Yaskawa Metasys N2 - Manual (Page 9)

u Wiring Diagram for Multiple Connections
Figure 3 explains the wiring diagrams for multiple connections using N2 communication.
n RS-485 Interface
CONTROLLER
1
2
3
4
+
-
SHLD
Bypass
Bypass
Controller
S1
OFF
TB3
SHLD
TXRX-
TXRX+
IG5
1
2
3
4
Bypass
Bypass
Controller
S1
OFF
TB3
SHLD
TXRX-
TXRX+
IG5
ON
1
2
3
4
Bypass
Bypass
Controller
S1
SHLD
TXRX-
TXRX+
IG5
Figure 3 RS-485 Interface
Note: Turn on DIP switch S1 on the bypass that is located at the end of the network. If S1 is missing, then an external 120 ohm resistor must be
placed across terminals TXRX+ and TXRX-. All other slave devices must have this DIP switch set to the OFF position (or if S1 is missing,
no external resistor must be used).
u Network Termination
The two ends of the network line must be terminated with a 120 ohm resistor between the TXRX+ and TXRX- signals. The
Z1000 Bypass has a built in termination resistor that can be enabled or disabled using DIP switch S1. If a bypass is located at
the end of a network line, enable the termination resistor by setting DIP switch S1 to the ON position. Disable the termination
resistor on all slaves that are not located at the network line end.
Note: Some bypass controllers do not have DIP switch S1. in such cases an external 120 ohm resistor must be placed across the
TXRX+ and TXRX- signals if the bypass controller is at the end of a network line.
3 Connecting to a Network
YASKAWA TOEP YAICOM 12A Z1000 Bypass Network Protocol Metasys ® N2 Technical Manual 9