6 connecting the n-42 to rs-422a – KEYENCE BL-700 Series User Manual
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Chapter 2 Connection and Installation
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2.3.6 Connecting the N-42 to RS-422A
RS-422 terminal block assignment
Connecting external equipment
■ Connecting N-42 to external unit
Use the same wiring when connecting the N-42 to the N-42.
•
Turn ON the terminators (BL-U1/external unit terminal resistance: 100 ).
➮ See P. viii.
•
The cable can be extended to within 1.2 km.
■ Connecting KV-L2*
Connecting the unit to RS-422A port 2
■ Connecting the MELSEC-A series
Connecting with AJ71C24,
AJ71C24-S
■
■
,
AJ71UC24,
A0J2-C214-S1,
A1SJ71(U)C24-R4
RS-422
SG SD+
RD+
SD–
RD–
SD +
SG
N-42
External unit
(N-42)
SD –
RD +
RD –
RD +
SG
RD –
SD +
SD –
Twisted pair cable
Code
Description
Signal direction
SG
Ground
—
SD+
Sends data to + terminal.
Output
SD-
Sends data to - terminal.
Output
RD+
Receives data from + terminal.
Input
RD-
Receives data from - terminal.
Input
SD+
SG
BL-U1*
SD–
RD+
RD–
RDB
SG
Link unit
RDA
SDB
SDA
Twisted pair cable
SD+
SG
BL-U1*
SD–
RD+
RD–
RDA
SG
Link unit
Twisted pair cable
RDB
SDA
SDB