YASKAWA Z1000U Technical Manual page 332

C.1 BACnet Configuration
C.1 BACnet Configuration
The bypass system can be monitored and controlled by a controller on a Building Automation and Control network (BACnet)
using RS-485 technology and MS/TP (Master-Slave/Token-Passing) protocol. The bypass conforms to the BACnet application
specific controller (B-ASC) device profile. BACnet MS/TP connection is made to the bypass controller. Parameters and
monitors in both the drive and the bypass controller are made accessible from this one connection.
Up to 127 bypasses can communicate on a single BACnet MS/TP network. If more bypasses or BACnet devices are required,
then a BACnet router is required to allow another MS/TP network to be available with up to another 127 bypasses.
The BACnet node address is configurable by a parameter in the bypass. This defines the physical address of the bypass on the
MS/TP network. In addition, both the Device Object instance ID and the Device Object Name are configurable. These allow
the bypass to have a virtual address, and simplify the controller configuration.
Once the addressing is set, a controller can initiate communication to the bypass. The bypass will perform the specified function
and then send a response back to the controller. The bypass will usually respond immediately, but may delay its response until
it gets the token for commands that may take extra local processing time.
BACnet over Ethernet
Router Router
MS/TP MS/TP
BACnet
Workstation
Z1000U Z1000U Z1000U
Z1000U Z1000U Z1000U
Bypass Bypass Bypass Bypass Bypass Bypass
Figure C.1 Connecting Multiple Bypasses to a BACnet Workstation
332 YASKAWA SIEP YAIZ1D 01C Z1000U HVAC MATRIX Drive Bypass Technical Manual