KEYENCE BL-600 Series User Manual
Page 41
Chapter 3 Connection and Installation
31
3
3.2.4 Connecting the N-42 to RS-422A
RS-422 terminal block assignment
The terminals of the RS-422A terminal block of the N-42 are assigned as shown in
the figure.
■ RS-422 terminal block assignment
Note 1: The cable can be extended to within 1.2 km.
Note 2: Turn ON the terminators (BL-U1/external unit terminal resistance: 100
Ω).
Wiring the RS-422A
Connect the N-42 to other devices with the following wiring.
■ Connecting a general RS-422A unit
Use the same wiring when connecting the N-42 to the N-42.
RS-422
SG SD+
RD+
SD–
RD–
TERMINA
TOR
ON
OFF
POW
ER
SD
RD
READER
RS-422
terminal block
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TERMINA
TO
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ON
OFF
[ON]
SD +
SG
N-42
External unit
(N-42)
SD –
RD +
RD –
RD +
SG
RD –
SD +
SD –
Twisted pair cable