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YASKAWA
SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference
10.3
BACnet Communications
This section gives detailed information about the parameters, error codes, and communication procedures for BACnet
communications.
◆
Configure Master/Slave
You can monitor and control the bypasses from a controller on a Building Automation and Control network (BACnet)
with RS-485 technology and Master-Slave/Token-Passing (MS-TP) protocol. The drives agree with the device profile
of the BACnet Application Specific Controller (B-ASC).
A maximum of 127 bypasses can communicate on a single BACnet MS-TP network depending on network
conditions. When more bypasses or BACnet devices are necessary, a BACnet router is necessary to let another MS-
TP network be available with a possible maximum of another 127 bypasses.
You can use parameters to set the MSTP MAC address, MSTP baud rate, and Device Object ID. You can also use
parameters to set Device object properties Max Masters and Max Info Frames. Set other Device Object properties, for
example Device Object Name and Device Object Location, through the BACnet network after you connect the bypass
and the bypass is communicating.
When you set the addressing, a controller can start communication to the bypass. The bypass will do the specified
function and send a response back to the controller. The bypass will usually respond immediately, but can delay its
response until it gets the token for commands that can take longer local processing time.
A - BACnet over Ethernet
B - Router
C - MS-TP (RS-485)
D - Bypasses
E - BACnet Workstation
Figure 10.1 Connection Example of Multiple Bypasses to a BACnet Workstation
◆
Communication Specifications
lists the specifications for the BACnet communications.
E
D
A
B
B
C
D
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