YOKOGAWA GX10 User Manual page 15
Gx series; gp series; gm series; smartdac+ communication command
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- User manual (590 pages) ,
- User manual (24 pages) ,
- User manual (22 pages)
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Terminator (external) 120 Ω 1/2W or greater
Host device
side
SDA( – )
SDB( + )
RDA( – )
RDB( + )
SG
Terminator (external) 120 Ω 1/2W or greater
Host device
SDA( – )
SDB( + )
RDA( – )
RDB( + )
SG
IM 04L51B01-17EN
1.2 Operations over the Serial Interface (RS-232, RS-422/485, USB, Bluetooth)
• Four-wire system
Generally, a four-wire system is used to connect to a host device. In the case of a four-
wire system, the transmission and reception lines need to be crossed over.
RS-422/485
terminal on the recorder
SDA–
–
(SDA
)
SDB+
+
(SDB
)
RDA–
–
(RDA
)
RDB+
+
(RDB
)
SG
(SG)
FG
#1
• Two-wire system
Connect the transmission and reception signals with the same polarity on the RS-422/485
terminal block. Only two wires are used to connect to the external device.
RS-422/485
terminal on the recorder
SDA–
–
(A
)
SDB+
(B+)
RDA–
RDB+
SG
(SG)
FG
#1
Note
•
The method used to eliminate noise varies depending on the situation. In the connection
example, the shield of the cable is connected only to the recorder's ground (one-sided
grounding). This is effective when there is a difference in the electric potential between
the computer's ground and the recorder's ground. This may be the case for long distance
communications. If there is no difference in the electric potential between the computer's ground
and the recorder's ground, the method of connecting the shield also to the computer's ground
may be effective (two-sided grounding). In addition, in some cases, using two-sided grounding
with a capacitor connected in series on one side is effective. Consider these possibilities to
eliminate noise.
•
When using the two-wire interface (Modbus protocol), the 485 driver must be set to high
impedance within 3.5 characters after the last data byte is sent by the host computer.
SDA–
–
(SDA
)
SDB+
+
(SDB
)
RDA–
–
(RDA
)
RDB+
+
(RDB
)
SG
(SG)
FG
#2
Do not connect terminators to #1 through #n-1.
SDA–
–
(A
)
SDB+
(B+)
RDA–
RDB+
SG
(SG)
FG
#2
Do not connect terminators to #1 through #n-1.
Terminator (external)
SDA–
–
(SDA
)
SDB+
+
(SDB
)
RDA–
–
(RDA
)
RDB+
+
(RDB
)
SG
(SG)
FG
#n
(#n
32)
Terminator (external)
SDA–
–
(A
)
SDB+
(B+)
RDA–
RDB+
SG
(SG)
FG
#n
(#n
31)
1-7
1
2
App
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