103
5. PARAMETERS
5.7 (N) Communication operation parameters
1
2
3
4
5
6
7
8
9
10
5.7.2
Wiring and configuration of RS-485 terminals
RS-485 terminal layout
Connection of RS-485 terminals and wires
• The size of RS-485 terminal block is the same as that of the control circuit terminal block. Refer to
for the wiring
method.
NOTE
• To avoid malfunction, keep the RS-485 terminal wires away from the control circuit board.
System configuration of RS-485 terminals
• Computer and converter unit connection (1:1)
Name
Description
RDA1 (RXD1+) Converter unit r
RDB1 (RXD1-)
Converter unit receive -
RDA2 (RXD2+) Converter unit r (for branch)
RDB2 (RXD2-)
Converter unit receive - (for branch)
SDA1 (TXD1+)
Converter unit send +
SDB1 (TXD1-)
Converter unit send -
SDA2 (TXD2+)
Converter unit send + (for branch)
SDB2 (TXD2-)
Converter unit send - (for branch)
P5S (VCC)
5 V (permissible load current 100 mA)
SG (GND)
Earthing (grounding) (connected to terminal SD)
+
-
+ TXD
RXD
-
VCC
GND
+
-
+ TXD
RXD
-
VCC
GND
OPEN
100Ω
RDA1
(RXD1+)
RDB1
(RXD1-)
RDA2
(RXD2+)
RDB2
(RXD2-)
SDA1
(TXD1+)
SDB1
(TXD1-)
SDA2
(TXD2+)
SDB2
(TXD2-)
P5S
(VCC)
SG
(GND)
P5S
(VCC)
SG
(GND)
Terminating resistor switch
Initially-set to "OPEN".
Set only the terminating resistor switch of
the remotest converter unit to the "100 Ω" position.
Computer
Twisted pair cable
Twisted pair cable
∗
Set the terminating resistor switch to the "100
Ω
" position.
Converter
unit
Converter
unit
RS-485
terminals
∗
Computer
Converter
RS-232C
cable
RS-485
terminals
∗
RS-485
interface/
terminals
Maximum
15 m
Содержание FR-CC2-N Series
Страница 61: ...60 3 PRECAUTIONS FOR USE OF THE CONVERTER UNIT 3 4 Checklist before starting operation MEMO ...
Страница 137: ...136 5 PARAMETERS 5 10 Checking parameters changed from their initial values initial value change list MEMO ...
Страница 153: ...152 6 PROTECTIVE FUNCTIONS 6 6 Check first when you have a trouble MEMO ...
Страница 165: ...164 7 PRECAUTIONS FOR MAINTENANCE AND INSPECTION 7 2 Measurement of main circuit voltages currents and powers MEMO ...
Страница 171: ...170 8 SPECIFICATIONS 8 3 Outline dimension drawings MEMO ...