YASKAWA Z1000U Technical Manual page 387

E.2 Connecting to a Network
u
Network Cable Connection
Follow the instructions below to connect the bypass to a MEMOBUS/Modbus network.
Note: Separate the communication cables from the main circuit cables and other wiring and power cables. Use shielded cables for the
communication cables and properly shielded clamps to prevent problems from electrical interference.
• With the power shut off, connect the communications cable to the bypass controller and the master. Use the terminal TB3
for MEMOBUS/Modbus.
• Check or set the termination resistor selection at all slaves.
Z1000U Bypasses.
• Apply power.
• Set parameters Z3-01 to Z3-11 needed for serial communications using the HOA keypad.
• Remove power and wait for the display on the HOA keypad to go blank.
• Reapply power.
• The bypass is now ready to begin communicating with the master.
YASKAWA SIEP YAIZ1D 01C Z1000U HVAC MATRIX Drive Bypass Technical Manual
Figure E.1 Serial Communications Cable Connection Terminal (TB3)
TB3
Shield
SHLD
4
3 Transmit/Receive (-)
TXRX-
2
TXRX+ Transmit/Receive (+)
1
Isolated Ground Reference
IG5
Refer to Network Termination on page 335
E.2 Connecting to a Network
for slaves that are
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