KEYENCE N-410 - Manual (Page 36)

2-14
Inst
allatio
n
2
2-3 Connecting and Wiring to the N-R4 Series
Terminal layout of RS-485
• The extended distance of the cable must not exceed 1.2 km.
• Set the terminating resistance switch (100W) of the N-R4 located at the end of the RS-
485 trunk line to ON.
• To use the multi-drop connection, the N-410 master unit must be used.
Wiring the RS-485 cable
Use a twisted pair cable for RS-485 connection.
Recommended RS-485 cable
 N-410 (Multi-drop communication)
• Up to 31 units N-R4 units can be connected to a single N-410.
• Limit the total extension of the RS-485 cables to 1.2 km.
• Do not supply power to the N-R4 from the 24 V DC OUT terminal of the N-410.
• Never use a terminal block connection at a midpoint of the RS-485 cable connection.
• Avoid branching of the RS-485 connection as shown in the figure below.
• Set the baud rate of RS-485 devices to 4800 bit/s or faster.
Symbol Description
Signal
direction
485+ RS-485 + side I/O
485  RS-485  side I/O
SG Signal ground 
485+
485 
SG
Unused
Note
Manufacturer: THE FURUKAWA ELECTRIC CO., LTD.
Product name: Instrumentation cable
Model: KPEV-SB (1P) 0.75 mm 2
485+
485–
SG
485+
485–
SG
485+
485–
SG
RS-485+
RS-485–
RS-485 SG
N-R4 N-R4 N-R4
N-410 *
Set the terminating resistance switches of the N-R4 and N-410 marked with * to ON.
Note
N-R4 N-R4 N-410
N-R4
N-R4* N-R4 N-410*
N-R4
(With a branch) (No branch)
Terminating resistance switch: ON