YOKOGAWA IR202, User Manual

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<2.CONNECTION>
2-1
IM 11G02Q02-01EN 2nd Edition : Sep. 04, 2020-00
2. CONNECTION
WARNING
Do not turn on the power supply until all wiring have been completed, otherwise electric shock or
malfunctions may occur.
n
RS-485 Interface
The terminal allocation of RS-485 (at the rear panel)
5 4 3 2
9 8 7 6
1
1: Signal ground
2: RTxD+
3: RTxD-
4 to 9: NC
9-pin D-Sub (female)
RS-485 interface requires
• Use a shielded twist pair cable. (Recommended cable: KPEV-SB (made by The Furukawa
Electric Co., Ltd.))
• The maximum cable length should be 500m. One master and up to thirty-one micro
controllers (slaves) can be connected per circuit.
• Terminate both ends of the circuit with a terminating resistance of 100Ω (1/2W or more).
• Ground the shielded cable once towards the master side