<2.CONNECTION>
2-2
IM 11G02Q02-01EN 2nd Edition : Sep. 04, 2020-00
RTxD+
+
+
-
SG
-
+
-
RTxD-
Master
Slave
Terminating resistance
100
Ω
(1/2W)
Terminating resistance
100
Ω
(1/2W)
Shielded twist pair cable
RS-485 interface
or
RS-232C
(USB)
IR202
IR202
IR202
RS-485 side of
RS-485 converter
• SG does not have to be connected, but it can be used as an effective countermeasure
against communication errors due to noise.
• When using the micro controller in an area where the imposed noise level is expected to
exceed 500V, we recommend using a noise filter on the master side as seen in the figure
below.
We recommend RSHN-2003 (made by TDK Corporation) as a noise filter.
RS-485
IR202
Noise filter
Programmable controller
or
Personal computer
+ RS-232C to RS-485 converter
• If there are problems with EMC during communication, the noise level can be reduced by
using a communication cable with a ferrite core.
Ferrite core (recommended):
ZCAT series (made by TDK Corporation)
MSFC series (made by Morimiya Electric Co., Ltd.)
Содержание IR202
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