Owner's manual
Table Of Contents
- N-400 User's Manual
- Software License Agreement
- Safety Precautions
- Warnings and Cautions Specific to the N-400
- List of Package Contents
- Contents
- Chapter 1 Overview of the N-400
- Chapter 2 Installation Procedure
- Chapter 3 N-400 Setup Procedure
- Chapter 4 Multi-Drop Link Mode Control Procedure
- Chapter 5 Multi-Head Mode Control Procedure
- Chapter 6 PLC Link
- Appendices
- WARRANTIES AND DISCLAIMERS:
Chapter 2 Installation Procedure
25
2
2.4.5 Connecting RS-485
For the RS-485 connections, use the “SDA” and “SDB” terminals provided on the
terminal block.
Recommended RS-485 cable
• 0.75 mm
2
x 2 cores, shielded
• Up to thirty-one BL-U1 (BL series) units can be connected in multi-drop link
mode.
• The total extension length of the RS-485 cable must be within 1.2 km.
• Turn ON the equipment terminator (termination resistance: 100 Ω) at both ends
of the RS-485 connection (marked with * in the above diagram).
• Turn ON/OFF the BL-U1 terminator using the terminator switch. (See p. 22.)
• Turn ON/OFF the N-400 terminator using the terminator switch. (See p. 6.)
Note: Be sure not to connect the RS-485 cable using the terminal block.
Note 1: Do not place the RS-485 cable in the same conduit as a power cable.
Note 2: Do not branch the RS-485 connection as shown below.
SDA
BL-U1 BL-U1 BL-U1
* N-400
SDB
SG
SDA
SDB
SG
SDA
SDB
SG
RS-485 +
RS-485 –
RS-485 SG
*
Incorrect Correct
BL-U1
BL-U1
BL-U1 BL-U1
BL-U1
BL-U1BL-U1
BL-U1
N-400 N-400
*
*
* Terminator ON
Incorrect
(Connection with branch)
Correct
(Connection without branch)