Rs-422/485 Connection Procedure - YOKOGAWA GX10 User Manual

1.2 Operations over the Serial Interface (RS-232, RS-422/485, USB, Bluetooth)
1.2.4

RS-422/485 Connection Procedure

1-6
Connect a cable to the terminal.
Connection
• Connecting the Cable
As shown in the figure below, remove approximately 6 mm of the covering from the end of
the cable to expose the conductor. Keep the exposed section from the end of the shield
within 5 cm.
Four-wire system
FG SDB+ RDB+
SG SDA−
Shield
Electric potential
of the shield
• Signal names
Each terminal corresponds to the signal indicated below.
Signal Name Meaning
FG Frame ground of the recorder.
SG Signal ground.
SDB+ Send data B (+).
SDA– Send data A (–).
RDB+ Receive data B (+).
RDA– Receive data A (–).
Connecting to the host device
The figure below illustrates the connection of the recorder to a host device. If the port on the
host device is an RS-232 interface, connect a converter.
Host computer
or host device
Host device side
RS-422/485
Host computer
Converter
RS-232
Connection example to the host device
A connection can be made with a host device having a RS-232, RS422, or RS-485 port. In
the case of RS-232, a converter is used. See the connection examples below for a typical
converter terminal. For details, see the manual that comes with the converter.
RS-422/485 Port
SDA(–)
SDB(+)
RDA(–)
RDB(+)
SG
FG
There is no problem of connecting a 220-Ω terminator at either end if YOKOGAWA's PLCs
or temperature controllers are also connected to the communication line.
Two-wire system
FG SDB+
SG SDA−
RDA−
Electric potential
of the shield
Host device side
RS-422/485
Converter
TD(–)
TD(+)
RD(–)
RD(+)
SHIELD
EARTH
Shield
Recommended torque
for tightening the screw: 0.2 N•m
RS-422/485
terminal on the recorder
RS-422/485
terminal on the recorder
IM 04L51B01-17EN