. Refer to “3.5 RS-422-A/RS-485 Interface Parameter Setting Procedure.”
In the case of four-wire system
In general, the recorder is wired to the host computer using a four-wire system. When four-wire
system is used, the send and receive wires need to be crossed.
Terminator (externally applied) 120 ohm, more than 1/2 W
#1
No terminators are inserted between #1 through #n-1 (internal OFF)
RS-422-A/RS-485
module
of the DA100/DR
#2 #n
(#n31)
Terminator (Internal ON)
Host
Computer
SG
RDB( + )
RDA( - )
SDB( + )
SDA( - )
FG
SG
RD B
RD A
SD B
SD A
(SG)
(RD B)
(RD A)
(SDB)
(SDA)
FG
SG
RD B
RD A
SD B
SD A
(SG)
(RD B)
(RD A)
(SDB)
(SDA)
FG
SG
RD B
RD A
SD B
SD A
(SG)
(RD B)
(RD A)
(SDB)
(SDA)
(Diagram below shows the case when the port of the host computer is RS-232-C)
Terminator (externally applied) 120 ohm, more than 1/2 W
#1
No terminators are inserted between #1 through #n-1 (internal OFF)
RS-422-A/RS-485
module
of the DA100/DR
#2 #n
(#n31)
Terminator (Internal ON)
SHIELD
RD( + )
RD( - )
TD( + )
TD( - )
FG
SG
RD B
RD A
SD B
SD A
Host
Computer
Converter
Z - 101HE
(SHARP)
(SG)
(RD B)
(RD A)
(SDB)
(SDA)
FG
SG
RD B
RD A
SD B
SD A
(SG)
(RD B)
(RD A)
(SDB)
(SDA)
FG
SG
RD B
RD A
SD B
SD A
(SG)
(RD B)
(RD A)
(SDB)
(SDA)
RS-232-C
3.3 RS-422-A/RS-485 Interface Connection
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