Yokogawa Removable Chassis DX1000N - Manual (Page 101)

2-7
IM 04L41B01-17E
Using the Serial Interface
1
2
3
4
5
6
App
Index
RS-422/485 Connection Procedure
Terminal arrangement and signal names
Connect a cable to the clamp terminal.
(rear panel) FG SDB RDB
SG SDA RDA
Each terminal corresponds to the signal indicated below.
Signal Name Meaning
FG Frame ground of the DX.
SG Signal ground.
SDB Send data B (+).
SDA Send data A (–).
RDB Receive data B (+).
RDA Receive data A (–).
Connection
• Connecting the Cable
As shown in the figure below, remove approximately 5 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.
• Connection of a four-wire system
RDB
RDA SDA
SDB
SG
FG
Electric potential
of the shield
Shield
Connecting to the host device
The figure below illustrates the connection of the DX to a host device. If the port on the
host device is an RS-232 interface, connect a converter.
RS-422/485
terminal on the DX
Host computer
or host device
Host device side
Converter
RS-422/485
RS-422/485
terminal on the DX
Host computer
RS-232 RS-422/485
Host device side
2.3 Connecting the DX