104
5. PARAMETERS
5.7 (N) Communication operation parameters
• Combination of a computer and multiple converter units (1:n)
RS-485 terminal wiring method
• Wiring between a computer and a converter unit for RS-485 communications
• Wiring between a computer and multiple converter units for RS-485 communication
*1
Make connection in accordance with the Instruction Manual of the computer to be used with.
Fully check the terminal numbers of the computer since they vary with the model.
*2
On the converter unit most remotely connected with the computer, set the terminating resistor switch in the ON (100
Ω
) position.
Computer
Twisted pair cable
Twisted pair cable
RS-485
interface terminals
Converter
unit
Converter
unit
Converter
unit
Converter
unit
Converter
unit
Converter
unit
RS-485
terminals
∗
RS-485
terminals
∗
RS-485
terminals
∗
Station 0
Station 1
Station n
∗
Set only the terminating resistor switch of the
remotest converter unit to the "100
Ω
" position.
∗
Set only the terminating resistor switch of the
remotest converter unit to the "100
Ω
" position.
Computer
RS-232C
converter
RS-232C
cable
Maximum
15 m
Converter
Station 0
Station 1
Station n
RS-485
terminals
∗
RS-485
terminals
∗
RS-485
terminals
∗
∗1
Computer
RDA
RDB
SDA
SDB
RSA
SG
RSB
CSA
CSB
FG
SG
∗2
-
+
-
+
SDB1
SDA1
RDB1
RDA1
∗1
Computer
RDA
RDB
SDA
SDB
RSA
SG
RSB
CSA
CSB
FG
Station 0
SG
SG
-
+ -
+
-
+ -
+
Station 1
SG
SG
-
+
+
-
-
+
+
-
Station n
SG
∗2
-
+
SDB1
SDA1
RDB1
RDA1
RDA2
RDB2
SDA2
SDB2
SDB1
SDA1
RDB1
RDA1
SDB1
SDA1
RDB1
RDA1
RDA2
RDB2
SDA2
SDB2
-
+