Yokogawa Value Series FX1000 - Manual (Page 71)

2-7
IM 04L21B01-17EN
Using the Serial Communication Interface (/C2 and /C3 Options)
1
2
3
4
5
6
App
Index
RS-422A/485 Connection Procedure
Terminal arrangement and signal names
Connect a cable to the clamp terminal.
FG (Frame Ground) 本機器本体のケース接地です。
SG (Signal Ground) 信号用接地です。
SDB (Send Data B) 送信データB(＋)です。
SDA (Send Data A) 送信データA(−)です。
RDB (Received Data B) 受信データB(＋)です。
RDA (Received Data A) 受信データA(−)です。
2線式
FG SG SDB SDA RDB RDA
シールド電位
4線式
シールド
FG SG SDB SDA RDB RDA
(rear panel)
RS-422A/485 interface terminal
A serial communication terminal that
comes with the /C3 option
Each terminal corresponds to the signal indicated below.
Signal Name Meaning
FG Frame ground of the FX.
SG Signal ground.
SDB Send data B (+).
SDA Send data A (–).
RDB Receive data B (+).
RDA Receive data A (–).
Connection
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.
Two-wire system
FG SG SDB SDA RDB RDA
Electric potential
of the shield
Four-wire system
Shield
FG SG SDB SDA RDB RDA
Connecting to the host device
The figure below illustrates the connection of the FX to a host device. If the port on the
host device is an RS-232 interface, connect a converter.
RS-422A/485
terminal on the FX
Host computer
or host device
Host device side
Converter
RS-422A/485
RS-422A/485
terminal on the FX
Host computer
RS-232 RS-422A/485
Host device side
2.3 Connecting the FX